POEIFERA (SPONGES). 



H. TETEAXONIDA, BENDY (8. P . 63). 



BY R. KlRKPATRICK. 



(Plates VIII.-XXVI.) 

 I. GRADE TETRACTINELLIDA, MARSHALL. 



IN the collection made by the ' Discovery ' there are fifty-nine specimens of 

 Tetractinellida, belonging to four species of TetiUidae, all of which have been 

 described before ; and, further, there are new varieties of two of the species. 



The bulk of the material consists of numerous and large specimens of Cinachyra 

 barbata Sol las, a species which was originally obtained from Kerguelen by the 

 ' Challenger.' 



The following is a list of species : 



Craniella sagitto (Lendcnfeld) var. mitrosigma var. n. 

 Craniflla lagitta var. pofhyrrhabdtu var. n. 

 CnmMa leptodtrma (Sollat). 

 Cinachyra barbata Bellas. 

 Cinachyra vtrtex Lendcnfeld. 

 Cinachyra vtrtex var. montiruliri* var. n. 



SUB-ORDER SIOMATOPHORA, Sollas. 



FAMILY TETILLIDAK, Sollas. 



CRANIELLA, Sollas. 



TetiUidae without porocalyces, and with a cortical skeleton of oxeas arranged more 

 or less radially and vertically to the surface. 



CRANIELLA SAOITTA rar. microsigma. 

 (Plate VIII., figs. 1-13, and Plate IX., figs. 15, 16.) 

 1907. Ttlhya tagitta Lendenfeld (11 a. p. 306). 



Sponge large, pyriform or cocoanut-shaped, narrowed and truncate at lower end, 

 with finely pilose surface and with root-tuft With a few small circular oscules about 

 75 mm. in diameter in the contracted state. The body divided into three zones, an 

 inferior root-tuft zone, a broad median or equatorial poral zone, and a superior oscular 

 zone. Surface, where the pile has been denuded, showing obscurely-marked longitu- 

 dinal anastomosing ridges, much more evident in the poral region. Pores in sieve-like 



2 A 2 



