\-im...;i.!\ 01 NORTH PACIFIC kND APJACXW Wl 155 



The example from off Petropavlovak, Avatka Bay, Kamchatka pi 68 

 roggeste M representative oi a Blightly differentiated race. There u but one 

 Bpecimen, and therefore do chance to teal the constancy of it- characters The 

 abactinal Bpinea are more numerous than in typical east Bet i are 



grouped, or in lines, bo thai the reticulum of the skeleton is indicated, but not clearly 

 marked; there are but five -cue- of actinal plates, and only four are prominent 

 proximal Buperomarginal plates are polyacanthid; the adambulacrals are diplacan- 

 tliid, and the Btraight pedicellariae are few instead of abundant. The small b] 

 men from the Okhotsk Sea, having K f»; mm., baa four Beriee of actinals, typical 

 abactinal Bpines, and very abundant Btraight pedicellariae 



itomical notes. The carina] plates arc four lobed, and Btrongrj imbricated in 

 Beriee The dorsolaterals arc irregular, in outline separated leas than their own 

 diameter (occasionally directly overlapping by a lobe), and arc connected by elon- 

 gated Becondary ossicles on the coelomic aide, These become l< 

 margina] plates, and all underlap Btrongly the major plat* tring above as narrow 



connecting pieces or trabeculae of the reticulum, of which the primary plates form the 

 disproportionately thickened codes. The marginals and actinals arc four lobed 

 transverse lobes the longer) verj Btrongly imbricated, so that the intervals between 

 the plates arc rather small, and the plates decrease in size from the Buperomarginals 

 to the innermost or Beventb scries of actinal- which is spineless. The upper, 

 underlying, lobe of the actinals is the longest and is more or less compressed un<l 

 carinated, 



The adambulacral plates are very short and broad, the width equaling the 

 length of a hoi n five consecutive plates The ambulacrals arc also very wide and short, 

 the width of course varying in different parte of the ray. The ambulacra! pores are 

 quite -lnlike. In large specimens there arc li ambulacra] plates in the length of io 

 mm. (about opposite interbrachia] angle). 



The o\ aries of a small Bpecimen I K \--> mm. i arc mature and open dorsally 

 to the interradial fine at about mi<l r. The gonad is roughly Bpindle-ehaped and 

 consists of anmerous short Bubequal lobulated divisions arranged rather symmetric- 

 ally around a central BJOS. 



Type.- Cat No E1237, 1 5>N M 



Typt locality. Station 3278, north of the end ..f the Alaska Peninsula 

 30" N . 162 13 W . 17 fathom-, fine gray sand; bottom temperature, 38 B I 

 Southern Bering Sea, from Bristol Kay to (Jnalaaka; thi 



Asia from Avatka Hay. Kamchatka, to the Okhotsk Sea; 11 to 48 fathoms, line 



-and. mud. pebbles, Btones; temperature ranee 38 to 1 1 -' f 

 Spt liiirtecn. 



