1881.] THE SURVEY OF H.M.S. 'ALERT.' 55 



of calcareous substance, is button-like in shape, agrees in its ma- 

 millation with the type specimen, but, instead of being white or 

 grey, is dark brown, almost of the colour of C. fusca, Busk. It dif- 

 fers from the type in not showing the hood-like enlargements of the 

 rostrum (possibly ocecia) which occur °at intervals in that spe- 

 cimen ; the rostra taper elegantly to a point, instead of being blunt ; 

 the spines, described as at the opposite side of the mouth, and which 

 appear to be " spathulate " avicularian rostra, are present in much 

 greater numbers here, and generally at the sides of the mouth — not 

 at the opposite end to the rostrum. The surface of the cell is per- 

 forated by immense numbers of small punctures with regularity ; 

 this is also the case in the type specimen, though not described or 

 figured in loc. cit. As the original specimen has somewhat the ap- 

 pearance of having been partially bleached, its original colour very 

 likely approximated to that of the specimen now described. 

 Hab. Victoria Bank, off S.E. Brazil, ^^3 fathoms. 



Cellepora turrita, Smitt. 



Lepralia turrita, Smitt, Floridan Bryozoa, in K. Svensk. Akad. 

 Handl. (n. s.) xi. p. C5, pi. xi. figs. 226-228. 



A single specimen, consisting of a stout cylindrical branch with 

 incipient smaller branches, 17 millims. long by 5 in greatest breadth, 

 stout, tapering to a blunt point. The number of distinct marginal 

 tuberosities varies from two to four ; and they are unequal in size, one 

 being generally of especial stoutness ; and one, a mere inequality, 

 bears a horizontal avicularium of some size ; the large strong spa- 

 thulate avicularia are numerous in the somewhat large spines between 

 the zocecia, and occasional small sessile ones occur in the walls of the 

 cells ; the ovicells, which are numerous, bear small scattered punc- 

 tures. 



This form differs somewhat from Smitt's specimens, chiefly in the 

 ramose instead of sessile habit ; the cells appear to be less crowded, 

 and the number of spines less constant, while the marginal avicula- 

 rium forms a constant character. 



Hab. Victoria Bank, off S.E. Brazil, 33 fathoms ; broken from 

 larger colony. 



Cellepora dichotoma, Hincks. 



Cellepora dichotoma, Hincks, Ann. N. H. ser. 3, ix, p. 305, pi. xii. 

 figs. 7, 8. 



Two specimens, respectively about | and f inch high. The smaller 

 is the more slender, and shows approximately dichotomous branching; 

 the other is less regular. In the smaller one the margin of the 

 mouth is well defined, though sometimes produced into a lew points 

 besides the low rostrum ; the avicularia are circular and slightly ele- 

 vated. In the larger specimen the projections round the mouth are 

 longer, and the avicularia are sometimes spatulate. 



flab. Victoria Bank, S.E. Brazil, 33 fathoms. 



