THE BARXACLES IN THE U. S. NATIONAL MUSEUM. 109 



ward, while on the others they are straig-ht and wide. They are 

 prominent, ol)lique, and lamellar in the first articular farrow, less con- 

 spicuous in the others. The second and third articular ridges unite 

 near the apex, so that in a quite young stage there are but three artic- 

 ular ridges, of about equal width. 



The fixed scutum is divided into two nearW equal large areas, and 

 a third ver}^ narrow area next the tergum. The rostral area is regu- 

 larly sculptured with plain transverse riblets. The median area is tri- 

 angular, raised above the others, with the transverse sculpture irreg- 

 ular, rude, and interrupted by a number of irregular radial grooves 

 or indistinct sulci. Near the base it articulated with the rostrum bj^ 

 a single tooth. The tergal area is a ver}^ narrow obliquely costulate 

 segment not reaching to the base and separated from the median area 

 by a deep furrow. 



The fixed tergum stands erect, surrounding two sides of the mov- 

 able tergum, as viewed from above, hence its scutal and carinal walls 

 stand at right angles. Its surface is divided into three areas. The 

 scutal and carinal areas are triangular, reaching only about half waj^ 

 to the base, and are regularly sculptured with obliquely transverse 

 riblets. The median area stands in high relief, extends to the base, 

 and has wide, rather rude, and fiat transverse sculpture, the grooves 

 being linear and shallow. There is a poorly developed articular ridge 

 along the carinal edge of the plate. 



The carina is bent so that its two faces stand at right angles. A 

 broad rostral triangle is occupied by five radial ridges forming as 

 many teeth articulating with the rostrum. These ridges are crossed 

 by the transverse sculpture. Three of them extend to the apex of 

 the plate, the others being shorter and peripheral, therefore wanting 

 in the young stage. There is also a prominent radial ridge and a furrow 

 along the other margin of the plate, articulating with the fixed tergum. 

 The intermediate area, comprising a moiety of the surface of the plate, 

 has a rude sculpture of wide, flat, transverse pleats parted by shallow 

 linear grooves. 



The rostrum is like the carina in general shape. On its carinal face 

 there are five radial ridges, of which two or three arise at the apex, 

 the second ridge being widest. The rest of the plate has rude, flat 

 sculpture like that of the carina. Near the fixed scutum there are 

 several radial grooves and furrows. The apex of the rostrum projects 

 more than that of the carina. 



Greatest carino-rostral length 11.2 mm.; greatest breadth (at right 

 angles to length) 9.4 mm.; height from base to apex of the fixed 

 tergum 7.8 mm. 



This fine species is related to V. radiata Gruvel,*^ described from 



" Expod. Sci. du Travailleur et du Talisman, Cirrhipedes, p. 94, pi. ii, figs. 

 xix, XX. 



