146 THE VOYAGE OF H.M.S. CHALLENGER. 



Pourtales gives a good figure of this species (58, pi. ix. fig. 8), from which it is 

 seen that the branches are slender, and bear verticillate or biverticillate pinnules in a 

 most characteristic manner. 



Habitat. — Off Guadeloupe, 35 to 50 fathoms (Duch.). Occurring at sixteen stations 

 in depths from 73 to 861 fathoms, off Guadeloupe, Martinicpe, Dominica, Virgin Gorda, 

 St. Lucia, St. Vincent, the Grenadines, and Barbadoes (Pourt.). 



Subfamily Schizopathin^e, Brook. 



Antipathidae possessing dimorphic zooids. The dimorphism consists of a differ- 

 entiation of the typical Antipatbid zooid into three zooids, of which an anterior and 

 posterior (as arranged on the sclerobasic axis) are reproductive, and may be termed 

 gonozooids. The central one of each group is nutritive, and may be conveniently named 

 the gastrozooid. 



The gastrozooid has the usual arrangement of mesenteries found in the Antipathinse ; 

 the gonozooids have only one mesentery each, situated in the transverse axis. This 

 represents the distal portion of the much elongated transverse mesenteries in some 

 Antipathinse, e.g., Parantipathes. Each zooid possesses two tentacles, so that each 

 group of three has the proper number of tentacles characteristic of the Antipathidag. 

 The zooids may be closely packed, or situated at some distance from one another. 



The species at present known, which are referable to this subfamily, have nearly all 

 been obtained at great depths, and in all, the spines on the axis are of the triangular or 

 subtriaugular type. 



Synopsis of Genera. 



A, Corallum consisting of a simple stem, bearing elongate, simple, and usually lateral 



branches ; spines short and conical, extending at right angles to the axis, 

 a. Base free, flattened and tapering, hooked up at the extremity; zooids crowded; 



stomodaeum elongated in the sagittal axis, ..... Schizopathes, n. gen. 

 j3. Base dilated and adherent ; zooids always isolated, .... Bathypathes, n. gen. 



B. Corallum much branched ; spines longer and hooked upwards. 



o. Corallum consisting of an erect stem with strong branches at right angles, bear- 

 ing six rows of pinnules in two opposite half spirals ; zooids somewhat isolated ; 

 mesogloea thin ; stomodajum elongated in the transverse axis, . . Taxipathes, n. gen. 



ft. Corallum in plumose branches, with numerous short circumaxial pinnules ; 

 zooids crowded ; stomodasum very long and irregular ; mesoglcea thick ; only 

 six mesenteries present in the oral prominence, .... Cladopathes, n. gen. 



Genus Schizopathes, n. gen. 



The dimorphic zooids are always close together in normal portions of the colony, and 

 there is no isolation of the zooids into triplets. The degenerate zooids near the base 



