THE BARNACLES IN THE U. S. NATIONAL MUSEUM. 



77 



The larg-est example of the type lot has a capituliim 35 mm. long. 

 Those from other stations are smaller. In No. 9007, an individual 

 with the capitulum 20 mm. long, the carinal latera do not project 

 behind the carina. Otherwise the plates are like those of the larger 

 individuals. (Fig. 30.) 



SCALPELLUM SANCTiEBARBARiE, new species. 



Type.—Cixt. No. 32915, U.S.N.M. 



Type-locality. — AlhatroKS Station 2839, off the Santa Barbara Islands, 

 California, in 414 fathoms. 



Othe?' locality. — Alhat7'oss Station 2980, otf Southern California, G03 

 fathoms. 



The capitulum is irregularly ovate, composed of 13 imperfectl}' 

 calcified plates, covered with a very thin smooth cuticle. The ventral 

 margin is strongly curved or sub- 

 angular at the nmction of scuta 

 and terga. The summit is obtuse. 

 The dorsal outline is very con- 

 vex, subangularat its upper third. 

 The calcified portions of the plates 

 are nearly smooth. 



The scutum is triangular, with 

 a short narrow tergal branch at 

 the apex. The occludent seg- 

 ment is about 2i times as long as 

 wide, convex, with nearly straight 

 occludent and lateral margins, 

 and an oblique, straight basal 

 margin. 



The tergum is V-shaped, both branches curved, the carinal branch 

 somewhat the longer. The apex is very slightly recurved, a chitinous 

 lobe on the occludent border is wider above, projecting, rounded, and 

 obtuse above the calcified umbo of the plate. 



The carina is strongly arcuate, very obtusely subangular at the 

 umbo, which lies at the upper fourth of the plate, and projects but 

 little. The roof is broad and flat, with bordering angles, distinct 

 above, obtuse near the base. The sides are extremely narrow, widest 

 under the umbo. The upper end of the carina is rounded and 

 approaches close to the apices of the terga. The base is rounded. 



The upper latus is broadly spatulate, the long scutal and tergal 

 margins concave, basal and carinal margins equal and very short, with 

 a straight margin between them. The umbo is near the base of an 

 upper narrow tongue-shaped appendage of the plate. 



a 



Fig. 31.— SCALPELLUM SANCT^BARBARvE O, TYPE; 

 b, A YOUNG INDIVIDUAL X li. 



