THE BARNACLES IN THE U. S. NATIONAL MUSEUM. (U 



The rostral latus is quadrangular, al)out as high as wide. The basal 

 margin is much shorter than the scutal, the rostral and lateral margins 

 subequal and diverging upward. The scuto-lateral angle is truncated 

 and rests against the upper latus. 



The inframedian latus is extremely narrow, almost linear. The 

 upper end curves slight!}^ toward the scutum, and the base is a tritle 

 widened. The umbo is not distinct, but presumabl}^ apical. 



The carinal latus is shaped like the upper latera, nnicli higher than 

 wide. The carinal margin is double the length of the scutal and par- 

 allel to it. At its 'lower fourth the umbo projects slightly bej^ond 

 the carina. The })asal and upper margins are very oblique and straight. 



The peduncle is short, with about eight rows of six large, trans- 

 versely lengthened scales eaeh. 



Length of the capitulum 9.5, breadth 3.5 mm.; length of the 

 peduncle, 2.3 mm. Length of the carina 7.5, diameter at base 1 mm. 



This slender and graceful species resembles /S. 'planum Hoek, a 

 species without a rostral plate. It is also somewhat like S. l/retncari- 

 natuiih Hoek, but in that the carinal latera differ widely. A single 

 specimen was taken. (Fig. 23.) 



SCALPELLUM ANTILLARUM, new species. 



Ty/;^.— Cat. No. 9682 U.S.N.M. 



Type-locality. — Albatross Station 2384:, Gulf of Mexico, north lati- 

 tude 28° 45', west longitude 88° 15' 30", in 940 fathoms; bottom tem- 

 perature, 39.6° F. ■ 



The capitulum is long-oval, widest in the middle, tapering toward 

 both ends; composed of 13 or 14 wholly calcilied plates. The occlud- 

 ent and dorsal margins are about equally convex. The very thin 

 cuticle is somewhat hairy on the carina, sutures, and peduncle. The 

 plates are sculptured with widely spaced wrinkles in the direction of 

 growth-lines, and there are some extremely faint radial strife. 



The scutum is irregular in shape, the lower half wider than the 

 upper. Occludent margin convex; lateral margin weakly sigmoid. 

 The basal margin is straight, and the apex acuminate and a little 

 recurved, overl3dng the lower angle of the tergum. 



The tergum is triangular, a little longer than the scutum, with 

 nearly straight margins and an erect apex. 



The carina is long and evenly arcuate, with apical umbo. It extends 

 between the carinal latera to the peduncle. The roof is flat, bounded 

 by acute angles, which toward the upper part project a little, forming- 

 narrow marginal ribs. The sides are narroAv. 



The upper latus is ()bli(iuely spatulate. the scutal margin longest, 

 concave; tergal margin straight. Carinal margin shorter than that 

 against the carinal latus. The basal point is directly al)()\ e the infra- 



