LIST OF LABRADOR MARINE ANIMALS. 409 



than in B. mirabilis. More important differences exist in the 

 diameter of the cell being greatest at the distal or anterior third 

 of the cell, where in the British species it is thickest posteriorly ; 

 and in our species the aperture opens near the end of the cell. 

 It occurred rarely on Pecten in 50 feet. 



Cellularia Peachii Johnst. ? With the preceding. Rare. 



Menipea ternata Busk ? Bare. 



M. frutlcosa n. sp. (Fig. 3.) This fine species grows an inch 

 in height, with large wide branches, dividing dichotomously. 

 The cells are large and long, being attenuated downwards. 

 Above they are truncated, with four spines, two upon each side, 

 and invariably with an outer projecting spine, when the others are 

 absent. The upper valve is long, oval and sunken ; aperture 

 transversely linear, closed by a square incomplete lid. Cells con- 

 tiguous, arranged in two alternating rows, with two or three median 

 ones before the origin of the branches. The avicularia have long 

 beaks, and are arranged sparsely at the base of the median cells. 

 Long vibracala arise near the front of a few lower valves. The 

 ovi-capsules are globose and smooth. It is more nearly allied to 

 M. cirrata of Europe than any other species, though very distinct. 

 It is a common species, and occurs in Greenland, from whence I 

 have a specimen, 



Scrupocelhria Americana, n. sp. This species is closely 

 allied to S. scruposa, with specimens of which, collected by Dr. 

 Stimpson on the English coast, I have compared it. With much 

 the same habit, our species is twice as large and much more solid. 

 There are the same relative proportions in the form and size of 

 the cells, but in our species the avicularia are smaller in propor- 

 tion to the cell, and there is but a single spine surmounting this 

 appendage, the lip of the orifice being unarmed, while in S. scru- 

 posa two spines are very constantly present on the inner side of 

 the cell. The lids or upper valves, which in my specimens are 

 raised from the coenoecium by the relaxation of the muscles, are 

 convex, and somewhat rugose, owing to several slight transverse 

 lines. The ovi-cells are smooth and globose. . It is not unfrequent 

 on the Bank. 



Caberea Hookeri Bus"k? One species presents some differ- 

 ences from the British specimens in my possession collected by 

 Dr. Stimpson; and also from Mr. Busk's figures. It is abundant 

 in Labrador, and on the coast of Maine as far as Casco Bay. 



HalopMla borealis n. sp. (Fig. 4.) This species agrees 



