CALYCOSILVA CANTHARELLTTS. 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 then- 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 42-50 ^ long, 

 and 1.5-3 fx 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 m- 



The dermal and the gastral pinules and the spiculation generally indicate 

 that the tliin 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 O. 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 pentactines 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 1, 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. 



