THE BARNACLES IjST THE U. S. NATIONAL MUSEUM. 



39 



long" as the whole capitnhiin and extends ahnost to the apices of the 

 terg-a. 



The largest specimen of the type lot has a capituliini fully 11 nun. 

 long. 



Exan^ples from Station 2415 have a more hairy cuticle than the type 

 lot, largely concealing the plates. They are attached to a br'anching 

 OculinaAike coral. (Fig. 9.) 



SCALPELLUM SANCTIPETRENSE, new species. 



Type.—CdLt. No. 32898, U.S.N.M. 



Type-land Ity. —San Pedro, California, in 50 to 75 fathoms. Mrs. 

 Oldroyd. 



The capitulum is narrow and long, the length more than twice the 

 width; occludent margin nearly straight, the carinal regularly arched; 

 composed of l-t fully calcified 

 plates, covered with a thin, 

 very short hairy cuticle. The 

 plates are weakly marked with 

 growth lines, and some weak, 

 very faint, radial striie. 



The scutum is much more 

 than twice as long as wide, 

 with moderately convex oc- 

 cludent margin. The lateral 

 margin is straight, parallel to 

 the occludent. The umbo is at 

 the acute apex. 



The tergum i* larger than 

 the scutum, triangular, its oc- 

 cludent margin arched, scutal ^ 



. , J.1 • 1 ^'^^- 10- — SCALPELLUM SANCTIPETRENSE. «, LATERAL 



margin straight, tne carinal view x 5; 6, c, eostral views of two cotypes. 



margin nearly straight, being 



veiy weakl}' concave above and convex below. The plate projects 



above the summit of the carina only about one-tifth of its carinal 



length. 



The carina is ver}^ long, weakl}", evenly arched, with apical umbo. 

 The roof is deeply channeled between strong, rounded bordering ribs. 

 The sides are rather wide throughout. There is a small arcuate riblet 

 dividing off a small intraparietal area near the beak. The base of the 

 carina projects triangularly between the carinal latera. 



The upper latus is long, witii five unequal sides. The scutal margin 

 is longest, and slightly concave. The straight tegal and carinal 

 margins are al)out equal. The basal margin against the carinal latus 

 is straight, shorter, but about twice the length of the margin against 

 the inf ramedian latus. The umbo is subterminal. 



