Boone, Coelenterata, Cruises of "Ara" and "Alva" 59 



in length gradually through the series from proximal to distal, 

 the most proximal pinnae being from 0.5 to 0.6 the length of the 

 most distal pinnae. The stomodaeum extends nearly the entire 

 length of the anthocodia. 



The siphonozooids show an eight-rayed aperture, but no trace 

 of tentacles. The siphonozooids are numerous, closely set and 

 apparently irregularly arranged over the entire surface of the 

 trunk between the autozooids. The average vertical diameter of 

 a siphonozooid is 3 millimeters. 



There are two kinds of spicules that occur abundantly in the cor- 

 tex of the anthocodia, namely, sphaeroidal to ovoidal small bodies 

 with the external surfaces covered with fine sharp asperities and 

 somewhat larger ovoidal bodies in which the asperities are replaced 

 by larger, convex nodes. There are also five types of long, narrow 

 spicules that occur in the polyp in moderate quantities : (a) needle- 

 like spicules, three to four times as long as a sphaeroid, slightly 

 bowed, with one end rounded, the opposite end slightly dilated 

 and furnished with numerous out jutting spines; (b) very long 

 spicules, 2.8 to 3 times the length of the preceding needle-spicules, 

 with the median third twisted and contour somewhat irregularly 

 flexed ; (c) similar long needles, but with only three or four twists 

 widely spaced in the entire spicule; (d) similar long slender 

 needles of sinuate contour with both ends terminating in a cluster 

 of four to six outjutting spines; (e) needle spines of sinuate con- 

 tour with both lateral margins beset with numerous thorn-like 

 barbules. A third type of spicule found in the anthocodia is the 

 star-shaped type, shown in figure f , a six-rayed star wuth unequal 

 rays variously bent or curved, with a supporting rod or shaft, a 

 seventh ray, extending at right angles from the center of the star ; 

 there are also double stars, as shown in figure f , arising from the 

 same supporting rod. 



The spicules of the cortex of the stalk are scarce, of three 

 types: (a) subspherical to irregularly nodular small bodies ex- 

 ternally covered with convex nodes; (b) long, nearly straight 

 needle-like spicules with numerous barbules on the lateral surface, 

 also there are sinuate needle-like spines (figure g) ; there are 

 also four to six-rayed star-shaped spicules present. 



The spicules of the cortex of the rachis are abundant, in the 

 form of irregular shaped disks or scales, somewhat rosette-shaped, 



