IQIS-] N. Annandale : Indian Barnacles. 229 



2. Inframedian latus truncated above, not monili- 



form . . . . . . . S. albatrosstanum, p. 232. 



B. Valves delicate, almost smooth, often incomplete. 



1. Umbo of carina widely separated from apex of 



valve. 



a. Carina! latera projecting far beyond dorsum of 



carina . . . . . . S. gruvelii, p. 232. 



b. Carinal latera barely projecting beyond dor- 



sum of carina .. .. .. S. curiosum, -p. >23- 



2. Umbo of carina subapical. 



rt. Occludent latus much wider than high at its 



inner end .. .. .. S. laccadivicum, p. 23s- 



b. Occludent latus as high as wide in lateral 

 view. 

 a. Posterior basal part of carinal latera smooth, 



meeting over base of carina . . S. lambda, p. 234. 



0. Posterior basal part of carinal latera irregu- 

 larly corrugated, meeting below base of 

 carina . . , . . . S. longms, p. 234. 



I. Scalpellum alcockianum, Annandale. 



Ann. Mag. Nat. Hist. (7) XVII, p. 392 (1906); ///. Zool. 'In- 

 vestigator', Crust. Ent., pi. I, fig. 2; pi. II, figs. 2, 2a, 2b 

 (1907). 



In my original description of this species I failed to notice 

 the rostrum, which is concealed by the membrane and by the 

 band-like rostral latera. It is a small transverse hexagonal plate 

 pointed at either end and with the upper and lower margins 

 elongate and parallel. The labrum is prominent and bullate. 



The types are from 'Investigator' station 277 to the S. of 

 Ceylon: 5°48'i5" N., 80^56' E.; 859 to 880 fathoms. 



S. alcockianum is related to the N. Atlantic S. giganteum, 

 Gruvel, several of the peculiar features of which it possesses in an 

 exaggerated degree. Varieties may be expected to occur in which 

 the valves occupy a much greater part of the capitular area than 

 in the typical form, if we may judge from the analogy of S. stearnsi 

 Pilsbry, a somewhat similar Malaysian species. The great length 

 of the anal appendages is a noteworthy character, but the exact 

 length and the number of segments of these structures is variable 

 within wide limits. 



Type No. 'U^ Crust. Ind. Mus. 



2. Scalpellum velutinum, Hoek. 



Scalpellum velutinum , Hoek. ' Challenger' Zool. Rep. VIII (Cirri- 

 pedia), p. 96, pis. IV, figs. 10, ir, and IX, figs. 7, 8, 9 

 (r88i); Pilsbry, U. S. Nat. Mus. Bull. 60, p. 26, pi. Ill, 

 figs. 2, 3 (1907); Annandale, ///. Zool. 'Investigator,' 

 Crust. Ent., pi. IV, fig. 7 (1908) ; Ann. Mag. Nat. Hist. (8) 

 VII, p. 588 (1911). 



Scalpellum eximium, Hoek, op. cit., p. 100, pis. IV, figs. 6, 7, 

 and IX, figs. 10, 10* {1883). 



Scalpellum sordidum ^ Aurivillius, Bull. Soc. Zool. France XXIII, 

 p. 190 (1S98). 



