A. E. Verrill — Revision Genera and Species of Starfishes. 215 



The jaws ai'e very prominent, elliptical in outline. There are two 

 or four tapered apical spines, much lai'ger than the rest; the furrow- 

 series is convex and contains 9 or 10 small spinules, like those of the 

 adambulacrals. The elevated actinal surface is coA^ered with many 

 small, acute, spaced spinules, in three or four irregular rows. 



No pedicellariae could be found. 



A large specimen has the larger radius, 115""°; lesser, 21"™. 



Taken by the Blake Exped. in 358 fathoms, off Santa Cruz, etc., 

 and by the Albatross in the West Indies and Gulf of Mexico, at 

 several localities, in 335 to 347 fathoms. 



I have compared the Albatross specimens with the types of Perrier 

 from the Blake Expedition. 



Prionaster Ver., gen. nov. 



Stellate with long, tapered, squarish rays, high at base. 



Abactinal paxillae are arranged on the rays, in obliquely trans- 

 verse rows, about four rows to each marginal plate ; they are small, 

 high, rounded or elliptical, with a terminal cluster of small spinules. 



Marginal plates large, high, not encroaching much on the disk, 

 those on the interradial regions much higher than those of the rays. 

 There is an odd interradial plate above and below, similar to the 

 others in size and shape. The upper and lower plates correspond 

 accurately even to the end of the ray. The proximal upper ones 

 mostly have a central, acute, movable spine near the upper end. 

 The lower ones may also bear a small spine. All are margined by a 

 very regular series of small pectinate spinules, webbed together. 

 Some of them may bear groups of minute granules. 



The actinal plates are not numerous, flat, covered with thin mem- 

 brane and with a few small scattered spinules, and a marginal series 

 webbed together, so as to form fascioles. They are arranged in 

 double series ; the series are separated by the fascioles, but the two 

 rows of a series are not. An odd interradial series, with two rows 

 of plates, runs from the jaw and first adambulacral plates to the odd 

 interradial marginal plate. (See Plate xxvii, figure 4a.) The other 

 series correspond each to a marginal plate, but have no regular rela- 

 tion to the adambulacrals. 



The jaws are very prominent, with a large sutural groove. They 

 have each two large apical spines and a row of sutural spinules. 

 The adambulacral plates are large and project far over the furrow, 

 so that the spines meet across it. They have a furrow series of 

 numerous small spinules, webbed together ; their latei'al and outer 

 margins have smaller webbed spinules. 



