134 Mr. H. J. Carter on Specimens 



covered here and there by the remains of a cribriform dermal 

 membrane charged with minute stellates. Pores producing 

 the cribriform structure of the dermal layer. Vents in groups 

 or scattered singly here and there. Internal structure the 

 same as that last mentioned, thickening towards the axis of 

 the cylinder. Spicules of seven forms, viz. : — 1, zone-spicule, 

 with trifid arms expanded at right angles to the shaft, which 

 measures 160 by 4-1800ths, and head 24-1800ths in diameter 

 (fig. 31, a) ; 2, body-spicule, acerate, curved, smooth, fusi- 

 form, 126 by 4-1800ths (fig. 31, b); 3 and 4, fork and anchor, 

 arms respectively about 4-1800ths long (fig. 31, c) ; 5, sili- 

 ceous globule, 10 by 8-1800ths long (fig. 31, d)-, 6 and 7, ex- 

 ternal and internal stellates respectively, the former l-6000th 

 and the latter 8-6000ths in diameter (fig. 31, e and/). The 

 zone-spicules have their heads in the petrous crust, which is 

 1-1 6th inch in diameter. Size of largest specimen about 

 5 inches long, largest part of cylinder -J- inch in diameter. 



Hab. Marine. Free or attached. 



Log. Gulf of Manaar. 



Obs. This species, besides differing from the rest in shape, 

 has larger siliceous globules and larger internal stellates. It 

 is more or less covered by detritus (bits of shells &c.) and 

 small calcareous organisms, which have become attached to 

 and grown upon it, respectively, during the time it has been 

 carried about by currents at the bottom of the sea. 



Geodia globostelltfera, n. sp. (PI. VI. fig. 38, a-f.) 



Globular. Colour grey. Surface more or less covered 

 with detritus as in the last species. Spicules of seven forms, 

 viz. : — 1, the zone-spicule, with trifid thin arms expanded 

 laterally at right angles to the shaft, which is 122 by 

 li-1800ths, and head 36-lS00ths in diameter (PL VI. fig. 38, 

 a) ; 2, body-spicule, acerate, curved, smooth, fusiform, 170 

 by li-1800ths (fig. 38, b) ; 3, fork (no anchor could be 

 found), arms 8-1800ths long (fig. 38, c) ; 4, siliceous globule, 

 spheroidal and oval respectively, about 5-1800ths in diameter 

 (fig. 38, d) ) 5, globe-stellate, consisting of a spherical body 

 covered with short conical points or rays, l|--1800th in 

 diameter (fig. 38, e and g) ; 6 and 7, external and internal 

 stellates respectively, the former l-6000th and the latter 

 8-6000ths in diameter (fig. 38, /and h). Spicules arranged 

 as in the foregoing, and the globostellate mixed up with the 

 siliceous globules of the petrous crust. Size of specimen 

 about | inch in diameter. 



Hab. Marine. Free or attached, 



Log. Gulf of Manaar. 



