36 NATURAL HISTORY OP 



DESCRIPTIONS OF THE YAPJOUS BRITISH 

 HYDROIDA. 



Sub-Order : ATHECATA, Hinchs. 

 (Gymnoblastea, Allman.) 



FAMILY I. CLAVID^. 



Polypites claviform or fusiform, with scattered filiform 

 tentacula. — T. H. 



Prof. Allman excludes the genus Turris from this 

 order, and establishes for it the order Turridcey in 

 which the reproduction is by medusiform gonozooids. 

 In the Clavidce (Allman), which includes the remaining 

 genera, Clava, Cordylophora, and Tubiclava, the repro- 

 duction is by fixed sporosacs. The diagnosis above 

 given is sufficiently wide to include Turris. 



Genus I. Clava, Gmelin. {Clava, a club.) 



Polypites clavate, contractile, rising from a filiform 

 stolon with a chitinous polypai'y also investing the base 

 of the polypites. Tentacles scattered, smooth, nume- 

 rous. Reproduction by fixed sporosacs borne singly or 

 in clusters behind the posterior tentacles. — T. H. 



1. C. MULTicoRNis, Forslcdl. Plate II. fig. 1. 



Tubularia affinis (Turt.), Hydra multicornis [Forsk.), 

 Coryne squamata {R. Q. C, V. B., FL), Clava repens 

 {T. S. W.), Clava discreta {AIL), Coryne multicornis 

 {Lk., Tern., 0. J.) 



Hab. : Not uncommon between tide marks. Height, 



