238 BRITISH JURASSIC SPONGES. 
45, LyMNorELLA pyamm@a, Sollas. Plate XVIII, figs. 4—4 b. 
1883. Limnorpa pramma, Sollas. Quart. Journ. Geol. Soc., vol. xxxix, p. 549, 
pl. xxi, figs. 29, 30. 
Sponges occasionally simple, but usually in small colonies of teat-like or 
obtusely conical individuals from 5 to 11 mm. in thickness at their bases. The 
basal portion either with a short thick peduncle or concave ; in both cases it is 
enclosed in a wrinkled dermal layer, which also sometimes envelops the sides of 
the spongites, leaving their summits free. 
The oscule at the summit of the spongites is circular with entire margin, and 
from 1 to 2 mm. in width. The skeleton fibres vary from ‘08 to ‘13 mm. in 
thickness ; they are of the same character and in the same condition of preserva- 
tion as those of L. manullosa. 
Of the specimens referred to this species, two are simple forms about 5 mm. 
in thickness by 8 mm. in height ; the others are small masses, the largest of which 
is 30 mm. in breadth by 20 mm. in height, and the spongites in it are larger than 
the specimens described by Prof. Sollas, but they appear to be of the same 
character. The individuals in the colonies are freer and more distinct than in 
L. mamillosa, and in this respect they approach the forms figured by Michelin as 
L. mamillosa (‘Icon. Zoophy.,’ p. 247, pl. lvii, figs. 10 a, 106), but which appear 
to me to be distinct from the types of this species. 
Distribution.—Inferior Oolite. Pea-grit series, near Cheltenham (Mr. F. 
Longe); Parkinsoni-zone at Shipton Gorge (Mr. E. A. Walford). Great Oolite, 
Hampton Down, near Bath (Rev. G. F. Whidborne). I have not seen the type- 
forms of this species, which have been mislaid. 
46. LyMNoRELLA RaMosa, Hinde, sp. nov. Plate XVIII, figs. 6—6 b. 
Sponges growing in bushy masses of subcylindrical or compressed solid 
branches springing from a thickened basal stock. The branches dichotomize, and 
are either obtusely conical or laterally compressed and rounded at their summits, 
and they show indications of growth by overlapping layers as in L. inclusa. No 
compact dermal layer is present in the specimens yet known. The branches are 
from 6 to 14 mm. in thickness ; they terminate blindly, and are without oscules or 
axial canals. The surface of the branches is smooth from the exterior fibres being 
thickened, so that there are only small apertures between them. Scattered 
