BLASTINIA ASPERA. 247 
standing as to the real size of the form figured by Goldfuss I previously placed the 
specimen from the Richmond well-boring as a separate species. I consider, how- 
ever, that the forms placed in this species by Quenstedt (‘Der Jura,’ p. 695, 
pl. Ixxxiv, fig. 8; and ‘ Petref. Deutschl.,’ vol. v, p. 221, pl. exxv, figs. 19—22) are 
distinct from Goldfuss’s type, and probably belong to another species, if not to 
another genus. The specimen also which I named Blastinia pygmea (‘ Quart. Journ. 
Geol. Soe.,’ vol. xl, p. 781, pl. xxxv, figs. 4, 4a) seems to me now to be possibly 
a young form of this or of some other species, and the name should be dropped. 
Distribution.—Inferior Oolite, Oolite-Marl, Ravensgate Hill, near Cheltenham. 
Collected by Mr. R. F. Tomes. Also from the Jurassic beds met with in the 
well-boring at Richmond, Surrey, at a depth of 1205 feet. Middle beds of the 
Jura-Kalk at Streitberg (Goldfuss). 
55. Buastinia aspera, Hinde, sp. nov. Plate XIX, figs. 6—6 d. 
Sponges simple or compound ; the simple forms are conical, pyramidal, hemi- 
spherical, and occasionally irregular; the base is flattened or concave according 
to the surface to which it has been attached; the dermal layer is limited to the 
base. The ridges or crests are usually sharp-edged, with lateral corrugations ; 
they are separated by wide open depressions, or they stand out as flange-like 
lobes, from three to six in number, which usually unite at the summit, though in 
some cases there is a furrow between them above. ‘The specimens vary consider- 
ably in form and size; the smallest individual is only 9 mm. in height by 8 mm. 
in diameter, whilst a compound specimen, in which several conical forms grow on 
a common base, is 20 mm. in height, 24 mm. in length, and 17 mm. in diameter. 
In transverse section the skeleton has the same general arrangement as in 
B. costata,—that is, there are simple delicate fibres, mainly of three-rayed spicules, 
in a single series near the exterior, whilst in the central portion of the ridges the 
fibres are unusually thick (Pl. XIX, fig. 6c), ranging from ‘4mm. to 1 mm. in 
width, though built up of the same kind of spicules as in the more delicate fibres. 
The rays of the spicules reach up to ‘21 mm. in length by ‘05 mm. in thickness. 
By its larger size, mode of growth, and disposition of the fibres, this species 
may be distinguished from B. costata, Goldfuss, to which it is nearest allied. 
The specimens do not appear to be uncommon; those which I have seen were all 
obtained by Mr. 8. Chadwick, of Malton. 
Distribution.—Coral Rag, Perarmatus-zone, at Suffield, near Scarborough, 
Yorkshire. (Coll. Mr. S. Chadwick.) 
