NOTICES BIOGRAPHIQUES. — JOSEPH LEIDY 277 



the studies made on this were communicated to the world mostly 

 in the form of brief articles rather than finished contributions. 

 Nevertheless, his keen insight into comparative anatomy led him 

 to outline many natural gênera, siich as Clmostomum, to which 

 the newer génération of students are jiist returning as natural 

 subdivisions. While thèse observations were made with great 

 keenness oi perception, it must still be confessed that they were 

 often expressed in quite too brief form for clear gênerai under- 

 standing. In this he only followed the plan of his Europeancontem- 

 poraries and while his ideas are distinct witli the spécimen itself 

 in view, it is undoubtedly true, as in the case of many other great 

 workers of the past génération, that the original spécimens must 

 be worked over more fully to establish their actual taxonoraic 

 position. It is sad to record that his helminthological work was 

 left unfinished. In the five volumes oi Leidyana (1) presented to 

 the Philadelphia Academy by Dr. Nolan are included four volumes 

 of drawings and notes which are a véritable mine of helmintho- 

 logical information. An unfinished monograph of the Gregarines 

 is indicated by the 176 unpublished illustrations of thèse forms 

 from twenty-one hosts which occur among thèse dravings ; and 

 the wide range of other helminthological work shows well that 

 his Project of a monograph on parasites would hâve given the 

 world a work the loss of which we may well mourn. But though 

 unfmished his contributions will form the basis of American 

 work in the future as they bave f urnished in s^me directions even 

 to the world the foundation for past work in this department. 

 Leidy's réputation as a helminthologist was certainly cosmopoli- 

 tan as is clearly evinced by the numerous références to his contri- 

 butions in the works of Gobbold, Diesing, and of that master of 

 helminthology, Rudolph Leuckart. 



PARASITOLOGICAL PUBLICATIONS OF PROFESSOR J. LEIDY 



MiSCELLANEA. 



1853. A flora and fauna within living animais. Smithsonian Contri- 

 butions to knowledge; Washington, in-4° de 67 p. et 10 pi. 



(1) A Mémorial of Dr. Joseph Leidy. Proceed. Acad. oj nai. îtc. P/iiladolphia, 

 1898, p. 465-467. 



