378 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



respect to certain features. I follow the common practice and main- 

 tain both genera (for some discussion of this matter, see George and 

 Wilson, 1919, and previously under Tetilla). In the following list 

 Lendenfeld's practice must be borne in mind. 



Since Lendenfeld's Tierreich synopsis (1903) there have been 

 described — 



C. elegans Dendy, 1905, p. 95, Ceylon. 



Tethya coactifera Lendenfeld, 1906, Kerguelen. 



Tetkya stylifera Lendenfeld, 1906, Kerguelen. 



Tethya crassispicula Lendenfeld, 1906, Kerguelen. 



Tethya armata Baer, 1906, Zanzibar. 



Tethya sagitta Lendenfeld, 1907, p. 307, Antarctic. 



C. disigma Topsent, 1904, p. 100, Azores. 



C. sagitta Lendenfeld, var. microsigma Kirkpatrick, 1908, p. 1, 

 Antarctic. 



C. sagitta Lendenfeld, var. pachyrrhabdus Kirkpatrick, 1908, p. 4. 



A few species assigned by Sollas and others to CranieUa {Tethya) 

 are inscribed by Lendenfeld, 1903, under Tethyopsilla. 



CRAN1ELLA SIMILLIMA (Bowerbank). 



Plate 40, fig. 1. 

 Tethea simillima part Bowerbank, 1873, p. 15. 

 CranieUa simillima (Bowerbank), Sollas 1888, p. 30. 

 Tethyopsilla zetlandica (Caeter) part, Lendenfeld, 1903, p. 31. 



Station D5151, one specimen; D5164, one specimen; D5141, one 

 specimen. 



Sollas, 1888, discusses Bowerbank's description and type, and re- 

 defines the species as subspheroidal with terminal osculum and conu- 

 lose surface; the conules absent over the base, here replaced by a 

 general pilosity. Without microscleres. Sollas' specimens came from 

 the Australian coast, the Philippines, and the vicinity of the Aru 

 Islands. The largest measured 29 by 27 mm. 



Lendenfeld, 1903 (p. 31), combines the species along with two 

 others of Sollas' under Tethyopsilla zetlandica (Carter), a form from 

 the neighborhood of the Shetland Islands, differing from the common 

 Atlantic CranieUa cranium in a negative character, the absence of 

 sigmas. Hentschel (1911, p. 287; 1912, p. 331) accepts T. zetlandica 

 in Lendenfeld's extended sense, and so designates two sponges, one 

 from the Australian coast, one from the Aru Islands. 



It seems to me desirable, for the present at least, to retain C. 

 simillima as an Indo-Pacific form, in which the general surface is 

 markedly conulose, while the base is pilose. Hentschel's sponges just 

 referred to, one of which measures 5 cm? in diameter, would perhaps 

 fall under C. simillima. In one, at any rate, the surface is distinctly 

 conulose. For the other this character is not given. 



