PORIFEBA (SPONGES). 



II. TETRAXONIDA, DENDY (6. P . 



BY R. KlRKPATRICK. 



(Plates VII I. -XXVI.) 

 I. GRADE TETRACTINELLIDA, MARSHALL. 



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

 Tetractinellida, belonging to four species of Tetillidni 1 , all of which have been 

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



The bulk of the material consists of numerous and large specimens of Ciiinr/ti/ni 

 Ixirbata Sollas, a species which was originally obtained from Kerguelen by tin- 

 ' Challenger,' 



The following is a list of species : 



Craniella sagittu (Lendunfeld) var. microsttji(t var. n. 

 CranieUa sugiltrt var. i>ai-li>/rrli<iMux var. n. 

 f'ranieUii hpludrrnifi (Sollas). 

 Ginarlrym larbata Sollas. 

 Cinachyra vertex Lenclenfeld. 

 Cinai'lii/ra vrrt/'j: var. inoiit<n<lnrix var. n. 



SUB-ORDER SIGMATOPHORA, Sollas. 



FAMILY TKTILLIDAK, Sollas. 



( 'KANIELLA, Sollas. 



Ti'til/iilfit' without porocalyces, and with a cortical skeleton of oxeas arranged inure 

 or less radially and vertically to the surface. 



CRANIELLA SAGITTA var. microsigma. 

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

 1907. Tc.lJiyii- sagitta Lendcnfeld (lla. p. ::nn). 



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 



