210 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.8 



This species is closely related to T. floridae (Perrier), the pedicel- 

 lariae of which have small racquet-shaped jaws with a slender, long pedi- 

 cel and a broad distal expansion with smooth, convex margin. T. sclero- 

 derma (Fisher) is more distantly related. It has exceedingly tiny gran- 

 ules, difficult to detect until the specimen is dried. The subambulacral 

 spines are spaced from the furrow series, and the interval is thickly cov- 

 ered with minute granules. The proximal furrow spinelets of T. sclero- 

 derma have a rudimentaiy groove or concavity on the furrow face. 



The name obstipa has reference to the pedicellariae, which are bent 

 out of a straight line. 



Asteriidae 



Genus CORONASTER Perrier 



Coronaster marchenus, new species 

 Plate 33, Figs. 5-6; Plate 34, Figs. 2-6 



Description. — Rays 11 to 17, deciduous; R^80 mm., R=8 r. 



Skeleton weak, reticulate, composed of numerous 3- to 5-lobed pri- 

 mary plates connected by 1 to 4 slender, imbricated ossicles. Reticulum of 

 disk irregular with much smaller meshes than that of the ray. These are 

 veiy small in a zone at periphery of disk, where the plates are irregular 

 and form a more solid framework. Between this peripheral frame and 

 the first transverse arch of abactinal ray plates is a line of weakness where 

 autotomy occurs. Primary plates of disk with a single acicular spine about 

 1.5 mm. long. 



Skeleton of ray is composed of 5 radial rows of slender, 3- to 5-lobed 

 plates connected radially and transversely by narrow, elongated ossicles, 

 forming 4 rows of subrectangular papular areas. The carinal row consists 

 of 9 to 12 spine-bearing plates that extend to middle of ray, beyond which 

 degeneration takes place, leaving only the marginals. On the distal half 

 of ray gradual degeneration of longitudinally united secondaries has oc- 

 curred. The larger specimens have proximally a dorsolateral series con- 

 sisting of 5 to 8 spine-bearing plates confined to the basal third of ray. 

 The superomarginal and inferomarginal series consists of 20 to 25 spinif- 

 erous plates extending to ray tips. Each plate bears a large, acicular spine 

 about 3 mm. long. 



The adambulacral plates are long, narrow, and set at a 45° angle to 

 the furrow; the distal half of one plate overlaps the proximal half of the 

 next plate on the furrow side. Each plate bears an oblique series of 2 



