293 BARNACLES FROM DEEP-SEA CABLES. 



armed with 8 valves. The number of valves is, however, probably 

 abnormal as it is brought about by the separation, quite asymme- 

 trically, of two small plates, one on either side of the carina a little 

 above its base. The normal number is, as in allied forms, probably 

 6. The capitulum is about as broad aJDove as it is high, it is much 

 broader than the peduncle and moderately compressed from side to 

 side. The orifice opens upwards and outwards. 



The six valves are stout and of comparatively large size. The 

 terga are much smaller than the others and have an almond-shaped 

 outline. Their main axis is vertical. The scuta are broadly 

 triangular and much wider than the other valves; their apices are 

 pointed and turned backwards slightly. The rostrum is large, re- 

 latively narrow, very prominent but somewhat retroverted at the 

 apex. The carina is narrow, curved, pointed above and subtrun- 

 cate at the base. The apices of this valve, of the terga and of the 

 scuta are almost on a level. The appendages are relatively shorter 

 than in the hermaphrodite but otherwise similar. They lack the 

 peculiar ornamentation characteristic of the larger sex but are 

 armed similarly. The mouth-parts are well developed and also 

 resemble those of the hermaphrodite, except that the labrum is 

 relatively smaller and the mandibles have fewer teeth. The anal 

 appendages are leaf-like and consist of a single segment: there is a 

 small bunch of long hairs at their free extremity. The penis is not 

 annulated. 



The younger males have a much narrower capitulum of oval 

 outline. The rostrum and carina are considerably smaller and not 

 at all prominent, while the other valves are less regular in shape. 

 The vesicula seminalis, a conspicuous feature of the large male, is 

 barely visible in the smaller individuals. 



Measurements. 



Hermaphrodite (type) Adult Male Young Male- 

 Height of capitulum 55 mm. 4-5 mm. 2*5 mm.. 

 Width of capitulum 40 „ 4-5 ., 2-0 „ 

 Thickness of capitulum 20 „ — — 

 Length of peduncle 56 „ 2*8 „ 1-5 „ 

 Diameters of peduncle 25 x 18 „ — — 



Type-specimen. Crustacea, 9319/10, Z. S. I. (Ind. Mus.). 



Locality. Lat. 10° 22' 30" (?S), long. 120° T 30" E. (130- 

 500 fathom), Java Sea. 



This species, taking both the hermaphrodite and the male into- 

 consideration, would find a place in the genus Calantica as re- 

 defined by Pilsbry in 1908, but is not at all allied to S. villosum 

 (Leach), the type of that genus. Xor is it related to the Xortb 

 Atlantic forms assigned by Pilsbrv to the group Scillaelepas. In 

 spite of the absence of an upper latus in the hermaphrodite it seems 

 to me to be probably related to such forms as Scalpellum stratum. 



Jour. Straits Brancfc= 



