1*)S HITLLKTIN OF THK BUREAU OF FISHERIES. 



Tirtjuin tiiangulai'. tin- ciccludent margin convex, apex recurved, scutal margin straiglit. carinal 

 riiaru'in .-:liaii;lit. except near tlie apex, where it is concave. The carina is evenly arched with apical 

 iiiiil>n, thi' roof Hal . Ixiunded by a .strong rounded ridge along each side; the sides at a little more than 90 

 ilci,'rc( s with the ronf. widest above. It extends lieyond the middle of the tergum. The upper lateral 

 plate i.s 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. Vicing thus 

 ■somewhat wedge-shaped. It is much shorter than wi<h'. At the occludent margin the umboncs are 

 coiuiguous and project a little. The inframedian lateral plate is very small and narrow. W(>dge-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 tlie upper lateral plate. 



The pediuicle is abotit half as long as the capitulum, jiretty closely covered witli wide, short scales, 

 and sparsely hairy. 



Length of capitulum 17 mm., breadth li mm., iliamcier :'■ mm. Length of carina 13 nun. Length 

 of jieduncle 9 mm., diameter 3 mm. 



Type, no. 152414 U. S. National Museum, from slalion 4418. Southwest Rock, Santa Barbara Lsland. 

 2;iS 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. 



Scali>t'Hiim Irilonis Hoek and .?. liitcnm (iruvel. liolh .\tlantic species, rather closely resemble this 

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

 inframedian lateral plate is wider at the base, triangidar, 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 S. grui'dianum 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, .?. 

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

 of scutum and the lateral plates. 



This species is respectfully dedicated to M. A. (Jruvel, author (jf various valuable works on cirri- 

 pedes, including a useful monograph. 



Scalpellum gruvelianurn secundum, n. sulisp. 



[PL VII. tig. 4.] 



.Similar to .S'.' (/rinr/ianjMM in general characters, but the carina extends somewhat higher on the 

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

 eral jilate differs in sliajie. lieing 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 Alhatrox.t station 4429, fitill Inlet, south coast of Santa 

 t'ruz Island, in 500 fathoms, gray mud. 



Represented liy a single specimen, which while oliviously related to <S. yruKliunimi. yet presents a 

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

 to have been broken or worn off. 



Scalpellum perlongum, n. sp. 



[PL VI. fig. 12,] 



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

 There is no rostrum: the umbo of the carina is apical: the valves are wholly calcified, and marki'd with 

 growtli lines. 



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

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

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



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

 straight, carinal margin sinuous. 



