108 Dr. W. T. Caiman on 



not greatly expanded. Sixth cirrus with rami of about 22 

 segments, middle segments bearing four pairs of spines 

 anteriorly and a group of long distal setse posteriorly ; no 

 conspicuous spines or setae on inner face of endopod seg- 

 ments. Caudal appendages absent. Penis absent. No 

 males were found. 



Measurements. Length of capitnlum 13'0 mm., breadth 

 7*0 mm. ; length of peduncle 10 mm., diameter 4'5 mm. 



Remarks. In Hoek's classification of the genus this species 

 would find a place in the section (or subgenus) Arcoscal- 

 pellum and in " Group c," of which S. hamatum is the type. 

 From most of the species forming this group it is dis- 

 tinguished by the strongly ribbed valves, resembling in this 

 respect some speciesof Hoek's ""Group d" {S. form osnm, &c); 

 but it appears to be separated from all the members of both 

 groups by the very low rostro-lateral plates. The structure 

 of the appendages dues not appear to have been described 

 in any closely related species, but the complete absence of 

 caudal appendages is, at all events, very unusual in the 

 genus. Gravel mentions, as the only example of this defi- 

 ciency, the widely different S. villosum, and to this, as 

 mentioned above, the hardly less different S. acutum must 

 now be added. 



Scalpellum (Scalpellum) velutinum, Hoek. 



Scalpellum vein t iiium, Iloek, Rep. 'Challenger' Cirripedia, 1883, p. 96, 

 pi. iv. tigs. 10, 11, pi. ix. figs. 7-9; Gravel, Exp. ' Travailleur ' et 

 ' Talisman,' Cirrhipedes, 1902, pp. 56, 130, pi. ii. figs. 3 c, 14, pi. iii. 

 figs. 1, 27-31. pi. iv. tigs. 6, 1 1-22 ; Pilsbry, Bull. U.S. Nat. Mus. 

 Ix. 1907, p. 26, pi. iii. figs. 2, 3 ; Annandale, Illustr. Zool. ' Investi- 

 gator,' Crust. Entom. pi. iv. fig. 7 (1908) ; id. Rec. Indian Mus. ix. 

 1913, p. 229. 



S. eximiiim, Iloek, Rep. • Challenger ' Cirripedia, 1883, p. 100, pi. iv. 

 tigs. 6, 7, pi. ix. figs. 10, 10*. 



& sordidum, Aurivillius, Bull. Soc. Zool. France, xxiii. 1898, p. 190. 



S. (datum, Gravel, Bull. Mus. Paris, vi. 1900, p. 192. 



Localities. Lat. 8° 46' S., long. 114° 44' E. (Java- 

 Australia), 400 fath. C./S. 'Recorder/ 1 ? . 



Lat. 10° 45' S., long. 120° 50' E. (Java-Australia), 

 700 fath. C./S. ' Patrol/ 1 ? . 



Lat. 11° 0' S., long. 121° 30' E. (Java-Australia), 

 500 fath. C./S. ' Patrol/ 3 ? . 



Lat. 11° ()' S., long. 122° 0' E. (Java-Australia), 

 GOO fath. C./S. ' Patrol/ 3 ? . 



Aden-Zanzibar cable, about 600 fath. C. S. 'Colonia/ 

 1 ?• 



