PHILIPPINE POLYCLAD TURBELLARIANS. 641 



same color occurred a submarginal band of orpigment orange, which 

 was interrupted at the extreme anterior end only. An elevated 

 papilla, which was about 2 mm. high and presented a basal ring 

 of orpigment orange and a black tip, was located a little to the left of 

 the tentacle of the same side and just inside the submarginal orange 

 band above mentioned. The ventral surface was of a somewhat paler 

 color than the dorsal and presented a median line of smoky gray. 



Numerous small eyespots are scattered over each tentacular fold, 

 and they also occur over the brain in a group which is faintly 

 divisible into two clusters. 



The mouth opens nearly between the anterior and the middle third 

 of the body, leading into the pharyngeal cavity with the pharynx 

 plicated. The ventral sucker occurs slightly in front of the com- 

 mencement of the posterior third of the body. 



Unfortunately the genital organs were not developed in the speci- 

 men examined. 



As with the present specimen, most of the examples examined by 

 Bock are of a uniform brown color and are marked by two distinct 

 narrow marginal stripes, the inner chrome yellow and the outer black, 

 though some presenting, besides these, a narrow rim of a paler color. 

 Under this circumstance I feel it advisable to refer the present ex- 

 ample to Bock's Pseudoceros litoralis. 



So far as concerns the coloration, the present specimen appears 

 to be very closely allied to Pseudoceros superbus Lang which is 

 known to occur in the Mediterranean and also in the Pacific, off the 

 Galapagos Islands. According to Bock, however, it differs from this 

 in having only a single penis. 



5. PSEUDOCEROS BUSKII (CoUingwood). 



Plate 1, fig. 5. 



Proceros buskii Collingwood, 1876, Trans. Linn. Soc, ser. 2, Zool., 



vol. 1, p. 91. 

 Pseudoceros buskii Lang, 1884, Naples Monogr., p. 547. — Laidlaw, 1902, 



Fau. & Geogr. Maldive & Laccadive Archip., vol. 1, pt. 3, p. 298. 



In the collection was a single individual of a species which is per- 

 haps identical with Collingwood's Proceros buskii from Singapore. 

 It was found on the reef in Cataingan Bay, Masbate, in April. 



The body in the living state was of an elongate-oval shape with 

 the margin very strongly frilled. The tentacles appeared as two 

 short folds of the frontal margin of the body. In the expanded 

 state the specimen had a total length of 50 mm. and a breadth of 

 20 mm. 



Dorsally the body was bordered all around by a narrow marginal 

 band of citron yellow, immediately interior to which was a broad 

 purplish-black band, gradually grading inward into a cream 

 60277—23 2 



