1932年1月,劉承釗經博愛理的推薦,獲得美國洛克菲勒基金會的資助,到美國康奈爾大學研究生院深造。7月,到達位於美國東部紐約州伊薩卡的康奈爾大學,師從Albert H. 芮特(Wright)教授主攻兩棲爬行動物學。曾利用假期到芝加哥等地博物館查看標本。
1934年春,劉承釗從美國康奈爾大學畢業,獲得哲學博士學位。他的畢業論文題目是“中國無尾兩棲類的第二性徵(Secondary Sex Characters of Chinese Salientia)”,被刊印入該校學位論文集,榮獲科學和教育兩項金鑰匙獎勵,被選為Sigma-Xi自然科學榮譽學會會員。畢業後,劉承釗到華盛頓等地參觀考察,然後取道歐洲,去英、法、德、意、奧地利等國博物館查看藏於該處的中國標本,尤其是一些模式標本。同年9月4日,回到中國,從上海轉蘇州東吳大學執教,擔任生物系教授,兼任淡水生物研究所所長,並繼續從事兩棲爬行動物研究。
1Liu Cheng-chao.“The Linez Masculina”,a new secondary sex character in Salientia.Journ Morphol,1935,57(1):131—135.
2Liu Cheng-chao.Types of vocal sac in the Salientia.Proc Boston Soc Nat Hist,1935,41(3):19—40
3Liu Cheng-chao.Rana boulengeri with a discussion of the allied speciesin China.Peking Nat Hist Bull,1935,10(1):55—60.
4Liu Cheng-chao.Secondary sex characters of Chinese frogs and toads.Field Mus.Nat Hist,zool ser,1936,22(2):115—156.
5Liu Cheng-chao.Life history of Trimeresurus jerdonii.Peking Nat Hist Bull,1940,14(4):245—252.
6Liu cheng-chao.Adaptation in tadpoles and adu1ts,No.1 of Natura1 History Studies of West China Amphibia.Peking Nat Hist Bull,1940, 15(2):161—174.
7Liu Cheng-chao.Life history of Rhacoporus davidi(Sauvage),No.2 of Natural History Studies of West China Amphibia.Peking Nat Hist Bull,1940,15(3):243—251.
8Liu Cheng-chao.Life history of Rana boulengeri,No.3 of Natural History Studies of West China Amphibia.Peking Nat Hist Bull,1940,15 (3):253—259.
9Liu Cheng-chao.Life history of Rana adenopleura(Ranamusica?),No.4 of Natural History Studies of West Chinab Amphibia.Peking Nat Hist Bull,1940,15(4):285—290.
10Liu Cheng-chao.Life history of Staurois chunganensis,No.5 of Natural History Studies of West China Amphibia.Peking Nat Hist Bull,1940, 15(4):291—295.
11Liu Cheng-chao.Tadpoles of West China Salientia.Journ.W.China Bord Res Soc,1940,12(B):7—62.
12Liu Cheng-chao.Two new scutigers from Chao-chiao-hsien,Sikang.Journ W.China Bord Res Soc,1943,14(B):35—38.
13Liu Cheng-chao.Life history of Kaloula rugifera.No.6 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1943,14(B):39—42.
14Liu Cheng-chao.Life history of Rhacophorus leucomystax.No.7 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1943,14(B):43—50.
15Liu Cheng-chao.Life history of Scutiger sikkimensis with a discussion of its allied species in China.No.8 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1943,14(B):51—78.
16Liu Cheng-chao.Life history of Batrachu peruspinchonii(David).No.9 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1945,15(B):44—55.
17Liu Cheng-chao.Life history of Bombina maxima(Boulenger).No.10 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1945,15(B):56—60.
18Liu Cheng-chao.Life history of Kaloula macroptica Liu.No.11 of Natural History Studies of West China Amphibia. Journ W China Bord ResSoc,1945,15(B):61—64.
19Liu Cheng-chao.Life history of Rhacophorus hui Liu.No.12 of Natural History Studies of West China Amphibia.Journ W China Bord Res Soc,1945,15(B):65—69.
20Liu Cheng-chao.New frog from West China.Journ W China Bord Res Soc.1945,15(B):28—43.
21Liu Cheng-chao.A new wood frog Ranachao chiaoensis,with a discussion of its allied species from West China.Journ W China Bord Res Soc,1946,16(B):7—14.
22Liu Cheng-chao.A mphibians of Western China.Fieldiana:Zool Mem,1950,2:1—400.