ART. 12 HEXACTINELLID SPONGES — OKADA 37 



parenchyme, while form B (fig. 5, d) is rarely found in siibclermal 

 regions. Much preparation and special research will be necessary 

 to find it. 



Form A measures 70/i, to 80^^ in diameter, and is provided with 

 tolerably long, smooth principals, measuring about 20/^, which are 

 divided into 2 to 3 short, straight, narrowly divergent terminals 

 tipped with a small pinhead knob. Form B, which is found very 

 rarely in subdermal regions, measures 90/x to 95/x in diameter and 

 is characterized by fairly long S-shaped terminals, disposed in a 

 perianthlike whorl tipped with a small knob. 



Clavulae are of two kinds, namely, circular umbellate and delicate 

 anchorate hooked ; both occur in the dermal layer. 



The circular umbellate clavulae (fig. 5, g) represent a common type 

 that appears in many members of this genus. They occur rarely on 

 the surface of the dermal layer, penetrating perpendicularly to the 

 surface, close to the unpaired proximal rays of the dermal pentactins. 

 The umbel is provided with minute teeth on the margin and is 20,u, 

 broad. The shaft is 200|U, long, somewhat broadened just below the 

 umbel, and gradually attenuated toward the conically pointed end. 

 The surface is sparsely roughened, the roughness being somewhat 

 pronounced on the proximal parts of the shaft. 



Of the anchorate hooked clavulae two kinds of small forms are 

 found. In one form (fig. 5, ?', j) the shaft shows toward its upper 

 end at most a gentle thickening, which bears terminally 6 to 8 

 delicate, slender, markedly recurved hooks, or teeth, producing a 

 certain resemblance to an anchor. The so-called head frequently 

 shows an external slightly raised swelling at the center which occa- 

 sionally is entirely absent, then being represented merely by a 

 convex surface. The shaft is 200^^ long, and 3/* broad proximally. 

 The head, at least, and the greater part of the shaft, are partly desti- 

 tute of the roughness so frequent in the circular umbellate clavulae. 



In the other form (fig. 5, h) the end of the shaft makes a promi- 

 nent conical swelling, from which 3 or 4 slender curved hooks 

 project. This form occurs infrequently in the dermal layer, inter- 

 mixed with the former, and measures 200jw in length. The shaft is 

 entirely smooth and totally devoid of lateral spines. 



FARREA SOLLASII F. E. Schuize 



Farrea sollasii F. E. Schulze, Rep. Voy. Challenger, vol. 21, p. 281, pi. 74, 

 figs. 1-6, 1887. ^ 



There is a single specimen in the collection that may be identified 

 as F. sollasii. It was collected from a depth of 197 fathoms at the 

 entrance to Uraga Strait, between Jogashima and Okinose in Sagami 

 Sea (Station 5091). I wish to call attention here to the numerous 

 larvae of this species that were found in the maternal sponge body. 



