CEPHALOPODS OF THE PHILIPPINE ISLANDS 25 



united along their bases by a low fleshy ridge. The lappets originate 

 at the base of the arms and extend outward to near the tip; there are 

 about eight on the dorsal arms of the holotype and six on each of the 

 other arms, with a few of those on III fused together. All five speci- 

 mens are distinctly so formed, though varying slightly in the number 

 of lappets. IV possesses the typical broad, well-developed smooth 

 ventral keel. The suckers are in four rows on all arms and are bor- 

 dered by weU-developed protective membranes. The sucker rings 

 are toothed on the whole margin, the teeth being very numerous 

 and square-tipped; those on distal half are long, slender, and 

 crowded, those of the proximal half are almost minute, the two 

 groups gradually blending into each other on the sides. There is a 

 broad band of papillations around the ring. 



The tentacles are of moderate length and stoutness, compressed 

 but with a flat oral surface bearing a small groove. The clubs are 

 small, expanded, and bordered dorsally by a broad keel which origi- 

 nates well proximal to the basal suckers and extends to the tip. The 

 sucker pad or basal plate lies somewhat free posteriorly on the club 

 and is bordered by dorsal and ventral protective membranes. The 

 dorsal membrane extends downward on the stalk; the ventral mem- 

 brane nearly unites with the dorsal one but terminates immediately 

 on the stalk. The suckers are in about six rows and vary in size, about 

 four of those of the second dorsal row being greatly enlarged. The 

 horny rings of the large suckers bear long narrow square-tipped teeth 

 which are greatly crowded and are larger on the distal half. A narrow 

 band of papillations of the usual type surrounds the rings. 



The color of the animals, so long preserved in alcohol, is yellowish 

 superimposed by numerous very fine purplish chromatophores. 



The sculpture consists of the aforesaid row of lappets on the arms 

 and scattered rugae and papillae along the dorsum of the mantle, the 

 base of the fins, the sides of the ventral surface of the mantle, and a 

 patch of papillae below and in front of each eye. There are a few 

 papillae on the sides of the arms, especially on IV. 



The shell is rather narrow, rounded both anteriorly and posteriorly, 

 and with a short stout spine. Dorsally there is a median ridge which 

 is narrow posteriorly but broadens anteriorly, bordered by a narrow 

 flat area. On each side of this flat area, the shell is angled by a broad 

 concave slope which again flattens out to form the edge of the sheU. 

 Ventrally the shell is concave both anteriorly and posteriorly. The 

 loculus is only moderately thickened, concave mediaUy. The striated 

 area forms a straight narrow V with an arched anterior contour. 

 The outer cone is deeply spoon-shaped posteriorly with deepened sides. 

 The inner cone is thin but widened posteriorly and is fused throughout 

 to the outer cone. 



