104 



ART. 2. — H. MATSÜMOTO. 



Oral shields large 

 and stout, pentagonal, 

 with acute inner and 

 lateral angles, rounded 

 outer angles, concave 

 outer lateral sides and 

 curved outer side. Adorai 

 shields large, long, stout, 

 three-sided, with round- 

 ed angles and nearly 

 straight adradial and 

 convex abradial sides, 

 meeting each other. 

 Three oral papillae on 

 either side ; the outer- 

 most one is very large, 

 flattened and blunt ; the 

 rest are conical, some- 

 what flattened, obtusely 

 pointed. There is an ad- 

 ditional pointed papilla, 

 which arises from the first ventral arm plate and is directed 

 inwards. Teeth stout, triangular, obtuse. 



Arms strongly knotted. Dorsal arm plates in the proximal 

 part very small, tlu'ee- sided, with strongly convex outer side and 

 very wide inner angle, much wider than long, with convex surface ; 

 more distally, they become more or less regularly triangular and 

 as long as, or longer than, wide. Lateral arm plates very well 

 developed, strongly constricted at the middle of each joint, those 

 of the two sides meeting: each other both above and below. First 



Fig. 27. OphiomUrella stellifera. xl2. a. From above. 

 b. From below, c. Side view of two arm joints near disk. 

 d. Side view of two disk tubercles. 



