14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



than the proximal unpaired ray, which measures 3 mm to 5 mm in 

 length. Their raj^s are quite smooth and taper gradually toward the 

 conically pointed end, measuring 30/ji to 50/^ thick at the base. 



In the parenchymalia and hypodermalia, there are greater or 

 smaller numbers of macrouncinates, 6/x to 7 mm or more long and up 

 to 10/x thick. They are quite similar to the macrouncinates occurring 

 in species of Farrea and are covered with spines situated very ob- 

 liquely and extending nearly parallel, close to the shaft of the spicule. 

 They are arranged radially or irregularly, the thicker distal end 

 lying in the outer surface of the sponge. Frequently the macrounci- 

 nates show a heteropole form, having a sharply pointed distal end 

 and a spherically expanded proximal end whose surface is nearly 

 smooth or slightly rough. The entire surface of the spicule, except 

 the proximal end, is also covered with obliquely directed spines. 



I will not describe the microscleres. Pinules are found in the 

 dermal membranes, where they generally stand close together, form- 

 ing a quadratic network because the basal rays extend side by side 

 for considerable lengths, while in the gastral membrane they are 

 sparsely distributed, not forming a network. 



The dermal pinules are somewhat smaller than the gastral ones. 

 They are about 160/a to 230/a high; their basal rays, which form a 

 rectangular cross, are about 180/i to 240/1, long, gradually attenuated 

 toward the conically pointed end, and slightly spined on all parts, 

 most distinctly so on the distal part. The unpaired distal rays 

 have a prominent terminal spine and numerous long and somewhat 

 stout lateral spines, terminally only slightly curved, extending 

 obliquely upward. It consists of a smooth proximal part 8/^ to 12/i, 

 thick and 12ju, or more long, and a somewhat bushy, conically shaped 

 distal part 28/x in breadth, covered with obliquely curved spines 

 proximal to it, with vertically directed spines. 



The gastral pinules have a considerably longer distal unpaired ray 

 measuring 300/x to 360/a in length, with the basal rays 210,ti to 230/x 

 long, but otherwise nearly similar to the dermal pinules. In these 

 pinules, the distal ray shows a somewhat whiplike appearance, cov- 

 ered with tolerably short spines, obliquely directed upward. 



I have not been able to find any macramphidisks. I do not wish 

 to assert, however, that such spicules are entirely absent. Mesam- 

 phidisks are very sparsely scattered in the parenchymalia. They 

 measure about 125/x in length and have bell-shaped terminal disks 25/x 

 high and 36//, broad, with 8 to 12 marginal teeth, pointed at the ends. 

 Micramphidisks are of the usual shape, with hemispherical terminal 

 disks 10/x broad and 12 to 18 marginal teeth. They measure about 

 28/1 in length. 



Microhexactins are numerous in the parenchyme of the entire 

 sponge body. Their rays are frequently of a medium thickness of 6/i 



