144 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



spherical muscular bodies with a small central lumen from which 

 the duct leads to the penis papilla. One of the vesicles is situated 

 below the anterior part of the seminal vesicle, the other between this 

 and the penis papilla. The seminal vesicle is of long oval shape 

 with a thick muscular wall that receives the two sperm ducts sepa- 

 rately into its ventral wall at about its middle. From the ante- 

 rior narrowed end of the seminal vesicle the sinuous ejaculatory 

 duct proceeds into the penis papilla. The female apparatus lies 

 close behind the posterior blind end of the seminal vesicle. The 

 female gonopore leads into a pouchlike female antrum from which 

 the vagina ascends, presenting immediately a pouchlike expansion 

 and then narro\\ang to a short duct receiving the uteri. The sucker 

 is a very large pouch, larger than the female apparatus, and lies 

 shortly behind the latter, slightly closer to it than the distance be- 

 tween the two gonopores (fig. 89, a). 



Distribution: West Indies. The type specimen came from 

 Andros Island, in the Bahamas. The present specimens were collected 

 by W. L. Schmitt on the Smithsonian-Hartford Expedition. Three 

 came from the eastern shore of the harbor at Charlotte Amalie, 

 St. Thomas, Virgin Islands, Apr. 4, 1937; one from a coral reef at St. 

 Croix, Virgin Islands, Apr. 8, 1937; and the fifth from the shore at 

 Banana Bay, Water Island, St. Thomas, Virgin Islands. The species 

 appears common in the West Indies. 



Specimens: Three whole specimens on two slides and one set of 

 sagittal sections of the sexual region (one slide) have been returned to 

 the U. S. National Museum. 



Genus Prosthiostomum, juvenile 



Figure 89,6 



Remarks: In the material from the Smithsonian-Hartford Expedi- 

 tion there was found a very small juvenile specimen of a Prosthiosto- 

 mum that did not seem to belong to P. pulchrum. The eyes of this 

 specimen are shown in figure 89, &. The number of eyes is not significant 

 as the eyes increase with age, but the large size of the marginal eyes in 

 comparison with the cerebral eyes and the division of the marginal eyes 

 into two groups by a median gap indicate that the worm belongs to 

 some other species than pulchrum. The specimen also does not fit into 

 the other species of Prosthiostomum known from the West Indies, 

 P. angustum Bock, 1913. There is considerable resemblance as to eye 

 arrangement with P. lohatum Pearse, 1938, from Florida. The speci- 



