640 BULLETIN 101), UNITED STATES NATIONAL MUSEUM. 



around by a narrow light-gray band; just inside this was a second 

 one of similar width of Chinese orange. The tentacular lobes were 

 colored like the general surface, but lacked the sub-marginal band of 

 Chinese orange. The ventral surface was of a much lighter color 

 than the dorsal. Along the median line was a pearl-gray streak 

 which extended posteriorly from near the anterior margin of the 

 body. 



Numerous small eyespots, though difficult to detect owing to a 

 poor state of preservation, appear to be distributed on the tentacular 

 folds in two distinct clusters; and an oval elongated group of eyes, 

 divisible into two closely approximated clusters, occurs dorsal to 

 the brain. 



Situated near the beginning of the middle third of the body 

 is the mouth, which leads into the pharyngeal cavity with the 

 plicated pharynx. The ventral sucker occurs slightly behind the 

 middle of the body. 



Instead of strongly folded, S-shapecl lobes, the tentacles in Col- 

 lingwoqd's form are in his figure shown as a pair of long promi- 

 nent processes. Excepting such a difference, it is difficult to find 

 any distinguishing character. 



Laidlaw, 3 although harboring some suspicion, puts on record a 

 form from Pulau Biclan, a little north of Penang, which is perhaps 

 referable to the present species. 



The present form is almost exactly similar in color to Stimpson's 

 CaUioplana marginata* an Acotylid species from Japan, but is be- 

 yond doubt distinguished from it by the presence of marginal, in- 

 stead of nuchal, tentacles. 



4. PSEUDOCEROS LITORALIS Bock. 



Plate 1, fig. 4. 

 Pseudoeeros litoralis Bock, 1913, Zool. Bid. f. Uppsala, vol. 2. p. 259. 



The collection contained one specimen, which I have identified as 

 Pseudoeeros litoralis Bock, a species from the Gulf of Siam. It was 

 found on coral sand and shell bottom at a depth of 21 fathoms off 

 Sulade Island, Sulu Archipelago. 



The body in life was thin leaflike in shape and of a sinuous out- 

 line. The anterior margin was elevated and folded in two S-shaped 

 loops of tentacular folds, while the posterior was evenly rounded. 

 The fully extended animal measured 20 mm. in length and 14 mm. in 

 breadth. 



The dorsal surface was of a uniform velvety dark-brown color 

 with a touch of purple. Just inside the extreme margin of the 



s Laidlaw, 1903, Proc. Zool. Soc. London, vol. t, p. 315. 



« Yeri and Kaburaki, 1918, Journ. Sci. Coll. Imp. Univ. Tokyo, vol. 39. art. 9, p. 32. 



