840 DR. G. J. HINDE ON RECEPTACULITIDA. 
TIscHADITES ? INOSCULANS, Salter. 
Spherospongia inosculans, Salt. Pal. of Niti, p. 49, t. 5. figs. 7, 8, 9. 
This species is based on a small compressed fragment, 18 millim. 
long by 13 millim. wide, of an apparently conical individual. The 
outer surface consists of slightly convex elliptical plates? with 
small irregular digital projections which interlock with each other. 
The plates show no structure, nor are there any indications of spi- 
cular rays beneath them. Possibly the form may belong to a new 
genus, but as the only specimen known (now in the British Museum) 
is insufficient to furnish generic characters, it seems preferable to 
allow it to remain provisionally under Ischadites, which, as Salter 
remarks, it much resembles. 
Distribution.—Silurian : Niti Pass, Northern Himalaya. 
Genus Spumrosponera, Pengelly. 
SPH#ROSPONGIA TESSELLATA, Phill. sp. (Pl. XXXVILI. figs. 1,1 a—C.) 
1841. Spheromtes tessellatus, Phill. Pal. Foss. Devon, &c., p. 135, 
t. 59. f. 49. ! 
1832. Tunicate fossil, Broderip, Trans. Geol. Soc. ser. 2, vol. iii. 
Dp WOtt20 te 12. 
1844. Spheronites tessellatus, F. Rom. Rhein. Uebergangsgeb. 
. 64. 
: 1845. Echinospherites tessellatus, Murch. Keyserl. Vern. Geology 
of Russia, p.. 380, t. 27. £.'7; 
1845. Spheronites tessellatus, Bowerb. Ann. & Mag. Nat. Hist. 
vol. xv. p. 299. 
1845. Spheronites tessellatus, Austin, id. p. 406. 
1850-56. Proboscis of crinoid, G. & F. Sandberger, Verstein. des 
Rhein. Schicht.-Sys. pp. 384, 385. 
1861. Spherospongia tessellata, Pengelly, Geologist, vol. iv. p. 340, 
t. 5. 
1875. Pasceolus tessellatus et Rathi, Kayser, Zeitschr. d. deutsch. 
Geol. Gesellsch. p. 780, t. 20. 
1880. Polygonospherites tessellatus, F. Romer, Leth. Pal. Th. 1, 
[De allo tis Geax 
1880. Polygonospherites tessellatus, Zitt. Handb. der Pal. vol. i. 
De ize: 
The characters of the type species have been fully referred to in 
the description of the genus. The specimens vary greatly in dimen- 
sions; the typical form, though imperfect, is 85 millim. in height 
and 115 in width near the summit. The spicular head-plates are 
from -5 to 7°5 millim. in width. The average dimensions of a 
number of specimens in the British Museum are 60 millim. in height 
and the same in width, and the surface-plates are from 2-5 to 5 
millim. wide. | 
Ferd. Romer places the form described in the ‘ Geology of Russia” 
as distinct from this species, but judging from the figure given of it, 
there does not appear sufficient reason for separating it from S. tes- 
