Barnacles of the Genus Scalpellum. 115 



'til appendages (fig. I. E) equal to or a little longer than 

 peduncle of sixth cirrus, of I or 5 segments. Penis absent. 



Measurements. — Length of capitulum 36 nun., breadth 

 22 iii.ii. ; length of peduncle 35 nun., diameter 13 mm. 



Remarks. — Regarding only the characters of the capitular 

 plates, the differences separating this species from S. regina 

 are so little marked as hardly to suffice for the discrimination 

 of i!: ~. The most important, perhaps, are the form 



of the upper latus, with its acute and curved apex, and the 

 projecting umbo of the carinal latus. The value of these 

 differences, however, is greatly enhanced by the very striking 

 differences shown by the appendages. The inaudible has a 

 relatively smaller interval between the distal teeth; the cirri 

 are shorter and the rami of the first cirrus have fewer 

 segments : the caudal appendages are xevy short and com- 

 posed of lew segments, and the penis is absent. In certain 

 characters, such as the form of the upper latus and the 

 number of segments in the cirri and caudal appendages, the 

 species approaches S. regium, but it differs -widely from it in 

 the form of the carinal latus, which in that species is much 

 higher and has an apical umbo. 



Scalpellum (Scalpellum) alcocklanum, Annandale. 



Scalpellui mum, Annandale, Ann. & Mag. Nat. Hist. (7) xvii. 



L906,p.392; id. Illustr. Zool. 'Investigator,' Crust. Entom. pi. i. 

 fig. 2, pi. ii. figs, 2 2 b (1907) ; id. Rec. Ind. Mus. ix. 1913, p. 229 ; 

 id. Mem. Ind. Mus. vi. 1916, p. li".», pi. vi. figs, o-o b. 



Locality.— Lat. 10° 45' S., long. 120°50 / E. (Java-Aus- 

 tralia), 700 i'ath. C./S. ' Patrol/ 1 g . 



Remarks. — The specimen, which has almost exactly the 

 dimensions recorded by Annandale except that the peduncle 

 is a little longer, agrees very well with a somewhat smaller 

 specimen received from the Indian Museum, and apparently 

 one of the syntypes. In both specimens the capitulum is 

 inflated in its upper part, less strongly in the syntype than 

 in the new specimen, where the main swelling seems to be 

 over the areas between thetergumand neighbouring valves; 

 the swelling is not due to a thickening of the wall, but to 

 an expansion of the mantle-cavity. 



In the present specimen the calcareous valves are rather 

 more widely separated than in the syntype, the occludent 

 margins of terga and scuta form an even curve rather than 

 a projecting angle, and the upper latus has its scutal margin 

 more concave. In both specimens the scutum is more than 



S* 



