272 SIltNKY F. HARMER. 



9. S. buskii, n. sp. Figs. 13, 33—35. 



Membranipora maguilabris (part), Busk, ' Brit. Mus. 

 Cat.,' ii, 1854, p. 62. 



B zooecia much less than twice as large as a zooecia. 

 Cryptocyst descending gradually and slightly, without angu- 

 lation, joining the distal wall at a high level. Median process 

 wide and short in a zocEcia, much narrower in b, its distal 

 border usually produced into projecting points ; its cavity 

 shallow, limited beneath by the descending cryptocyst, and 

 distally by the roof of the tube. Opening of tube nearly 

 horizontal, entirely visible from above, completed by the 

 distal wall in both a and b. Oral shelf not mnch more de- 

 veloped in B than in A. b opercula with A-shaped main 

 sclerite, with numerous small submarginal teeth, sometimes 

 vestigial, the series beginning near the proximal end of the 

 operculum. Parallel portions of the halves of the main 

 sclerite of moderate length, the arch formed by the proximal 

 parts wide and evenly rounded, a opercula undifferentiated. 



(a) Port Elizabeth, Cape Colony, Miss E. C. Jelly 

 (C. M., 24.5.95). 



{h) Algoa Bay (three slides), Busk Coll. (B. M., 99.7.1, 

 404—406). 



{cj Shahr, South Arabia (B. M., 94.6.13, 7a). 



{d) Reef in Talisse Island, North Celebes, Professor 

 S. J. Hickson (C. M.). 



(e) Thursday Island, Torres Straits, four fathoms, 

 H.M.S. " Alert " (B. M., 82.2.23, 512). 



(/) Australia (B. M., 50.8.23, 9). 

 This species is named in honour of Mr. Busk, to whom the 

 first description of a species of Steganoporella is due. 

 The examination of the three slides (h) from Mr. Busk's col- 

 lection in the possession of the British Museum shows that 

 the original description of S. magnilabris (but not the 

 figure) was based on two distinct species. 



