2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



enters the oval prostate vesicle, which is smaller than the seminal 

 vesicle. This has a moderately thick muscular wall of fibers parallel 

 to the surface contour, penetrated by the ducts of the extracapsular 

 prostate glands. Ejaculatory duct projects into prostate vesicle for 

 about three-fourths the length of the latter. No penis papilla. A 

 relatively short stylet springs directly from the prostate vesicle ; it 

 lies in a moderately long tubular male antrum which curves grace- 

 fully ventrally and posteriorly to the male genital pore. Male antrum 

 with a muscular wall of inner longitudinal and outer circular fibers. 

 Female pore shortly behind male pore ; canal leading in from surface 

 probably artificial caused by straightening of the specimen. Vagina 

 of moderate width with coating of circular muscle fibers ; curves pos- 

 teriorly and widens where it receives the uteri ; beyond this, wide stalk 

 of Lang's vesicle curves down, then posteriorly, and opens into the 

 very long large Lang's vesicle. 



Remarks. — Noto plana insular is does not closely resemble any of 

 the known species from adjacent islands of the Caribbean and West 

 Indies, but seems more nearly related to N. stylifcra from Juan Fer- 

 nandez, from which, however, it differs in several details, which will 

 be apparent on comparison of my figures with those of Bock. 



Differential diagnosis. — Tentacular and cerebral eyes in one band, 

 cerebral eyes of same size as tentacular eyes, seminal vesicle larger 

 than prostate vesicle, no penis papilla or penis sheath, penis stylet 

 short, male antrum tubular, vagina widened at entrance of uteri. 



Locality. — Shores, Old Providence Island. Collected by Dr. Waldo 

 L. Schmitt, August 6, 1938. 



Holotype. — Anterior half as whole mount ; posterior half as sagit- 

 tal serial sections, U.S.N.M. no. 20423. 



NOTOPLANA CARIBBEANA, n. sp. 



Figs. 4-8 



Description. — One large specimen, 33 mm. long, 13 mm. wide at 

 widest part, of elongated wedge form, widest anteriorly, tapering 

 gradually to obtuse posterior end (fig. 4). Color not determinable. 

 Eyes in paired bands in which the tentacular clusters are included 

 (fig. 5). Some indications of tentacles in center of tentacular eye 

 clusters ; tentacular eyes obviously larger than cerebral eyes ; cerebral 

 eyes small, forming elongated group anterior to tentacular group and 

 few scattered eyes behind tentacular group. Pharynx long, very nar- 

 row, with many small folds, embraced by uteri which come to a point 

 in front of pharynx (fig. 4). Sexual region removed and cut into 



