POEIFEEA (SPONGES). 



II. TETEAXONIDA, dbndy (6. p. 63). 



By R. Kirkpatrick. 



(Plates VIII.-XXVI.) 



I. Grade TETRACTINELLIDA, Marshall. 



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

 Tetraetinellida, belonging to four species of Tetillidae, 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 

 harhata SoUas, a species which was originally obtained from Kerguelen by the 

 ' Challenger.' 



The following is a list of species : — 



Craniella sagitta (Lendenfeld) var. microsigma var. n. 

 Craniella sagitta var. pachyrrJiahdus var. n. 

 Craniella leptoderma (Sollas). 

 Cinachyra barbaia Sollas. 

 Cinachyra vertex Lendenfeld. 

 Cinachyra vertex var. monticularis var. n. 



Sub-Order Sigmatophora,. Sollas. 



Family Tetillidae, Sollas. 



Craniella, Sollas. 



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

 or Ibss radially and vertically to the surface. 



Craniella sagitta var. microsigma. 

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

 1907. Tethya sagitta Lendenfeld (11a. 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 

 0*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 



