APOLEMIA. 127 



Of the i&mWy oi Apolemiadce, and of the genera Halistemma and Forskalia, I have seen no 

 specimens, but to render this work more useful to future observers I add figures and descrip- 

 tions of them, borrowed from the works of Gegenbaur, Kolliker, and Leuckart. 



Fam. APOLEMIADiE. 



Genus APOLEMIA. {Eschschoh.) 



The pneumatophore is small ; the hydrophyllia lanceolate in outline and curved, so that 

 their proximal sides are convex. 



Apolemia uvarta {Eschschoh). PI. XII, fig. 8. 



Stephanomia uvaria, Peron and Lesueur, 1807. 



Gegenbaur, whose figure of this species I have copied, gives so excellent an account of 

 its structure (Beitriige, p. 37), that I cannot do better than transfer it (with a little condensa- 

 tion and borrowing here and there from Leuckart) to my own pages. 



The nectocalyces are disposed in two lateral series of three or four in each, and 

 constitute an oval mass, measuring altogether about an inch and a half in length. They 

 have the form of a truncated cone whose basal edges are rounded off. The aperture of 

 the nectosac, which resembles a broad-bodied bottle, and occupies the greater part of 

 the nectocalyx, is situated at the apex of the cone. 



The pyriform pneumatophore is wholly devoid of pigment. 



Scattered, filiform, and very contractile hydi-ocysts are attached to the coenosarc between 

 the nectocalyces, beyond which the coenosarc is cylindrical, a line to a line and a half in 

 thickness, and carries at regular intervals (of about two inches) the plume-like groups of 

 polypites and other appendages ; so that the whole colony, approximating towards the type of 

 the Calycophorido', consists of similar segments. Attached to the coenosarc, immediately behind 

 the nectocalyces, is a compact bundle of young undeveloped organs, which, by the subsequent 

 outgrowth of particular parts of the coenosarc to which they are attached, become separated 

 into distinct bundles. 



Each group of organs is, according to Leuckart (' Z. N. K.,' p. 67), attached by a distinct 

 peduncle, and consists proximally of a number of hydrophyllia, succeeded by two or three 

 polypites and a great number of vermiform hydrocysts, at the base of each of which is a 

 simple tentacle. The hydrophyllia are ovate or clavate bodies, a few lines in length, which 

 are attached to the coenosarc by short peduncles. The larger ones are slightly curved, so as 



