REPORT ON TIFF, CIIIRIPEDIA. 



63 



was only acquainted with one recent species of Scalpellv/m (Scalpellum rutilwm, Darwin). 

 with a simply bowed carina, the umbo of which was placed at the apex. The greater part 

 of his living species had the carina angularly bent. Of the fossil species, on the contrary. 

 he mentions only one {Scalpellv/m magnum (Wood), Darwin), with an angularly bent 

 carina; all the others have the valve simply bowed. Now, as a rule, the carina pf the 

 deep-sea species is simply bowed, as is the case with the fossil species. But it is not a 

 rule without an exception, as Scalpellum stroemii, Sars, ami Scalpellum carinatwn, n. sp., 

 have the carina rather more angularly bent. 



As one of the more interesting forms of Cirripedia dredged during the cruise of 

 the Challenger, I may mention here Scalpellum tn'spttiosum, n. sp., which is nearly related 

 to Scalpellum villosum, Leach, sp. Like the latter it is highly characteristic, being an 

 intermediate form between Scalpellum and Pollicipes. It was collected in the Malay 

 Archipelago, at a depth of about 100 fathoms. 



The stud} r of the complemental males of some of the species of Scalpellum lias given 

 very interesting results. Since a more detailed treatment of the organisation of these 

 little creatures will not be given in the present report a preliminary description is inserted 

 under the heading of the different species. 



The following table may be of use for the determination of the species :— 



Scalpellum. 



Valves imperfectly calcified. 



A. Valves of the lower whorl imperfectly calcified a.s well as the other valves, 

 1!. Valves of the lower whorl perfectly calcified. 



a. Calcified portion of the upper Iatua elongate. 



(a) Apex of the tergum curved towards the carina, 



(b) Apex of the tergum straight, 



b. Calcined portion of the upper latus not elongate. 



(a) Calcified portion distinctly V-shaped, 



(b) Calcified portion only slightly concave, 

 Y. lives perfectly calcified. 



A. Species with a carina a portion of which projects freely. 



a. With a sub-rostrum and sub-carina, .... 



n. With a sub-carina only, . 

 I!. Species with the carina angularly bent. 

 a. With a distinct rostrum. 

 (a) With a sub-carina. 



a. Three pairs of lower latera, 

 (3. Two pairs of lower latera, 

 (is) Without a sub-carina. 



a. Umbo of the carina at a considerable distance from the 

 apex. 



Scalpellum marginatum, n. sp. 



Scalpellum japonicum, n. sp. 



,Srn//i> Hum insigne, n. sp. 



Scalpellum ovatum, n. sp. 

 Scalpellum intermedium, n. sp. 



Scalpellum villosum, Leach, sp. 

 Scalpellum triepinosum, n. sp. 



Scalpellum rostratum, I larwin. 

 Scalpellum peronii, Gray, -p. 



