24 BEV. T, A. MARSHALL — CORYNODINOEUM RECENSIO. 



Coeuurus in the liver of a cat. Numan says the Ccenurus (" De 

 Vee-arts wil den VeelJcop gevonden liebben"), by wbicb expression, 

 as also by others elsewhere given, I conclude that the existence 

 of a second, specifically distinct form of Ccenurus never once 

 entered his mind. Be that as it may, he has done full justice to 

 Mr. Rose and other English writers who have investigated the 

 structure and economy of the hydatids and their allies. 



From a microscopic examination of the specimens of the 

 Coenuri from the Squirrel, it would seem that these last un- 

 described polycephalous bladder-worms represent a kind of inter- 

 mediate type between the ordinary brain- Ccenurus and Echino- 

 coccus properly so called. At all events, in place of separate 

 heads (scoleces) in groups irregularly massed together as in 

 Ccenurus, I find bundles of heads, so to speak, forming small 

 nodides, which are often arranged in a linear manner. There 

 is, on the other hand, no evidence of a true brood-capsule, such as 

 we find in EcMnococcus ; but the formation of daughter vesicles, 

 by the exogenous method of budding, reminds one of the ordinary 

 mode of development seen in the hydatids derived from Tcenia 

 echinococcus. There are some other minute points, on which I 

 am not at present prepared to dwell ; these may reasonably stand 

 over for future investigation. The 

 little drawing, of which the woodcut 

 is a copy, lent by Mr. Eose, and re- 

 presenting his Ccenurus (called G. cu- 

 niculi in his MS., but not so named 

 in his published papers), is not unlike 

 some of the Coenuri from the Ame- 

 rican Squirrel, and it is not impro- 

 bable that it may represent the larval a moderate-si.ed o<.,™«. c^o^i, 

 condition of one and the same Taenia. "^^J^ daughter vesicles proliferating 



externally. — EOSE. 



What species of Taenia this may 



happen to be I do not care to conjecture, but I think it may be 



safely affirmed that it is not the. Taenia ccenwrus of authors. 



CoRTNODiKOEUM Eecensio. By the Eev. T. A. Marshall. 

 Communicated by the Eev. Hamlet Claek, F.L.S. 

 [Eead April 21, 1864.] 

 The following pages are the result of much investigation as to 

 the published works of authors, and several weeks of careful ex- 

 amination as regards the material at my disposal. I propose in 



