132 MR. C. W. ANDREWS AND OTHERS ON THE [Feb. 20, 



pores being in the grooves between the lamellae; the pattern is not 

 present on the thick rounded edges nor on the nodular excrescences. 

 Several small oscules lx - 5 mm. are present. 



The specimens described by Sollas and Lindgren are probably in 

 an early stage of growth. 



There are considerable variations in the dimensions of the 

 spicules, a.s will be seen from the table (p. 131 J giving the sizes in 

 microns. 



Distribution. China Sea ; Torres Straits ; Christmas Island. 



Tetilla bacca (Selenka). 



1867. Stelletta bacca Selenka (15. p. 569, pi. xxxv. figs. 14-15). 



1888. Tethya rnerguiensis, Carter (2. p. 36H, pi. xv. figs. 6-8). 



1898. Tetilla bacca Lindgren (10. p. 828). 



There are two specimens, the larger being 2*5 c.c. x 3*5 c.c. 

 They are subspherical, but with a concave area below apparently 

 resulting from radial fission. The larger specimen has 20 oval 

 depressed pore-areas and 2 oscules, all being about 4x 5 mm. in 

 area and 2-5 mm. in depth. The oscules are cloacas, in the floor of 

 which several openings of excurrent canals are seen ; the floor of 

 the pore-areas is covered with membrane perforated by groups 

 of pores. A section of the sponge, which is soft and cuts easily, 

 shows bundles of spicules radiating from a central nucleus. 



The spiculation is almost identical with that of a specimen from 

 Java described by Lindgren. The length of the oxea is 3'5 mm., 

 of the anatrisenes 5*5 mm. and of the protriaenes 52 mm. 



Distribution. Samoa ; Torres Straits ; Amboina ; Java; Mergui; 

 Christmas Island. 



Tetilla ternatensis Kieschnick. 



1896. Tetilla ternatensis Kieschnick (7. p. ■i~~). 



1898. Tetilla ternatensis Lindgren (10. p. 329, pi. xvii. fig. 14, 

 pi. xix. fig. 2o). 



The one specimen is subspherical, 2x2x3 c.c. in size; the 

 sponge is deeply fissured in several places. There are several 

 oscules, the largest being 3 mm. in diameter and possessing a raised 

 rim. As in Lindgreu's specimen, the surface of the sponge is 

 crowded with Diatoms. 



The very rare protrieenes are irregular, one of the arms being 

 much longer than the other two, which may be reduced to mere 

 knobs. 



This species resembles T. dactyloidea Carter in certain respects, 

 the radiating bundles of the latter being formed of oxea (I860 x 6u) 

 midway in size between the large oxea and microxea of T. terna- 

 tensis. 



Tethya ingalli Bowerbank. 



1872. Tethya ingalli Bowerbank (1. p. 119, pi. v. figs. 11-17). 



The single specimen is free, oval, 22 mm. in length, aud 16 mm 



