UNDETERMINED STAUROCALYPTUS. 233 



The spiculation as described above seems to come nearest 

 to, and indeed closely resembles, that of Staurocahjptus rœpcrl 

 (F. E, ScH.). But, under the circumstances, I hesitate to make 

 a definite specific determination. 



Staurocalypffts sp. ß. 

 (Figures in Contrib. TIL, PL III., figs. 7-13). 



On another HexactineUa lorica from an unknown spot in the 

 Sagarai Sea was found the small specimen here to be described, 

 together with some other Hexactinellid species {Leucopsacus 

 scoliodocus, Lanuginella pupa, Skiurocalyptus pleorhaphides). 



The specimen is shown in /. c, PL III., fig. 9. Barrel- 

 shaped ; only al)0ut 4 2 mm. high ; with numerous fine prostal 

 needles and a deep gastral cavity. A comparatively wide subder- 

 mal cavity exists. 



The parenchymalia are all slender diactins, rough only near 

 the sharply pointed ends and generally without a swelling around 

 the spicular center. Prostal needles, 4 mm. or over in length 

 and up to ö7 /^ in thickness. 



The dermalia are mainly oxystauractins and rarely oxypent- 

 actins, in both of which the cruciate paratangentials are slightly 

 convex on the distal side. Rays, slightly rough ; 100-154/^ long 

 and 6-7è ix thick at base. (For the dermalia and hypodermalia, 

 see /. c, PL III., fig. 7). 



The hypodermalia are oxypentactins with paratangentials up 

 to 450 ix long and 27 /^ thick at base. The rays are usually 

 smooth except at the roughened ends, but in some of the spicules 

 I have found the paratangentials thickly beset all over with 



