UNDETERMINED STAUKOCALYPTÜS. 235 



They are common on or near the gastral surface. The terminals 

 are so fine that it is difficult to observe them in Canada-balsam 

 preparations. 



Basidictyonal beams as in Ä sp. «; nearly smooth, the scanty 

 microtubercles present being quite obsolete. 



Staiivocalypt as sp. '/. 



(This Contrib., PI. XL, figs. 11-15). 



On the same Hexactinella lorica as that which bore the 

 foregoing specimen ((^), was found another (PI. XL, fig. 11) of about 

 the same size and appearance but differing somewhat in some 

 points of the spiculation. 



Parenchymalia, as in S. sp. [-i. Prostal oxydiactins, under 

 34 IX in thickness. 



Dermalia (fig. 13), exclusively stauractins ; more or less convex 

 on the outside and with slightly roughened rays 90-230/^- long 

 and not thicker than 7? ix at base. 



Hypodermal oxypentactins, moderately large ; with compara- 

 tively slender rays, which are smooth except at the roughened 

 end. Length of paratangentials, up to 700 // ; thickness at base, 

 under 111 i'-. The unpaired proximal ray is longer than, — fre- 

 quently fully twice as long as — the paratangential in the same 

 spicule. 



Xo gastralia, nor microdiscohaxasters, were discovered. 



Oxyhexasters in moderate abundance (fig. 14) ; normal and 

 all of a uniform appearance. Two or three, sometimes four, slender, 

 rough terminals to a principal wdiicli is very short. Diameter, 

 128-138 //. 



