176 Mr. H.J. Carter on new Species of Subspherous Sponges. 
secunda ante medium tertiaque prope maculam apicalem, 
abbreviatis). 
Long. 7 lin., lat. 2 lin. 
Shining piceous black; the mouth, palpi, antenne, the Pepe 
and apex of the elytra, the legs (except the middle of the 
ee a 
near the o dd spot 
e specimen. This also is a Brazilian genus. 
[To be continued. | 
XV.—On two New Poms tro Subspherous ^s mg with 
Observations. CARTER, F.R.S. & 
ads XIII.] 
AT the request of my kind friend Dr. J. E. Gray, I have 
examined, described, and illustrated the two following Sponges 
belonging to the British Museum. Both a appear to me to be 
new, and one the type of a new genus. The former is a 
Teth, a, and, from its dark purple colour externally, will be 
designated « atro-purpurea ;” and the latter, from its asperity 
externally, will be generically termed * Trachya,” and speci- 
fically * pernucleata," from the number of nucleated groups of 
spicules internally. 
et us direct our attention to the former first. 
Tethya atro-purpurea, mihi. Pl. XIII. figs. 1-10. 
Sessile, subcircular, kg compressed, muricated exter- 
nally, presenting a ra diate ructure inferiorly, where it ap- 
a 
ae m of radiated structure consisting of long, 
straight Rete s Mess in vemm from the centre of the 
