22 ART. 7. — I. IJIMA : HEXACTINELLIDA, IV. 



SCYPHIDIUM LONGISPINA (Ij.) 



Plate II. 

 Rossella longispina, Ijima, '96, p. 253. 



Two specimens are now before me. The type-specimen, 

 which is the larger and on which my original description was 

 based, comes from Yodomi in the Sagami Sea (depth, abont 429 

 m.). The second specimen, obtained last year, is from Inside 

 Okinose (about 572 m.). In general appearance l)0tli are not unlike 

 certain Slaurocalyptus or Rhahdocalyptus with spiny prostal needles. 



The type-specimen (PI. II., fig. 1) represents a pear-shaped, 

 laterally compressed, thick-walled sac narrowed below into a 

 stalk-like base, where it is torn off. Length, 51 mm.; greatest 

 breadth, 37 mm. Thickness of wall, in ^^l^ces G mm. The 

 osculum at the top is oval, 14 mm. by 7.5 mm.; its edge, thin 

 and simple. The external surface is uneven on account of low 

 conical elevations, from the aj^ex of which strong diactinic pros- 

 talia project in an obliquely upward direction, some to a length 

 of 30 mm. or more. These prostal needles stand out sometimes 

 singly, but more commonly two or more (up to about half a 

 dozen) t02;ether in tufts. Thev mav moreover l)e associated with 

 a few small and inconspicuous pentactinic prostalia, wdiich are 

 far two sparse to form a veil. Between the apices of the eleva- 

 tions the dermal surface is quite smooth. (PI. IL, fig. 10). 



Attached to the diactinic prostalia and apparently pierced 

 right through by these, there are two small young individuals of 

 the same species. Possibly they arose as buds, which, after separa- 

 tion from the mother-body, were shifted outwards along the 

 prostalia, similarly as in Lophoccdyx fhili'piymensis. One of the 



