Barnacles of the Genus Scalpellum. 113 



The carina of one specimen shows faint traces of marginal 

 ridges to the roof. The rostral latus, and especially the 

 inframedian latus, are wider than the figure, the latter valve 

 being about twice as wide as high. 



Pilsbry does not describe any of the appendages. The 

 mandible has four teeth, the interval between the two distal 

 less than twice that between second and third. The cirri 

 are pale. The first cirrus has rami not very unequal, with 

 18 and 20 segments, and the exopod is slender in its distal 

 third. The sixth cirrus has 36 segments in the exopod, 

 with five pairs of spines on the middle segments. The caudal 

 appendages are about half as long as the sixth cirrus, with 

 26-30 segments. The penis is slightly longer than the 

 caudal appendages, slender, tapering, with a few scattered 

 setse on its distal part. 



Scalpellum (Scalpellum) regulus, sp. n. (Text-fig. 4.) 



Locality.— hat. 9° 15' S., long. 115° 10' E. (Java-Aus- 

 tralia), 800-1500 fath. C./S. ' Patrol.' 2 ? . 



Description. — Resembling S. regina, Pilsbry. Valves 

 covered with opaque velvety cuticle with only the umboues 

 exposed; separated from each other by rather wide chitinous 

 interspaces ; with well-marked but not prominent and 

 rather widely-spaced lines of growth. Tergum nearly twice 

 as long as wide, occludrnt margin straight, carinal margin 

 strongly and scutal margin slightly convex ; no distinct 

 apico-basal ridge. Scutum less than twice as long as wide, 

 occludent margin nearly straight, lateral margin convex, 

 passing without marked angle into the straight tergal 

 margin ; apex acuminate, slightly recurved. Carina arcuate 

 throughout its length, less than six times as long as wide 

 at base; umbo apical, entering between terga, roof slightly 

 convex, without marginal ridges, parietes very narrow, at 

 right angles to roof, base rounded or angled. Upper latus with 

 tergal margin convex and scutal margin concave, so that the 

 acute apex is turned forwards ; carino-basal margin convex, 

 forming an almost even curve. Rostrum very small, trian- 

 gular, separating the rostral latera. Rostral latus low, with 

 an oblique ridge from the umbo. Inframedian latus trian- 

 gular, nearly equilateral. Carinal latus shaped much as in 

 S. regina, but with umbo closely appressed to, and not pro- 

 jecting behind, the carina (tig. 4, B). 



Peduncle about as long as capitulum, with large over- 

 lapping scales arranged in 10-12 rows of 11-13 scales each. 



Ann. & Mag. N. Hist. Ser. 9. Vol. i. 8 



