270 Records of the Indian Museum. fVoi,. Ill, 1909.] 



Habitat. — A single specimen from Lat. 0° 14' N,, Long. 104° 

 42' E. ; between 13 and 16 fathoms. I am indebted for this speci- 

 men, which is attached to the spine of a sea-urchin, to Dr. P. van 

 Kampen. It is numbered -H'^ in the Indian Museum register of 

 Crustacea. 



Scalpellum kampeni is a primitive form which would come in 

 Hoek's division Protoscalpellum (Hoek, Sib. Exp., Mono, xxxia, 

 p. 58), and would by Pilsbry be placed in the genus Smilium {Proc. 

 Acad. Nat. Set. Philadelphia , Ix, p. 107, 1908). 



I take this opportunity to state, as has already been inferred 

 in the explanation to plate iii, Crust. Ent., of the Illustrations of 

 the "Investigator," that Scalpellum pcllicatiim, Hoek {op. cif., 

 p. 91), is in my opinion a variety of the species previously described 

 by me as 5. sociabile. The anatomical differences noted by Hoek are 

 variable characters, and the mouth parts of the specimen I figured 

 and described were abnormal (see Mem. Ind. Mus., ii, p. 84, 1909). 

 The form of the anal appendages is very characteristic. 



The same author's S. stearnsi var. gemina only differs very 

 slightly from the form I described as 5. inerme, which is undoubtedly 

 a variety of the species to which Hoek referred his specimens. 

 S. stearnsi is very closely related to 5. magnum ^ of the Coralline 

 Crag of Sudbourne, but may perhaps be distinguished by the fact 

 that the carinal latus is not turned upwards at the tip and does 

 not project in so marked a manner. This, however, seems to be a 

 somewhat doubtful character in the fossil form, and, indeed, a 

 variable one in the recent species. That 5. stearnsi is the direct 

 descendant of S. magnum there cannot, at any rate, be any doubt. 



1 Darwin, Mon. Fossil Lepadidis, p. 18, pi. i, fig. i (1851). 



