238 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



fields that are distinct, but dovetail to some extent. In one of the 

 preparations one of the transverse coils of the ascending limb lies on 

 the opposite side, among the coils of the descending limb. As the 

 uterus enters the testicular zone its coils fill the area between the 

 testes, encroaching to some extent on the testicular fields; then it 

 ascends laterally of the mesial aspect of the ovary to assume a more 

 simple course cephalad of the latter and dorsally of the cirrus sac to 

 discharge finally into the genital atrium. 



The Aatellaria, consisting of a moderate number of groups of a 

 well-developed follicles, are situated ventro-laterally of the intestinal 

 ceca in a zone the cephalic limit of which is a plane slightly caudad 

 of the cephalic margin of the acetabulum and the caudal limit, the 

 plane of the caudal margin of the caudal testis. In one of the prep- 

 arations the grouping of the follicles is very clearly evident; each 

 gland in this specimen appears to be made up of nine groups. A 

 duct leaves each group of follicles; these ducts unite to form one or 

 two secondary yolk ducts that leave each gland to pass toward the 

 axial region dorsally of the gut. When two ducts leave the gland 

 they unite later to form a single transverse vitelloduct. The trans- 

 verse duct of one side unites with its fellow of the other side close 

 to the ventro-caudal aspect of the shell gland to form a common 

 duct. The common duct passes cephalo-dorsad into the shell gland 

 to unite with the oviduct as already described (fig. 3). 



Excretory system. — The excretory bladder is roomy and is in 

 the form of a Y. The lateral stems are short; beginning at about 

 the level of the cephalic margin of the globular cecal end of Laurer's 

 canal they unite at the level of its caudal margin to form the median 

 stem. This passes caudad in the intercecal area dorsally of the 

 folds of the uterus and between the testes to near the caudal mar- 

 gin, terminating by a short duct that discharges on the dorsal sur- 

 face at a point slightly removed from the caudal margin. 



SYSTEMATIC POSITION. 



From the foregoing description it will be seen that in the topo- 

 graphic relations of its organs this worm conforms to the diagnosis 

 of the genus StypModora Looss. 1 I therefore place this worm in 

 this genus under the name of StypModora bascaniensis. It stands 

 close to StypModora solitaria Looss, from which, however, it differs 

 in several respects most notably in that Laurer's canal instead of 

 opening on the dorsum terminates blindly. This peculiarity of 

 Laurer's canal has heretofore been noted, so far as I am aware, only 

 in one other trematode, namely, Aspidogaster conchicola. 



The specific diagnosis of Styphlodora bascaniensis may be sum- 

 .marized as follows: 



' 1902, p. 507. 



