POLYCLAD FLATWORMS — ^HYMAN 573 



life. The form is an elongated oval (fig. 9d). The tentacular upfold- 

 ings are well preserved. Beliind them is seen the small, compact 

 ruffled pharynx of a few folds, and directly behind this occurs the 

 single male gonopore, followed by the female pore. The sucker is 

 situated somewhat posterior to the middle of the worm. Despite 

 its small size the worm was fully mature and laid a small globular 

 egg mass during the night in the jar in which it had been placed. 

 The color is a uniform very dark grayish black, or practically black, 

 mthout any markings. Because of the black color, eyes could not be 

 seen. 



Differential diagnosis : There does not seem to be any previouslj^ 

 described species of Pseudoceros that is small and uniformly of a dull 

 black coloration. Pseudoceros velutinus (Blanchard) (1847) is uni- 

 formly black but the black is of a velvety texture and tinged with 

 blue or violet; this species is further quite large, being still not fully 

 mature at a length of 50 mm. Pseudoceros bajae Hyman (1953a) 

 is also quite large, with a pair of male apparatuses. 



Holotype: USNM 28655, in alcohol. 



Pseudoceros fulvogriseus, new species 



Figure 10a,b 



Material: One specimen was taken by the Stanford team in 

 Geruherugairu Pass, Iwayama Bay, Palau Islands, Sta. 85, Aug. 12, 

 1955. 



General characters: The worm is a large, elongated species, 

 50 mm. long, preserved, 20 mm. across the widest part. The exten- 

 sive ruffling of the margins indicates a much greater length when 

 crawling, extended. The worm appears widest across the middle 

 and tapei-s from this to the rounded anterior end, with tjrpical tentac- 

 ular foldings, and posteriorly to the pointed tail (fig. 10a). The shape 

 is unusually elongated for the genus. An enlarged view of the tentac- 

 ular foldings is shown in figure 106, which also gives the eye distribu- 

 tion. Shortly behind the tentacles is found the group of cerebral 

 eyes, forming a single large rounded cluster. Behind the cerebral eye 

 cluster is seen the compact ruffled pharynx, surprisingly small for the 

 size of the worm. Posterior to the pharynx are the two male pores, 

 unusually close together, located 10 mm. from the anterior end. 

 They are followed by the female pore, 13 mm. from the anterior end. 

 The sucker is located at about the middle, 25 mm. from the anterior 

 end. The worm appeared in breeding condition for the branched, 

 anastomosing uterus (shown on one side only in figure lOo) was very 

 evident in the cleared specimen. 



