SCTTALIA.— STACHYSPONGIA. 45 



There are several examples of this species in the collection, and they are very 

 constant in their outer form and other characters. 

 Distribution. Upper Chalk: Flamborough. 



SCYTALIA TEREBRATA, PMllipS. 



1835. Spongia terebrata, Phill. Geol. Yorks. p. 90, t. 1. f. 10. 

 1878. Scytalia terebrata, Zitt. Stud. II Ab. p. 65. 



Sponge massive, subcylindrical, with a flattened conical summit. The lower 

 portion of the body contracts to a cylindrical stem. The lateral surface carries 

 numerous concentric, slight, subangular ridges and shallow open furrows. The only 

 specimen in the collection is 220 mm. in length by 87 mm. in greatest width. 



The surface, with the exception of the summit, is covered with a smooth dermal 

 layer. The straight cylindrical cloaca is 13 mm. in width ; from its aperture numerous 

 sinuous canals extend to the margin of the cone. In a vertical section thickly set 

 canals, 1"25 mm. in width, are exposed, extending from the cloaca to the exterior. 



This species may be distinguished from the preceding by its different form and 

 larger dimensions. It appears to be the species indicated by Phillips's figure, which, 

 however, must have been drawn to the scale of one third the original. 



Distribution. Upper Chalk : Flamborough. 



Genus STACHYSPONGIA, Zittel, 1878. 



Stachtspongia spica, Bcemer, sp. (Plate VI. figs. 2, 2 a.) 



1864. Siphonocmlia spica, F. A. Roemer, Palseont. Bd. 13, p. 30, t. 11. f. 5. 

 1878. Stachyspongia spica, Zitt. Stud. II Ab. p. 65, t. 5. f. 5. 



Sponge massive, cylindrical, the surface covered with conical projections, disposed 

 either irregularly or rudely spiral, with their summits directed upwards. The 

 summit appears to have been truncate. An imperfect specimen is 210 mm. in 

 length and 73 mm. in diameter. The opening of the tubular cloaca is 31 mm. 

 wide at the summit, whilst at the basal end of the specimen it only measures 

 15 mm. Thickly set minute sinuous canals extend from its inner surface towards 

 the exterior of the sponge, The outer surface appears to have been covered by a 

 dermal layer, in which are irregularly disposed minute apertures from -3 to "6 mm. 

 in width. Beneath this layer the surface is closely seamed by sinuous canals about 

 0"75 mm. in width. I have not detected any special apertures at the summit of 

 the conical elevations. The spicules of the interior are so poorly preserved that only 

 their Rhizomorine characters can be distinguished. 



The example figured appears to belong to Eoemer's species, so far as can be judged 

 from his short description and diminutive figure. He states, however, that the 

 cloacal tube is only one fourth of the diameter of the sponge . but in the figure it 



