MUCRONELLA. COCCINEA. 371 



Colonies often exhibiting an irregular outline, and giving 

 off branching processes, three or four cells wide. 



HABITAT. On small stones from deep water. 



LOCALITY. Shetland sea, 20-25 miles N. and N. by W. 

 of Unst, in 80-140 fathoms (A. M. N.) . 



GEOGRAPHICAL DISTRIBUTION. On the Falmouth-Lisbou 

 cable, between N. lat. 47 58' and 47 35' and inW. long. 

 7 6', from 89-205 fathoms (Sir James Anderson) . 



In this species the cells rise considerably towards the 

 upper extremity, and are produced into a short neck, which 

 is quite free, and bears the mouth on the top of it. The 

 lower part or body of the cell is ovate. The mouth is 

 small, and as it were drawn out sideways, so as to be 

 transversely elongate. It is surrounded by a simple, 

 thickened peristome, which forms a " pouting lip " in 

 front, and above is more or less pointed. The cells are 

 without definite arrangement, are divided by well-marked 

 sutures, and, according to Mr. Norman, " rise from a 

 punctured crust, which fills up any interstices between 

 them." In the specimens which I have examined there 

 is very little trace of such a crust ; in most cases the cells 

 are contiguous. The ovicell is recumbent and set well 

 back behind the neck, and, like the cells, is almost smooth 

 or very minutely granulated. 



This is one of the species which it is very difficult to 

 classify with any thing like certainty. It holds its place in 

 the present genus chiefly from its apparent affinity to M. 

 abyssicola. 



b. With two lateral avicularia. 



MUCRONELLA COCCINEA. 

 Plate XXXIV. figs. 1-6. 



CF.LLF.PORA COCCINEA, Abildgaard, Mull. Zool. Dan. iv. 30, pi. cxlri. flg \ _ 

 Lamk. An. . Vert. ed. 2, ii. 259. 



