36 Mr. H. J. Carter on 



at one end tlian the other, which is lance-pointed *, altogether 

 about 13 by |-6000th in. in their greatest dimensions — 'in short 

 they form Hiickel's " Stabchenmortel," and are what I have 

 proposed to call " mortar-spicules." Of the terminations of the 

 long acerates of the tufts I know nothing, as they are all broken 

 off except a few of the shorter ones, which are simply pointed. 

 The most complete specimen of this species in Mr. Wilson's 

 collection is much compressed, about 1 in. long and | in. broad; 

 with a large peristome of glistening, silky, fine acerates now 

 arranged conically, altogether about 3-24ths in. in diameter 

 at the base and 5-24ths in. long, which, of course, is the 

 diameter of the mouth. 



10. Grantia subhisptda. 



Individualized. Sacciform, elongate, somewhat pyriform, 

 diminishing in size abruptly towards the free and gradually 

 towards the fixed end. Surface presenting a checkered 

 appearance owing to the presence of lines crossing each other 

 spirally and obliquely upwards, at the intersections of which 

 a tuft of long projecting spicules is situated, and in the inter- 

 vals a cribrate, stelliform area, arched outwards. Pores in the 

 dermal sarcode stretched over these cribriform areas, in short 

 the holes of the cribriform structure itself. Vent large, single, 

 terminal, subcircular or twisted, like a slit nostril ; surrounded 

 by a palisading of long linear spicules, leading into a cloaca 

 which corresponds in sliape to that of the specimen, and whose 

 surface is scattered over with holes separated by a thick spi- 

 cular framework ; holes not superficially sphinctered, but 

 presenting two or more sphinctered openings within the mar- 

 gin belonging to the internal structure. Wall composed of 

 radiating cylindrical chambers in juxtaposition, whose skeletal 

 structure is " articulate," tympanized with sarcode, pierced 

 by the usual pores of intercommunication, and more or less 

 accompanied by parenchymatous or intercameral intervals ; 

 outer ends of the chambers respectively covered by the spi- 

 cular tufts and cribriform areas, and their inner ends opening 

 in pairs, within the holes of the cloaca respectively, as before 

 stated. Spicules of three kinds, viz. acerate, triradiate, and 

 quadriradiate : — 1, acerates, of two forms, viz. one long, fine, 

 linear, straight and simple, pointed at each end, arranged 

 parallelly to each other around the mouth ; the other much 

 stouter, curved, simple or lanceolate at one end, chiefly 



* When the word " lance " is used with reference to the form of the 

 end of a spicule, it must be understood to mean lozenge-shaped or conical 

 as the case may be. 



