RESEARCHES IN HELMINTHOLOGY AND 

 PARASITOLOGY 



BY JOSEPH LEIDY, M. D., LL. D. 



BIBLIOGRAPHY OF HIS CONTRIBUTIONS TO SCIENCE 



ARRANGED AND EDITED BY JOSEPH LEIDY, Jr., M. D. 



[September, 1846. No. 9. See Bibliography.] 



DESCRIPTION OF A NEW GENUS AND SPECIES OF ENTOZOA.* 



In the course of an investigation of the anatomical structure 

 of the terrestrial gasteropoda of the United States, I discovered a 

 microscopic entozoon inhabiting the fluid contained in the ves.sie 

 copulatrice or spermatheca of Helix albolabris, since which I have 

 found it to exist in two other species, Helix tridentata and Helix 

 alternata, and I have no doubt of its existence in others, not yet 

 having had an opportunity of examining further. As there appears 

 to be no known genus in which this animal can be placed, I have 

 been necessitated to form the following : 



Cryplobia.\ — Animal minute ; form exceedingly proteoid ; inter- 

 nal organization cellular or granular. 



C. helicis. — Colourless ; form ordinarily elongate, ellipsoid, fusi- 

 form, or ovate ; caudated, caudse opposite, one longer than the other. 

 Internal granular structure consisting of two large cells and numerous 

 minute granules. Total length from the 125th to the 1 00th of a 

 line. Habitat, the vessie copulatrice or spermatheca of Helix albo- 

 labris, Helix tridetitata, and Helix alternata. 



The name of this genus is derived from h'f>u-T<)<-, hidden, and /?;./«, 

 to live. This singular entozoon in its general appearance and or- 



* When not otherwise specified the extract is taken from the Proceedings of 

 the Academy of Natural Sciences, Philadelphia. 

 tSee Proc. Acad. Nat. vSci., Vol. Ill, August, 1847. 



