THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 33 



giganteuiii. These differences do not seem sufficient to call for 

 specific separation. 



The rostrum, wheti very small and covered by the cuticle, is subject 

 to considerable variation, as I have found in numerous species. 



The roof of the carina is rounded, in section like the letter U. This 

 differentiates the species from other large Atlantic forms. The wide 

 chitinous spaces between the calcified portions of the valves is a 

 further distinguishing feature. 



The single young specimen from Station 2554 extends the range 

 of this fine species far to the north, and one very large individual. 

 No. 32011, U.S.N.M., taken by a Gloucester fisherman, with no 

 more precise locality than "fishing banks," indicates that S. gigan- 

 tenm may range as far north as S. velutinum. This individual 

 (Plate III, fig. 1), measures: Length of capitulum 47, breadth 35, 

 diameter 20 mm., length of peduncle about 37 mm. The uncalcified 

 boundaries of the plates are indicated by whitish lines in the chitinous 

 spaces. 



(JROUP OF SCALPELLUM GORGONIOPHILUM. 

 SCALPELLUM GORGONIOPHILUM, new species. 



Type.— Cd.i. No. 9883 U.S.N.M. 



Type-locality. — Albatross Station No. 2338, off' Habana, Cuba, north 

 latitude 23° 10' 40", west longitude 82° 20' 15", in 189 fathoms, coral 

 bottom, on a gorgouian. 



The capitulum is rather wide at the base, the carinal and occludent 

 margins subparallel in the lower two-thirds; cream-white, the plates 

 of the upper whorl crimson-violet tinted toward their umbones; not 

 hairy, and with no noticeable cuticle; sculptured with rather rude 

 growth lines and fine, indistinct radial strite, with a stronger diagonal 

 rib on the scutum and on the upper latus. 



The scutum is long and rather narrow, with slightl}'' arched occludent 

 margin; lateral margin straight, subparallel to the occludent; basal 

 margin straight, at a right angle to the occludent. It is acuminate 

 toward the acute apex. Umbo apical. 



The tergum is very long and narrow, with erect apex. The lower 

 margin is slightly convex. 



The carina is very short, its curvature chiefly near the apex.^ The 

 roof is convex and radially striate, with narrow ribs separating it 

 from the sides. The sides are wide, separated from the intraparietes 

 b}^ a sharply elevated arcuate rib. The umbo is apical and situated 

 at the middle of the carinal margins of the scuta. 



The upper latus has a long, straight, scutal margin; tergal and 

 carinal margins nearly equal; basal margin quite short and oblique, 

 formed by contact with the carinal latus. The umbo is apical. 

 4715— Bull. 60—07 3 



