40 Rev. T. Hincks on the 



Family Porinidae. 

 Lagen{2:)ora sjiinulosa, n. sp. 

 [See page 31.] 



When I first described this species I had only met with 

 small incrusting- colonies, and was under the impression that 

 they represented the mature and perfect form. I now find, 

 however, that this is by no means the case. When fully 

 grown the zoarium of Lagenipora spinulosa is erect and ra- 

 mose (PI. IX. fig. 4), consisting of a cylindrical stem, which 

 divides and subdivides dichotomously, the branches termina- 

 ting above in short bifid segments. The zocecia are arranged 

 longitudinally in six lines along the stem and branches, those 

 in neighbouring lines alternating; the oral (or neck-like) 

 portion free and projecting, tlie lower immersed. The surface 

 of the cell is covered with very large foramina, which are 

 closed in by membrane. Primary orifice elliptical, slightly 

 narrowed below. The surface of the ocecium is smooth, and 

 entire behind ; a raised line arches across it towards the front, 

 and the portion in advance of this line is covered with minute 

 disks closely packed together. 



In its perfect condition this species bears a close resemblance, 

 so far as habit and general appearance are concerned, to an 

 Entalophora. 



The wall of the cell is built up of tubes placed longitudi- 

 nally and closely appressed to one another ; this curious 

 structure may be best observed in the erect neck-like portion 

 of the zooecium. The superficial foramina are probably the 

 openings of the tubes. 



The lateral avicularia are supported on a tubular structure, 

 which may be traced stretching down the inner wall of the 

 oral cylinder (neck) and tapering off finely below. Lageni- 

 pora spinulosa would seem to be abundant where it occurs ; 

 it must be accounted one of the most interesting forms which 

 Dr. Dawson's dredgings have yielded. 



Family Myriozoidse (part.). 

 SchizoporeUa cruenta, Norman. 



This species must be added to the list of North-Pacific 

 forms. The single specimen which occurs is in fine condition, 

 and has the oral sinus much more strongly marked than the 

 British examples which I have examined. The deep-red 

 colour of the zoarium when fresh has given place to a uniform 

 black. 



[Nova Zembla, Greenland, Britain, from Shetland to the 

 Channel Islands.] 



