196 Scientific Proceedings, Royal Dublin Society. 



(3) globate, shaped like a finger biscuit, or shuttle-shaped, or 

 lozenge-like, surface granulated, 014 by 0*032, to 0175 by 

 0*026 mm., or narrower and longer, 02 by 0*024, or shorter and 

 wider, 0122 by 0-048 mm. ; thickness, from 0*008 to 0*01 mm. ; 



(4) fusite, 0-07 by 0*006 mm. ; (5) large stellate, with few rays, 

 0*063 mm. in diameter, a single ray, 0*032 mm. long ; (6) small 

 stellate, a small centrum, and numerous short rays, truncated, or 

 capitate at the ends, 0*016 mm. in diameter. 



Habitat. — Bahia. 7-20 fms. 



Caminus sphmroconia, sp. n. — Sponge massive, with massive 

 vertical lobes, attached ; oscules on summits of lobes, large, leading 

 into large cloacas ; pores in sieves, roofing incurrent chones. 

 Spicules — (1) acerate, 0*5 by 0*016 mm. ; (2) fork, shaft, 0*32 by 

 0*016 mm. ; arms simple, 0*2 mm. long; (3) globate, 0*0553 mm. 

 in diameter ; (4) globule, a minute, smooth sphere, 0*004 mm. in 

 diameter ; this serves both as ectaster and endaster ; colour, purplish 

 when exposed to the light ; yellowish below. 



Habitat. — Bahia, shallow water. 



This sponge is very similar to Caminus vulcani, O. S., which 

 also contains true forks and globules ; it differs by the absence of 

 stellates, which are present in C. vulcani, and by the less length of 

 its acerate spicules (0*08 by 0*016 mm. in C. vulcani), and by the 

 smaller size of the globule (0.1 mm. in diameter in C. vulcani). 

 The cortex is about 0*8 mm. thick, and consists of an ecto- cortex 

 formed of vesicular tissue, 0*05 to 0*24 mm. thick, of a globate 

 layer, 0*65 mm. thick, and an inner fibrous layer, 0*05 to 0*08 mm. 

 thick. 



Cydonium glariosus, sp. n. — Sponge, more or less spherical, 

 attached ; the collenchymatous ecto-cortex is crowded with coarse 

 grains of sand, and traversed by pencils of short acerates, which are 

 entirely confined to it. Spicules — (1) acerate, 1*86 by 0*026 mm. ; 

 (2) small acerates of the cortex, 0*35 to 0*4, by 0*016 mm. ; (3) fork, 

 shaft, 2*86 by 0*052 mm. ; arms simple ; (4) second form of fork, 

 shaft, 5*36 by 0*03 mm. ; arms simple, 0*08 to 0*11 mm. long ; 



(5) anchor, shaft, 4*65 by 0*012 mm. ; rays, 0*08 mm. long ; 



(6) globate, spherical, 0*05 to 0*058 mm. in diameter; (7) ectaster, 

 small centrum, short rod-like rays, 0*01 mm. diameter; (8) en- 



