from Iceland and Labrador. 107 



tion) ; Greenland {AioUer and ToreU) ; Holsteinborg Har- 

 bour, 7-35 fathoms ; entrance of Baffin's Bay, 175 fathoms 

 (^ Valorous ' dredgings) ; Anticosti and Mingan Islands ; 

 South Labrador {Packard).'] 



In this very distinct species, the small oval avicularia are 

 sometimes placed on each side of the mouth at the top, or 

 sometimes on one side only : occasionally they occur about 

 the middle of the aperture ; they are also distributed irregu- 

 larly over the zoarium. In many cases they are wanting 

 altogether in connexion with the mouth of the cell. 



Genus Retepoea, Imperato. 



25. Betepora IFa/Z/c7«awa, n. sp., Busk (MS.). 

 (PI. XL figs. 9-13.) 



Retepora cellulosa (Linn.), forma notopaclnis (Busk), var. elongata, 

 Smitt, I. c. pt. iv. pp. 36 & 204, pi. xxviii. figs. 226-232. 



Zoarium irregular, sometimes giving off long free branches ; 

 fenestrce elongate, narrow, lozenge-shaped. Zoooecia immersed, 

 elongate, somewhat rectangular, bordered by lines, the mouth 

 suborbicular ; peristome thin, raised, the inferior margin pro- 

 jecting and with a very minute central sinus ; immediately be- 

 low it in many of the cells a prominent rostrum placed obliquely, 

 bearing on its summit a large avicularium with strongly in- 

 curved beak and a long triangular mandible pointing down- 

 wards. Oooecium small, rounded, smooth ; placed very far 

 back behind the mouth and separated from it, in the centre of 

 the arch of the opening, a small denticle (Plate XL fig. 12). 



This form has been very accurately described by Smitt ; 

 but he regards it as a variety of the Crag species B. noto- 

 pachys^ Busk. Some years since Mr. Busk, who had met with 

 it amongst Dr. Wallich's dredgings, gave it the MS. name 

 which I have retained in this paper, and which fittingly 

 commemorates one of the earliest and ablest pioneers in the 

 work of deep-sea exploration. I agree with Mr. Busk that it is 

 specifically distinct, though in some respects it seems to approach 

 the fossil form. The chief points of difference between it and 

 B,. notopachys are to be found in the mouth, which in the latter, 

 according to Busk's figure, is furnished with a rather deeply 

 incised sinus on the lower margin, whereas in B. WallicMana 

 the sinus is very minute and shallow* — and in the ovicell, 

 which in the last-named is small, with a very moderate orifice 

 and a conspicuous denticle in the centre of the oral arch, while 

 that of the Crag form is described as large and open in front. 



The position of the ovicell in the present species is also 



• The contour of the oral aperture is very different in the two species. 



