32 BULLETIN 60, UNITED STATES NATIONAL MUSEUM. 



The umbo is elevated, acute, and curved toward the scutal margin. 

 A prominent ridge runs from the umbo to the scutal end of the plate 

 and two or three inconspicuous ridg-es to the basal margin. 



The peduncle is equal to or shorter than the capitulum, covered 

 with large scales and clothed with a velvety cuticle. There are 1(» 

 rows of about a dozen scales each in the figured t^^pe, but old indi- 

 viduals have more. 



Length of capitulum 43, breadth 30 mm. ; length of peduncle about 

 26 mm. Length of the carina 40, diameter at base mm. 



This line species stands between 8. regium and S. giganteu^n. It 

 differs from the former b}^ the wider chitinous spaces at the sutures, 

 the smaller inframedian and much lower carina! latera. It has not 

 such wide chitinous sutures as 8. giganteuin., which, moreover, has a 

 rounded carina, still lower carinal latera, and smaller scuta and terga. 



8. JiiichelotManuin Seguenza, of the Italian Pliocene, is a related 

 species. 



The 16 specimens show but little variation, except in the luimber of 

 scales on the peduncle, which increases with age, new longitudinal 

 rows being interposed. 



The two oldest individuals measure: Length of capitulum 46, breadth 



33 mm. Peduncle 45 mm. long, Avith 13 rows of about 16 scales each. 

 Length of capitulum 43, breadth 35 mm. Peduncle 40 mm. long, 

 with 13 rows of about IS scales each. 



SCALPELLUM GIGANTEUM GruveL 

 Plates II and III, figs. 1. 



1902. S. giganteum Gruvel, Trans. Linn. Soc. London, 2 ser., VIII, Zoology, p. 

 153, pi. XVII, figs. 1-8, 17; Monographie des Cirrhipedes, p. 78, fig. 88 (coast 

 of Cuba in 500 fathoms). 



Localities.— Cut. No. 11524, U.S.N.M., Allatross Station 2658, east 

 of Florida, north latitude 28° 21', west longitude 78° 37', in 514 

 fathoms. Also, Albatross Station 2554, north latitude 39° 48' 30", 

 west longitude 70° 41', in 455 fathoms, on 8. velutinum. 



Twelve individuals were taken, four of them young. One of the 

 largest has a capitulum 45 mm. long, the peduncle of about the .same 

 length. Usually onl}^ the apices of the valves are denuded of the thick, 

 dense, gray cuticle, which is very shortly and sparsely pilose, and 

 conceals the contours of the plates. It has been removed in the 

 example figured on Plate II, fig. 1, to show the shape of the calcified 

 portions of the plates. 



These specimens differ from Gruvel's tj'pes b}' the reduction of the 

 rostral plate, which is represented by a small granule only, or is com- 

 pletely absent. This plate is said to be small and oval in the original 

 description of giganteum. Moreover, the carina extends a little farther 

 down, and the rostral latera are better developed than in the types of 



