ASTEROIDEA OF NORTU PACIFIC AND ADJACENT WATERS — FISUEK. 



221 



The adambulacral plates are very short and comparatively broad. The fur- 

 row spinelets (two or tlueo in number) arc short, thick, sonietinies compressed or 

 three-sided in section, and round-tipjied. The first actiual series of elongated 

 f^ranules or short spinelets (one or two in nundjer) are thick and intermediate in 

 size between the furrow spinelets and about four angular granules which occupy 

 the outer portion of plate. The two-jawed upright pediccllaria occurs on nearly 

 every plate in a spccmieu from station 3212 and from Bering Island, but are very 

 few in the Shumagin Island examples, and not numerous in tiiat from I'nalaska. 



Mouth plates not prominent, the combined pair rhomboid in outline, \vith 

 straight margins. Armature similar in character to that of adandiulacrals. Fur- 

 row series, seven or eight; about two series of granules (seven to nine in each) 

 occupy most of the surface of plates. 



Madrej)oric body situated one-third to nearly dUc-half r from center. Stria- 

 tions interrupted, often in the form of perforations. 



Type. — In U.S.Naticmal Museum. 



Type-locality. — Bering Island (X. Grebnitsky). 



Distrihntion. — From Bering Island along the Aleutians to Kadiak Island,. •Uaska, 

 low tide to 102 fathoms. 



Specimens examined. — Ten, from the following localities: 

 Specimens of CcramasUr arlicus examined. 



Locality. 



Bering Island, Commander Islands 



Round Island, Coal Harbor, Shumagin Islands. 



Sanborn Harbor, Shumagin Islands 



Unalaska and Unga, Aleutian Islands 



St. Paul, Kadiak, Alaska 



Station 3212, ofl St. Paul, Kadiak 



Depth. 



Beach 



Lowest water. 



102 fathoms, blue mud 



N. Orebnitsk)-. 



W. U. DaU 



do 



W. J. Fisher. 

 AUxUroat 



TT.8.N8t.Mus. 



Remarks. — This species is characterized by the few large granules of the abac- 

 tinal tabulate plates, the central granules being often lacking; by the very exten- 

 sive pa[)uliir areas, comprising practically tiic whole of the abactinal surface; by 

 the imbricating abactinal plates which are strongly lobed on one side only; by the 

 short and comparatively wide adambulacral plates which have only two or three 

 thickened furrow spinelets. 



Genus CLADASTER Verrill. 



Cladaster Verrii-L, Trans. Conn. Acad., vol. 10, 18!)!», p. 17 

 Verrill. 



, pi. 28, figs. 2, 2a-2c. Type, C. rudls 



Diagnosis. — In general appearance most closely resembling Hippastvria, but 

 differing in lacking secondary intermediate abactinal jilatcs, prominent marginal 

 tubercles or spines, and abactinal tubercles or spines. Abactinal plates hexagonal 

 or roundish, with spaced granules and sometimes with spatulato pedicellariir; 

 papuhv single at the rounded corners of the plates; marginal i)lates large, few, and 

 granular, not increasing in size distad, and without spines or pedicellaria" ; actinal 

 interradial areas extensive with rather large angular, rounilish or irregular plates 

 bearing spaced ecjual or unequal granules and spatulate pedicellaria^; adambulacral 

 armature similar to that of IIippo.<ittria: two prominent furrow si)in(>s, a large 

 heavy sutiambulacral spine, and several granules. 



