198 BULLETIN OF THE BUREAU OF FISHERIES. 



Tergum triangular, the occludent margin convex, apex recurved, scutal margin straight, carinal 

 margin Btraight, except near the apex, where it is concave. Tin- carina is evenly arched with apical 

 umbo, the roof flat, bounded by a strong rounded ridge along each side, the sides at a little more than 90 

 degrei 8 with the roof, widest above. It extends beyond the middle of the tergum. The upper lateral 

 plate is quadrangular, the sides straight, scutal margin much the longest, fully twice as long as the cari- 

 nal margin; umbo apical. 



There is no rostrum. The rostral lateral plate is quadrangular, a little narrower in front, being thus 

 somewhat wedge-shaped. It is much shorter than wide. At the occludent margin the umbones are 

 contiguous and project a little. The inframedian lateral plate is very small and narrow, wedge-shaped, 

 with apical umbo. The carinal lateral plate is very irregular in shape, much higher than wide, the 

 umbones projecting and recurved beyond the base of the carina. The carinal margin is equal in length 

 to the scutal margin of the upper lateral plate. 



Thi' peduncle is about half as long as the capitulum, pretty closely covered with wide, short scales, 

 and sparsely hairy. 



Length of capitulum 17 mm., breadth 9 mm., diameter 3 mm. Length of carina 13 mm. Length 

 of peduncle 9 mm., diameter 3 mm. 



Type, no. 82414 IT. S. National Museum, from station 4418, Southwest Rock, Santa Barbara Island. 

 238 fathoms, on an annelid tube, gray sand bottom. The half dozen specimens of the type lot show no 

 mentionable variation. Only two reached the dimensions given above, the others being two-thirds to 

 three-fourths that size. 



Scalpellwm tritonis Hoek and S. luteum Gruvel, both Atlantic species, rather closely resemble this 

 form in lateral aspect. 5. tritonis has a flat-roofed carina. In S. luteum the carina is bicostate, but the 

 inframedian lateral plate is wider at the base, triangular, the shape of the carinal lateral plates below the 

 carina is different, etc. It is from near the Azores, and seems, in the ensemble of its characters, to be 

 more nearly related to .5. griirclianiint than any other species now known. S. planum Hoek has a carina 

 with similar raised angles, but the other plates differ widely. By the keys of Hoek and Gruvel, S. 

 gruvelianum comes out to S. planum, but a place can easily be made for it by attention to the shape 

 >f scutum and the lateral plates. 



This species is respectfully dedicated to M. A. Gruvel, author of various valuable works on cirri- 

 pedes, including a useful monograph. 



Scalpellum gruvelianum secundum, n. subsp. 



[PI. vii, rig. 4.] 



Similar to <S. gruvelianum in general characters, but the carina extends somewhat higher on the 

 tergum. tin- sutures are wider, the plates being more separated by chitinous interspaces, and the infralat- 

 eral plate differs in shape, being somewhat wider above than below, with subcentral umbo, the lower 

 half of the plate being raised in a short thick ridge. Length of capitulum 9 mm., of peduncle 4 mm. 



Type, no. 32415 U. S. National Museum, from Albatross station 4429, Gull Inlet, south coast of Santa 

 Cruz Island, in 506 fathoms, gray mud. 



Represented by a single specimen, which while obviously related to >S. gruvelianum, yet presents a 

 number of differences which seem to indicate another variety or species. The apices of the terga seem 

 lo have been broken or worn off. 



Scalpellum perlongum, n. sp. 



[PI. vi, iig. 12. 1 



The long and narrow capitulum is composed of 13 white valves, is nearly nude and nowhere hairy. 

 There is no rostrum; the umbo of the carina is apical; the valves are wholly calcified, and marked with 

 growth lines. 



The scutum is quadrangular, convex, with the occludent margin convex above, straight below.. 

 The umbo slightly overlaps the tergum, tergal margin oblique, basal margin slightly convex. The 

 lower anterior part of the valve is sculptured with weak radial stria?. 



The tergum is longer than the scutum, triangular, the occludent margin convex, basal margin 

 Btraight, carinal margin sinuous. 



