412 J. STAFFORt), 



in number and arrangenient as I liave shown to occur in Aspido 

 gnster'^). Gastaldi must have seeu the cilia of the funnels for he 

 nientions ciliated canals, and, as far as I can make out, tliere are no 

 cilia on the inner walls of the tubes themselves. The funnels appear 

 to be numerous and are tolerably easily found for such organs. 



The cuticle, especially of the anterior part of the animal, con- 

 tains minute spines and there is also a double row of these round the 

 opening of the ventral sucker. 



A bunch of cells, distinct frora the parenchyma, lies between the 

 ends of the intestine and the confluence of the expulsion canals. This 

 is doubtless the rudiinent of the genital glands. 



Where this worm reaches maturity is not knowu. One can imagine 

 such a bird as a hawk eating the flesh of a frog and with it some 

 of these worras; in its intestine, perhaps, they reach maturity and 

 discharge their eggs, which may be voided with its faeces round 

 ponds; the miracidia may creep into snails or insect larvae or 

 crustaceans that fall prey to the frog. 



5. Aniphistoniuni subclavatum Rud. 



This Trematode I have found, on several occasions, in the rectum 

 of frogs — chiefly of the small grass frogs. It is easily distinguished 

 fiom the other species on account of its broad ventral sucker, which 

 in this worm is at the posterior end of the body, and its conical form 

 tapering into the small anterior mouth-sucker. 



It is illustrated in Pagenstecher's "Trematodenlarven und Trema- 

 toden", Heidelberg 1857. See also Looss, Ueber Amphistomum sub- 

 clavatum und seine Entwicklung, in : Festschr. Leuckart, Leipzig 1892. 



6, Distomum medians Olsson. 



It is only quite lately that two individuals of the species I thus 

 provisionally designate have fallen in my way. Notwithstanding a dif- 

 ference of habitat and numerous minor differences in form and Organi- 

 zation yet on the whole the dispositions of the organs are the same 

 as in the D. medians figured and described in "Die Distomen unserer 

 Fische und Frösche" by Looss. 



My specimens I took from the liver of a bull-frog (Bana cates- 

 hiana). Eacli was in au elliptically shaped capsule, lying immediately 

 under the surfacc of the liver and showing through. The capsules 

 were thick wahed and composed of a very tough connective-tissue 



1) For Aspidogaster see Zool. Jahrb., 1896, V. 9, Anat., pp. 477 

 —542, tab. 1—4, p. 510. 



