92 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



from those near it by small aggregations of large granules. Now in 

 A. brandti the spines are present and the disks are present, as are, 

 too, the granules, but the granules, instead of separating the disks, 

 are placed upon them. 



The species may be thus defined : — Arms five, very long and 

 narrow, decreasing very gradually in width ; they are largely covered 

 with disk-like plates which are covered by large granules, with a 

 short white spine in the centre. The adambulacral spines are in 

 two longitudinal rows and subequal ; the disk -like plates on either 

 side are closely packed ; and their spines are much longer and stouter 

 than those on the dorsal surface. Between these lateral rows, and 

 extending across the arm, there are about eleven disks, which form 

 fairly regular longitudinal rows along the arm. The exceedingly 

 small central disk is not distinguished by any special spines; the 

 madreporic plate is orbicular and near the margin of the disk. 

 Spines all white, i2=86, r=7 ; or the greater is about twelve 

 times the length of the lesser radius. 



One specimen. Trinidad Channel, 30 fms. ; bottom, mud. 



AsTERiAS ALBA, u. sp. (Plate IX. fig. 2.) 



Arms five, rather stout, narrowing rather rapidly toward the end. 

 Spines mere projections on the dorsal and lateral surfaces ; adam- 

 bulacral spines in two rows, delicate and closely set ; these are 

 flanked by two rows of stouter conical spines, which gradually 

 diminish in size as they approach the distal end of the arm. External 

 to these rows there is a bare band, which occupies the greater part 

 of the side of the arm, and is separated from the barely convex 

 dorsal portion by a somewhat indistinct line of short inconsiderable 

 spines. The spines on the dorsal surface are no better developed ; 

 and the most important series is the median row of small projections. 

 The species presents some resemblance to A. antarctica ; and this is 

 specially well seen in the reticulated appearance produced by the mode 

 of arrangement of the calcareous bars which make up the dermal 

 skeleton. The disk is very small, and not provided with any longer 

 spines than the rest of the animal. The madreporic body is of a 

 dead white and difficult to detect. 72=73, r=10; therefore i?= 

 7-3 r. 



One specimen. Sandy Point, 7-10 fms. ; bottom, dead acorn- 

 shells. 



AsTERiAS OBTUsisPiNosA, sp. n. (Plate IX. fig. 3.) 



This species is at once remarkable for its short blunt spines, and 

 for the fringe of short spines which surround the madreporic body ; 

 these are about twelve in number, while in the long-armed A. spec- 

 tabilis of Philippi there are said to be eighteen. The adambulacral 

 spines are arranged in two longitudinal rows, and are much less 

 strong than the other spines ; those of the inner row are the 

 shorter. Beyond these there are three fairly regular rows of blunt 

 spines, the innermost of which only extends about halfway along 

 the arm. The side of the arm, bare of spines, is limited below by 



