4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



noticed between the two species. In A T . caribbeana the cerebral eyes 

 are much smaller than the tentacular eyes and on the same level, 

 whereas in N. binoculata they are of nearly the same size as the ten- 

 tacular eyes and so deeply buried that they were overlooked alto- 

 gether by Verrill (whence the name binoculata) . The seminal vesicle 

 of JV. caribbeana is much larger and thinner walled than that of 

 JV. binoculata, its male canal is longer and the male antrum is of dif- 

 ferent shape and lacks the two hillocks found in JV. binoculata to 

 which I have called attention. The female apparatus of the two species 

 is very similar, but in JV. caribbeana the vagina and stalk of Lang's 

 vesicle appear to be longer than in JV. binoculata (although these differ- 

 ences may depend simply on the size of the specimen) and the cement 

 glands extend farther along the female apparatus than in JV. binocu- 

 lata. These differences seem to justify the separation of the forms 

 as distinct species. Bock has placed JV. binoculata in his group B, 

 typified by JV. atomata, but admits that it is not closely related to the 

 members of this group. I suggest that JV. binoculata and JV. caribbeana 

 be considered to constitute a separate group of the large genus 

 N otoplana, characterized by the long male canal and the large 

 extremely muscular male antrum. 



Differential diagnosis. — N. caribbeana differs from other Notoplanas 

 except A T . binoculata in the long slender male canal, large male antrum 

 with an anterior extension, and excessive muscularity of the anterior 

 wall of the male antrum, whose muscle fibers fill all the space between 

 antrum and seminal vesicle. Differences from JV. binoculata are 

 listed above. 



Locality. — Shores of Old Providence Island. Collected by Dr. 

 Waldo L. Schmitt, August i, 1938. 



Holotype. — Whole mount with sexual region removed; set of 

 sagittal sections of sexual region, U.S.N.M. no. 20424. 



EUPLANA CLIPPERTONI, n. sp. 



Figs. 9-12 



Description. — Two specimens, larger 17 mm. long, 7 mm. wide 

 across widest part, not quite fully mature sexually, elongated, widest 

 at about the level of the brain, tapering posteriorly, much folded and 

 contracted, evidently much longer and more slender in life (fig. 9). 

 Smaller specimen very young, 6.5 mm. in length, obovate, with no 

 trace of sex organs. Color not determinable. With evident tentacular 

 groups of eyes, consisting of 3 large eyes and 4-6 smaller ones 

 (fig. 10). Cerebral eyes loosely arranged, scattered, radiating in a 



