74 



THE SPONGES 



COSCINOPORIDAE Zittel. 



Chonelasma F. E. Schulze. 



1887. Chonelasma Sclmlze, 1887, p. 320. 



Chonelasma calyx F. E. Schulze (sp. ?). 



Plate 10, Fig. 5. 



1887. Chonelasma calyx Schulze, 1887, p. 326, Plate LXXXIX. 

 1899. " " Sclmlze, 1899, p. 78, Taf. XIX. Fig. 5. 



Station 3354, 3 imperfect specimens in which only the dictyonal frame- 

 work is preserved. The identification is therefore in a measure uncertain, 

 although a direct comparison with ft calyx makes it probable that the 

 " Albatross " specimens belong to this species. 



As in many of Schulze's specimens of C. calyx from the west coast of 

 America (Schulze, 1899, p. 79), the lower part of the body forms a stalk. 

 The stalk is roughly cylindrical, about 10 mm. in diameter and up to 

 40 mm. long. It expands below to form a basal plate, the under surface 

 of which is smooth. The vase-shaped body, into which the stalk passes, 

 has a wall 2-4 mm. thick. In the best specimen the vase is somewhat 

 cylindrical, beginning to flare in its upper part, where it is broken off. 

 In this individual the cavity of the vase is crossed by an oblique septum, 

 perforated by several large apertures (Plate 10, Pig. 5). The septum is 

 very thin, and is composed of delicate strands which form a coarse 



reticulum. 



The skeletal framework at the outer surface is irregularly arranged so 



as to bound rounded apertures. On the inner surface a fairly regular 

 crossing of circular and longitudinal fibres is obvious. This contrast between 

 the two surfaces exists in (7. calyx, but also in other species of Chonelasma 

 (C. tenerum F. E. Sch., Schulze, 1887; C. lamella F. E. Sch., Schulze, 1887). 



The nearly parallel trabecular plates (Balkenzuge) described by Schulze 

 for ft calyx (Schulze, 1899, p. 78) as lying edgewise to the surface of the 

 body and extending from below upward are distinctly marked in my 



specimens. 



In the specimens of ft calyx from Japan described by Schulze (1887, 

 p. 326) the dictyonal framework consisted "partly of perfectly smooth 

 beams and partly of beams sparsely covered with tubercles/' whereas in 





