262 NEW STARFISHES AND OPHIURANS—VERRILL. vol.xvu. 



are naturally smaller and are occupied by a much smaller number of 

 granules, there being on the median row of the rays about ten or twelve 

 marginal and three or four central granules. The primary plates are 

 relatively larger than in the adults. The larger ventral iiiterradial 

 plates have about seven to ten marginal granules, and usually but one 

 in the center. The spines of the adambulacral plates form three pretty 

 regular longitudal rows; those of the inner or furrow- series are long 

 and slender and form a divergent group, usually of four on each plate ; 

 in the second row there are mostly four, which are much stouter, on 

 each plate; the outer row consists of from three to five on each plate, 

 similar to the adjacent granules. On the young specimens up to 50 mm. 

 in diameter no pedicellarise have been observed. A few often occur 

 on specimens 70 mm. in diameter, but they are often absent from the 

 largest sized specimens. 



Most of the specimens from station 2429 have the arms somewhat 

 longer and more attenuated distally than in the typical specimens. 

 One of these, having the radius of the disk 14 mm., that of the rays 

 42 mm., has the rays 6 mm. in the breadth in the middle, measuriug 

 from the mouth. 



A single six-rayed specimen occurred at station 2429. This is 54 mm. 

 in diameter; radius of the disk 10.5 mm. It agrees pretty closely with 

 the five-rayed specimens of similar size, but the granules of the actinal 

 plates are smaller and more numerous than usual, and many two-valved 

 pedicellaria? occur upon both the dorsal and ventral plates. In this 

 specimen the furrow-series of adambulacral spines consists of groups 

 of six and sometimes seven on each plate. 



Genus Odontastek, Verrill. 



Odontaster, Verrill, Amer. Journ. Science, xx, p. 402, 1880. 

 fGnafhasler, Sladen, op. cit., p. 185, 1889. 



This genus has a broad, stellate form, usually five-rayed. The abac- 

 tinal surface is covered with elevated, round parapaxillse, bearing spin- 

 ules. The papulje occupy the center of the disk and the median part 

 of the rays. Marginal plates convex, the two series about equally 

 developed with an odd interradial one in each series. Imperfect fascioles 

 occupy the sutures. Upper marginal plates covered with fine spinules; 

 lower ones with larger spines, similar to those of the lower surface of 

 the disk. Actinal plates numerous, pavement-like, in rows parallel to 

 the furrows, each with a group of erect spines. The adambulacral 

 plates are rather rectangular, with a furrow series of few large spines 

 in a simple row, and an actinal group of similar large spines. Each 

 jaw has on the actinal side and near its inner end a large, sharp 

 median spine or tooth-like process, which is directed outward. The 

 jaws have marginal and actinal rows of spines similar to those of the 

 adjacent plates. No pedicellariiie have been observed. 



In most respects the genus GnafJiaster of Sladen is identical with 



