CALYCOSILVA CANTHARELLUS. 
67 
hemioxyhexastrose character, identical with the oxyhexasters in structure. 
The basal part of the end-rays is usually directed obliquely outward and encloses 
an angle of 40°-45° with the continuation of the main-ray. A short distance 
from their origin the end-rays are curved rather abruptly toward the continua- 
tion of the main-ray, whereupon they straighten out, their middle- and end- 
parts being straight, or only slightly curved. The end-rays are 42-56 p long, 
and 1.5-3 m thick at the base. They are conic and taper very uniformly to an 
extremely fine point. The main-rays are smooth, the end-rays covered with 
rather numerous slender, oblique, backwardly directed spines, which attain a 
length of 0.3-0. 5 p. 
The dermal and the gastral pinnies and the spiculation generally indicate 
that the thin lamellar fragment above described formed part of a caulophacid 
sponge. It differs, however, from all the known forms of the Caulophacidae 
which comprise Caulophacus F. E. Schulze, Sympagella 0. Schmitt, Aulascus 
F. E. Schulze (identical, according to Ijima, with Sympagella) , and Calycosilva 
Lendenfeld (comprising part of F. E. Schulze’s Calycosoma). The absence of 
discohexasters, hemidiscohexasters, and discohexactines makes it impossible to 
place it in the genus Caulophacus, the absence of plumicomes excludes it from 
Sympagella, Aulascus, and Calycosilva. The new genus is named Caulophacella 
on account of its similarity to Caulophacus. 
CALYCOSILVA, gen. nov. 
Stalked, calyculate or mushroom-shaped Caulophacidae. The choanosomal 
megascleres are rhabds and hexactines. Hypodermal pentact.ines are always pres- 
ent. Hypogastral pentactines are present or absent. The surface is covered with 
hexactine pinules which are similar on the dermal and gastral side of the body. 
The proximal ray of some of the pinules may be reduced. The microscleres are 
onychhexasters and plumicomes to which oxyhexasters and helonychhexasters 
may be added. Without discohexasters and discohexactine microscleres. 
The collection contains one complete specimen and thirty-one fragments 
referred to this genus, all of which belong to a new species. 
Calycosilva cantharellus, sp. nov. 
helix, var. nov. 
Plate l,figs. 1-8, 20-24; Plate 2, figs. 3, 7-13, 15; Plate 3, figs. 1-5, 8-30; Plate 4, figs. 23, 24; Plate 5, 
figs. 1, 2, 4, 5, 7-9, 11-15, 18-20; Plate 6, figs. 5-21, 24-34; Plate 7, figs. 1-10, 12-14, 16, 17. 
