676 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



Gen. Conchoderma, Olfers. 



1814. Conchoderma, Olfers, Mag. Gesellsch. Nat. Freunde zu Berlin, Drittes Quartel. 



1851. Conchoderma, Darwin, Lepadidae, Ray Soc, p. 1.36. 



1883. Conchoderma, Hoek, Challenger Reports, vol. 8, Cirripedia, p. 53. 



The date and synonymy of this genus are discussed in Darwin's work. 



Conchoderma hunteri, Darwin. 



1851. Conchoderma Hunteri, Darwin, Lepadidae, Ray Soc, p. 153, pi. 3, fig. 3. 



The specimens in the present collection agree so fully vnth Darwin's description 

 and figure that it is unnecessary to do more than mention the salient features of the 

 species. All three lobes of the scuta are narrow. The carina in two of the specimens 

 runs up between the terga, which are abruptly bent at the top as in Darwin's figure, 

 rather than in his description, for the angle formed is much, instead of little, greater 

 than a right angle. 



Darwin gives length of the capitulum in his largest specimen as four-tenths of 

 an inch. The largest of Dr Willey's specimens is 21 mm. long, of which length 

 7'5 mm. belongs to the peduncle, the capitulum being rather over five-tenths of an 

 inch long. 



Habitat. Blanche Bay, New Britain. Attached to cables. The specimens described 

 by Darwin were attached to the skin of a snake, for which the specimens here 

 noticed perhaps regarded submarine cables as a satisfactory equivalent. They do not 

 seem to have suffered from settlement on a stationary host. 



Hoek says (loc. cit), " This may be a different species [from C. virgatum, Spengler] ; 

 but I think on account of its strong resemblance to the variety Conchoderma virgatum, 

 var. chelonophilus. Leach, and the complete conformity of all its interior characters to 

 those of Conchoderma virgatum, it would be a great deal more rational to regard it 

 also as a variety of Conchoderma virgatum." I have not materials for comparison, to 

 justify my offering an opinion on this poiat. 



Gen. Scalpellum, Leach. 



1817. Scalpellum, Leach, Jouru. de Physique, vol. 85, July, 1817. 



1851. Scalpellum, Darwin, Lepadidae, Ray Soc, p. 215. 



1883. Scalpellum, Hoek, Challenger Repoi'ts, vol. 8, Cin-ipedia, p. 59. 



Scalpellum sp. 



A single specimen agi-ees in general outline with Scalpellum ruhrum, Hoek, is 

 coloured red and white like that species, and has like it a capitulum 5 mm. long. 

 Also it occurs on a spine evidently of the same Echinoderm dredged in Blanche 

 Bay as that on the spines of which Megalasma striatum, Hoek, was found, and it 

 may be remarked that Hoek's two species were taken by the Challenger at one and 

 the same station, namely, near Luzon, in 100—115 fathoms. On the other hand the 

 Blanche Bay Scalpellum has a peduncle half, instead of ' about one-third,' as long as 



