A. E. Verrill — Revision Genera and Species of Starfishes. 163 



and sets farther back, so as to be partly overlapped by the distal one 

 of the preceding plate; the others are rather short, stout, blunt, 

 scarcely tapered, about as long as the breadth of the adambulaci'al 

 plates. Outside the furrow-series, each plate bears an actinal group 

 of about seven to eleven short, stout, polygonal spinules or granules, 

 one of which occupies the center, and the others surround it ; those 

 on the side next the furrow-series are much larger and somewhat 

 longer than the rest. Oral spinules numerous, short, stout, poly- 

 gonal, seven or eight on the border of the dentary plate, and a 

 median or sutural group consisting of a row of six or eight on each 

 plate, with two shorter intermediate or- central rows of three or four 

 smaller ones. 



The actinal interradial plates are crowded, polygonal and closely 

 covered with small polygbnal granule-like spinules with rounded 

 tips, about thirty on the larger plates, their size decreasing toward 

 the marginal plates, where they are very small. 



The marginal plates, above and below, are closely covered with 

 similar but smaller granules. The plates of the upper surface are 

 hexagonal on the radial areas of the bases of the rays, and are 

 mostly transversely elongated, and surrounded by six papular pores, 

 corresponding to the angles. In the interradial areas they are trans- 

 versely rhombic, often with the acute angles truncated, where pores 

 intervene. All are closely covered with small angular granules. 



Madreporic plate small, with conspicuously convoluted, deep 

 grooves and high ridges. It is nearer to the center than to the 

 margin. 



Taken on the American Coast, by the " Albatross," at several 

 stations between N. lat. 44° 28' 30" and 41° 4V'. Also taken by the 

 Gloucester iishermen on the Banks off Nova Scotia. Occurs off the 

 coasts of Norway and Great Britain. 



Bathymetrical range, 50 to 471 fath. on the American coast. 

 Rarely taken below 150 fathoms. 



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



Plate XXVII. Figkjre 3. 



Pentagonal with regularly incurved margins and short, tapering 

 subacute rays. Radii as 13 : 8. 



Marginal spines large, mostly nearly square, slightly convex, the 

 upper and lower ones nearly corresponding along the margins of the 

 disk, but alternating on the distal part of the rays. There are 

 usually, in the type, 16 upper and 18 lower plates on each side of 



