254 ZOOPHYTOLOGY. 



and that other wide-spread species, though extending through 

 the torrid, despise the utmost rigours of the Arctic zone. 



The arrangement of the Polyzoa, which it is purposed here 

 to adopt, is that according to which the marine Polyzoa are 

 disposed in the catalogue of those in the British Museum, 

 drawn up by Mr. Busk ; the names of already-known species 

 are those there employed, where also figures of every species, 

 and the synonymy will be found. 



Class. POLYZOA. 

 Order I. P. infundibulata. 

 Sub-order 1. Cheilostomata, 

 § 1. Articulata. 

 §§ 2. Bi-multiserialaria. 



1. Fam. Salicornariad^. 



1. Gen. Salicornaria, Cuv. 



1. S. borealis, n. sp. PI. I., fig. 1, 2, 3. 



Front of cell elongated, slightly contracted below, arched above ; surface 

 and raised margin smooth ; avicularium on the front of the cell near the 

 bottom ; mandible triangular, acute, pointing downwards. 



Hab. West Greenland, 73° 20' N. 57° 20' W., 6 to 10 fms. Dr. Suther- 

 land. 



A very distinct and well-marked form. The polyzoary, which is com- 

 posed of club-shaped internodes, varying greatly in size, is irregularly 

 dichotomous, and from one to two inches in height. 



Fam. Cellulariad^. 



2. Gen. Menipea, Lamx. 



1. M. arctica, n. sp. PI. I., fig. 4, 5, 6. 

 Cells 3 — 9 in each internode, rhomboidal ; aperture oval, contracted 

 below ; a marginal spine on each superiorly : central cell at a bifurcation 

 mucronate at the summit. Ovicell smooth. 



Hab. W. Greenland, 73° 20' N. 57° 20' W., 6 to 20 fms. Assistance 

 Bay, 74° 50' N. 94° 16' W., 15 fms. Dr. Sutherland. 



This species, which at first sight much resembles a Cellularia, differs 

 from all its congeners with which I am acquainted in the absence of any 

 avicularium on the anterior aspect of the cells. The lateral avicularium 

 is also frequently absent, and fragments thus unfurnished could only be 

 distinguished from the genus Cellularia by the rhomboidal form of the 

 back of the cells, and the absence of the perforations which exist on the 

 back of the cells in all species properly belonging to that genus. 

 Gen. 3. Scrupocellaria. 

 1. S. scrupeaf B. M. Cat., p. 24. PI. XXL, fig. 1, 2. 

 Hab. Arctic sea. Sir E. Belcher. 



The determination of this form having been made from only a very 

 minute specimen, growing on the inside of a valve of Terebratula j^sittacea, 

 is not absolutely certain, but I have little doubt of its correctness. 

 § 2. Inarticulata sen continua. 

 §§ 1. Uniserialaria. 

 Gen. 4. Hippothoa, Lamx. 

 1. ff. divaricata, Lamx. B. M. Cat., p. 30. PI. XVUL, fig. 3, 4. 

 Hab. Arctic sea. On valve of Terehrattila psittacea. Sir E. Belcher. 



