DE. T. S. COBBOLD ON TEICHIKA SPIEALIS. 205 



specimens preserved in this country, I tliink he will arrive at the 

 conviction which I have expressed at the outset of this paper. It 

 is a comparatively easy task to name afresh every entozoon which 

 happens to come into one's possession ; but to ascertain how often 

 it has previously been described may involve a good deal of 

 labour. As an illustration of the truth of the latter remark, I 

 subjoin a list of the synonyms which I believe to belong to the 

 species under consideration: — Distoma clavatum, E-udolphi=Z>. 

 CoryphcBncB, E.ud. = Z>. gigas, Na,Tdo = Fasciola clavafa, Menzies 

 = F. CorypTicence, Bosc = -F. Coryph. Sippuridis and F. Scombri 

 Pelamidis, T'Ae^\Vi&=-F.fusca, Jiosc= Sirudmella onarina, Garsin 

 =S. clavata, Baird. 



Probably we may here also include Eudolphi's Distoma tornatum ; 

 but I have never seen the caudal extremity of D. clavatum pro- 

 jected to the extent described by Dujardin as occurring in _D. tor- 

 natum, though I think it quite capable of becoming so. Diesing, 

 in my view, gives this accidental invaginating process too much 

 prominence as a specific character when he writes, in regard to 

 D. tornatum, " Cauda longissima, gracilescente, moniliformi," 

 overlooking the circumstance that the tail is normally truncated 

 posteriorly. Whether the correctness of my opinions respecting 

 the synonymy of D. clavatum be admitted or not, I am confident, 

 as regards certain other reputedly distinct forms of this genus 

 and its allies, that they have had a common origin. On this 

 score I may adduce evidence on some future occasion. 



Experiments with Trichina spiralis. By T. Spe^^cee Cobeold, 

 M.D., !P.E,.S., E.L.S., Lecturer on Comparative Anatomy at 

 the Middlesex Hospital. 



[Read Janiiary 17, 1867.] 



The present record may be regarded as a sequel to my paper on 

 ' Experiments with the Cestoid Entozoa ' recently submitted to 

 the Society. In conducting these investigations, I have received 

 the friendly cooperation of Professor Simonds, and of Assistant 

 Professor Pritchard, of the Eoyal Veterinary College. 



Exps. 1 and 2. On the 15th March, 1865, an ounce of flesh 

 containing Trichinse was administered to a small black bitch. The 

 dog was destroyed five days subsequently ; but neither intestinal 

 nor muscle-trichinse were discovered. It was thought that the 

 dog had thrown up the bolus, which was strongly saturated with 



