K. OKINOSEANA. — SPICULATION. 2o5 



greater part of its length with erectly out-standing microtubercles. 

 The paratnngentials are comparatively very shoit (up to 240 ,"• 

 in length) ; they are rough-surfaced only near the end. The 

 prolonged proximal ray is nearly smooth all over. An idea 

 of the large size attained hv the dermal hexactins on the cuft- 

 edge, and of the variability in size of the dermalia in general, 

 may be obtained by comparing fig. 13 with figs. 14-18, all of 

 which figures are drawn on the same scale of magnification. 

 Not that all the hexactins on the cufT-edge are uniformly large, 

 but there are mixed with them smaller ones which connect them 

 with the dermalia of the general surface. The distal rays, in 

 forming the inconspicuous marginal row before mentioned, are 

 accompanied by a number of rhaphides, not with diactiu comi- 

 talia. 



Noteworthy is the fact that along the cuff-edge as well as 

 in certain parts of the ledges, the stronger-rayed dermal hexac- 

 tins apparently take their origin among the parenchymalia and 

 are subsequently added to the dermal layer from below. 



T\\Q gadralia are pentactins of various sizes and of irregular 

 appearance in so far as the paratangentials are often not straight, 

 and are of unequal length in tlie same spicule. The rays are 

 frequently only about 175 /< long, while at other times they are 

 fuUv four times as long, with an average breadth of 17 a. The 

 unpaired distal ray may be shorter or longer than the average 

 length of the paratangentials. The rudiment of a sixth ray is 

 generally present in the form of a hemispherical knob. All 

 the developed rays are subterminally faintly rough, the very 

 ends being rounded or pointed. 



The gastralia are found in irregularly scattered distribution. 



