VEERUCULINA. — STICHOPHTMA. 41 



Vekkuculina papillata, Hinde, n. sp. (Plate V. figs. 2, 2 a.) 



Sponges either cup- or funnel-shaped, or growing in thick undulating expansions ; 

 the margins rounded and frequently digitate. The walls are massive, and vary in 

 thickness from 19 to 29 mm. 



The upper surface has numerous, irregularly disposed papillae, some of which 

 project 7 mm. above the surface. The oscules at their summits are 2*25 mm. in 

 width. These oscules are the apertures of cylindrical canals which are continued in 

 an oblique direction to the base of the sponge. The under or lower surface of the 

 wall has irregularly disposed apertures 1-5 mm. in width, and from one to three 

 diameters apart, which project slightly above the surface. Both surfaces are provided 

 with a compact dermal layer. 



The substance of the wall is composed of delicate anastomosing fibres ; the spicules 

 of these fibres are obliterated. 



A specimen in the collection measures 140 mm. in width and 110 mm. in height. 



The distinguishing feature of this species is the presence of the oblique canals 

 which extend throughout the sponge. These canals resemble those of the next 

 genus SticJiophyma ; thus this form exhibits characters intermediate between Verru- 

 GuUna and Sticliophyma. The only other species of Verruculina with which it can 

 be compared is the V. macrommata, Roemer ; but in this form, so far as can be judged 

 from the figures, the oscules are not carried on the summit of papillse, and the inter- 

 mediate surface is perforated with small apertures. Nothing is stated respecting the 

 interior canal-structure of this species ; so that I cannot say if any resemblance exists 

 in this respect. 



This species appears to be rare. 



Distribution. Upper Chalk : Flamborough. 



Genus STICHOPHYMA, PomeJ, 1866. 

 Stichophyma tcebinatdm, Roemer, sp. 



1840. Manon turUnatwn, F. A. Roemer, Xordd. Kreide. p. 3, t. 1. f. 5. 

 1878. Stichophyma turhmaia, Zitt. Stud. II Ab. p. 61, t. 4. f. 5. 



Listrihution. Upper Chalk: Goslar. 



Stichophyma tumidum, Hinde, n. sp. (Plate V. figs. 3, 4.) 



1848. Rhizospongia polymorpha, p. p., Charlesworth, Proe. York. Phil. Soc. p. 73. 



Sponges simple, elongate, club-shaped, or subcylindrical, usually widest near the 



summit, and gradually diminishing towards the basal end. The stem exhibits 



alternate horizontal swellings and contractions; near the upper portion in some 



specimens it becomes nodose ; the summit is either conical, rounded, or subtruncate. 



G 



