POLYCLAD FLATWORMS — HYMAN 569 



The small differences mentioned above do not seem adequate 

 grounds for separating the present specimen from Kato's species. 

 Pseudoceros izuensis shows considerable resemblance in color pattern 

 to P. viridis (Kelaart) (1858), Ceylon, which according to the descrip- 

 tion and colored figure in Collingwood (1876) also is green with brown 

 tentacles, a brown middorsal stripe, and a brown streaky margin; 

 but the dorsal surface is splotched with brown rather than dotted 

 with black. Contrary to Lang (1884, p. 567), I think viridis 

 (Schmarda) (1859) is not identical with viridis (Kelaart) as the color 

 patterns of the two species appear somewhat different. It therefore 

 is necessary to rename Schmarda's species, and I propose virescens. 



Pseudoceros habroptiliis, new species 



Figure 8 



Material: One specimen taken by the Templeton Crocker Expe- 

 dition, No. 1014, June 5, 1933, at Vanikoro Island, in the Solomons. 



General characters: The worm was badly crumpled and the 

 posterior part could not be straightened. After flattening as much as 

 possible the worm appeared as in figure 8. It measures 10 by 6 mm. 

 and is probably of elongated oval form. At the anterior end appear 

 the usual tentacidar upfolds of which one is well preserved while 

 the other is contracted and distorted. The tentacular eyes were 

 poorly discernible; the single oval cerebral cluster is shown in the 

 figure. The black-and-white color pattern is pretty and distinctive. 

 The worm is white with a narrow, very black border that also edges 

 the tentacular folds. Paralleling the margin is a wider band of grayish 

 black hue and centrally there is a paired band of similar width and 

 color. The two median bands converge anteriorly and fuse just behind 

 the cerebral eyes. The black bands could not be followed posteriorly 

 because of damage and crumpling here but the black margin obvi- 

 ously encircles the entire worm. The pharynx had probably been shed 

 as rupture was evident ventrally at the appropriate place. The sucker 

 was not clearly evident and is shown conjecturally in figure 8. The 

 worm is juvenile without any traces of the reproductive system. 



Differential diagnosis: The color pattern is sufficiently distinc- 

 tive. 



Holotype: USNM 28652, the worm mounted whole. 



Pseudoceros caeruleocinctus, new species 



Figure 9a 



Material: The single specimen was taken by the Stanford team 

 at the Palau Islands, Sta. 77, Aug. 10, 1955, crawling on clean sand 

 in a shallow bay on the south shore of Auluptagel Island. 



