A. E. Verrill — Mevision Genera and Species of Starfishes. 165 



Greater radius, 44™°^; lesser, 27'"'", 



Taken by the U. S. Fish Com. steamer Albati'oss in the West 

 Indies, at station 2117, in 683 fathoms, and by the Blake, station xi, 

 in 555 fathoms, 1880. 



This species is very similar to T. Perrieri of the East Atlantic. 

 Without a direct comparison of specimens it is impossible to say 

 whether our form may not be merely a varietj^ of the latter. How- 

 evei', the American form differs from the photographic figures of 

 :7'. Perrieri in having larger marginal plates and in the details of 

 the actinal surface. Moreover its pedicellariae are much fewer and 

 apparently are different in form. 



Tosia (Plinthaster) nitida Ver., sp. nov. 



Plate XXVII. Figures 1, la, \b. 



Pentagonal with regular incurved sides; 18 or 19 upper marginal 

 plates on each side; 20 lower ones; 4 or 5 upper marginal plates are 

 in contact medially. 



Closely allied to the preceding species in form and most of the 

 details of structure. It differs chiefly in the finer granulation and in 

 having the abactinal plates more closely crowded and even, with less 

 evident sutures between them and with the areolation of their surface 

 much finer ; the granules around their margins are also much smaller 

 and lacking in many places, but a group of rather larger ones sur- 

 rounds each of the very small, unequal papular pores, so that these 

 appear quite distinctly over a limited basal radial area. They are 

 lacking on the central part of the disk and on the large interradial 

 areas. 



The dorsal marginal plates are partially naked and smooth, but 

 have a central group of well spaced, rounded, implanted granules, as 

 in T. cotnpta, but the granules are much smaller ; the lower third of 

 these plates is closely covered with small round granules, like those 

 of the ventral plates. The adambulacral plates, on the proximal part 

 of the groove, usually have five or six slender, compressed furrow 

 spines, in a straight row ; the actinal surface of each plate bears two 

 rows of small, blunt, granule-like spinules, much like the granules of 

 the actinal plates. 



Pedicellai'iae of small size, similar to the granules in appearance, 

 occur sparingly on some of the distal adambulacral plates. 



Greater radius, 27""" ; lesser, 15"""^. 



Taken by the Albatross, in the West Indies, at station 2396, in 335 

 fathoms. 



