1881.] THE SURVEY OF H.M.S. 'ALERT.' 47 



description and figures, except that the two oral spines are not 

 observed, that the lamina appears (perhaps delusively) to be often 

 calcified at its margin, and that the ocecium has a rather thick front 

 edge, which is mesially pointed. 



Hab. Hotspur Bank (off Brazilian coast, long. 3.5° 46' W., lat. 

 17° 32' S.), 35 fathoms. 



Cribrillina radiata, Moll. 



" Eschara radiata, Moll, Seerinde." 



Cribrillina radiata, Hincks, Hist. Brit. I\Iar. Polyz. p. 181, 

 pi. XXV. figs. 1-9. 



Of the •' form radiata " of Hincks, op. cit. p. 188, with glisten- 

 ing surface, and well represented by pi. xxv. fig. 3, op. cit., except 

 that a single pore below the mouth is the rule, instead of the 

 two small ones there represented. 



Hab. Victoria Bank, off S.E. Brazil, 33 fathoms, on Oellepora. 



Gigantopora, g. n. 



Growth encrusting. Zooeciasalient, ventricose, minutely roughened 

 and punctured. Above true mouth, which is terminal, not hori- 

 zontal, is an enlarged tubular prolongation of the peristome directed 

 upwards and outwards, terminated by a secondary aperture; an 

 avicularium or vibraculura at one or both sides of this. On front 

 face of zocecium proper a large roundish special pore at least half as 

 broad transversely as the cell itself. 



Gigantopora lyncoides, sp. u. (Plate VI. fig. 3.) 



Zooecia grouped round a centre, in contact with those in front of and 

 behind them ; ventricose, surface ghstening, minutely roughened and 

 punctate. Special pore at about middle of front of cell, transversely 

 elongated, with projecting smooth lips, rounded at ends, equal in 

 transverse diameter to at least half that of the cell itself. Peri- 

 stomial neck ventricose, diminishing in diameter from middle towards 

 the secondary orifice ; roughened similarly to the cell ; bent forward 

 at an angle of about 30°, flattened from front to back ; rim thick, 

 prolonged before and behind into angular point ; on edge of each 

 lateral depression a pear-shaped opening, in which is inserted a 

 horny vibraculoid seta, ending in a fine point, equal in length to about 

 that of the peristomial neck, projecting straight upwards in same 

 direction as the neck. Ocecium small, globose, recumbent at back 

 of cell proper, punctate. 



Full length of cell about 1-0G.5 millim., extreme breadth (at lower 

 end) about •532 millim. 



Examined. In the dry state. 



Hab. Victoria Bank (off S.E. Brazil), 33 fathoms. On aNullipore 

 incrusting a small univalve shell, and bearing many strong processes, 

 between which the small zoarium of about 20 cells lies. 



Obs. Under this genus must also be ranked Hippothoa fenestvata, 

 Smitt («' Flor. Bryoz.," Sv. Akad. Handl. xi. No. 4, p. i7, pi. vi. 



