68 



AET, 2. — H. MATSÜMOTO 



men; Oniga-sé, Sagami Sea; 150-200 fathoms. One specimen; 



locality unknown, probably Sagami Sea. 



Eastern Sea ; 103 fathoms (Clark). Off Omai Zaki, Yenshû 



Sea ; 34-37 fathoms (Claek). Off Suno Saki, Sagami Sea ; 44-50 



fathoms (Clark). 



The largest one of my 

 specimens measure 7 mm. across 

 the disk and 35 mm. in the 

 length of the arms. In one 

 specimen, some of the super- 

 ficial granules of the disk and 

 arms, both above and below, 

 bear here and there a very long 

 glassy hair. 



Ophiocrene Bell and the 

 Ophiocj^enoid stage. 



The curious genus, Ophio- 

 crene Bell, is characterised by 

 the disk being covered mostly 

 by the naked primary plates and by the radial shields being 

 not long and bar-like but short and rounded. I have two veiy 

 small, generically and specifically indeterminable specimens, which 

 are almost similar to Ophiocrene in dorsal view, but differ from it 

 in the occurrence of arm spines even in the very base of the 

 arms. According to Lyman and Grieg, very young specimens of 

 Gorgonocephalus ar oticus Leach {:=G. agassizi) also have the disk 

 essentially similar to that of Ophiocrene. I therefore imagine that, 

 the disk characters of Ophiocrene occur in a certain young stage 

 of many — presumably all — genera of the Gorgojiocephalidce, and 



Fig. 17. Asteroporp'i hadracantha. x8. a 

 From above, h. From below. 



