106 FLABELLIGERA. 



of sand-grains like the rest of the body. It varies in length in the females, some having 

 long, others short papillae. 



The ovaries are attached by slender pedicles to the ventral wall of the body on the 

 sixth, seventh, and eighth bristled segments, but a long pedicle enables a mass to lie in 

 the ninth. 



A curious crustacean parasite (Bradophila pygmxa) was found in the anterior part 

 of the alimentary canal of Brada villosa by Levinsen. 1 



This form appears to agree closely with the Trophonia arctica of Hansen (1882) 

 from Magdalena Bay, in 20 fathoms. He, however, describes the dorsal surface as 

 uniformly granulated, and the papillae on the ventral surface fewer and smaller. On the 

 whole, Hansen's form is smoother. 



It has certain resemblances to the Siphonostomum villosum of H. Rathke, though his 

 examples were small and short, probably incomplete. The special characters of the 

 ventral division of the foot and the somewhat stellate arrangement of the papillae around 

 each (when viewed on end), generally correspond. Unfortunately, he did not enter 

 minutely into the structure of the bristles or figure them. 



There are apparently two varieties of Brada villosa, viz. the shorter northern form 

 and the more elongated form from the 'Knight Errant' (Plate XOVI, fig. 6). Both 

 have the dense coating of sand-grains which, with the papillae, make the dorsum remark- 

 ably rugose, yet there are considerable differences in the shorter northern forms from 

 Finmark, some of which are much less covered with sand. Both have the genital papillae 

 exactly in the same position and of like shape, yet amongst those from Greenland and 

 from Finmark the length of these papillae varies, some having them short, others long, so 

 that sexual distinctions in this respect may exist. The number of segments in the shorter 

 northern form is about twenty-three, whereas the specimen from the ( Knight Errant ' 

 has forty-five. The bristles of the two series agree in structure, though it must be stated 

 that the long example from the ' Knight Errant ' has dorsal and ventral bristles of a 

 more slender character than the northern, and they are paler. The papillae in the 

 example from the ' Knight Errant ' are longer and more slender, both dorsally and 

 ventrally. The shorter variety, with about twenty-two bristled segments, would appear 

 to correspond with Rathke's Siphonostomum villosum. 



Parasites.— Projecting from the anterior opening of the example from the 'Knight 

 Errant ' are a series of minute whitish bodies, which appeared to be Infusorial parasites 

 attached to a branched axis like Garchesium, 



Genus XOIII. — Flabelligera, Bars, 1829. 



Siphonostoma, Otto 2 ; Syphostoma, Cuvier ; Ghlorhsema, Dujardin; Lophiocephala, 

 Costa; Siphonostomum., Grube. 



1 ' Vidensk. Meddel. Foren. Kjobenh./ 1887, p. 23, figs, c to E. 



2 ' Animalium maritimorum nondum editorum genera dua De Sternaspido et Siphonostomida/ 

 Vratislavise, 1820. 



