CIREIPEDIA FROM THE PACIFIC COAST OF NORTH AMERICA. 197 



Scalpellum proxiinuni, ii. sp. 



[PI. VI, lisr. C)_ll.] 



Capitulum ovate, compressed, composed of 13 well-calcitied valves. There is a well-marked band of 

 integument between the carina and the other valves. It is covered with a thin membrane which is 

 rather closely, shortly pilose. The plates have a sculpture of wide-spaced low ridges jiarallel to sn-owth 

 lines. The oceludent margin forms an even curve nearly as arcuate as the carina. 



The scutum is irregularly quadrangular, with convex oceludent margin, slightly recurved and very 

 acute umbo, whic'h projects slightly over the tergum: basal margin convex, upper margin concave, and 

 lateral margin sigmoid. The upper latero-tergal angle projects in a point between the apex of the upper 

 latus and the tergum. 



The tergum is triangular with recurved apex; oceludent margin convex, l)asal margin straight and 

 oblique, the carinal margin undulating. The carina is very long, regularly arched, with slightly con- 

 vex, nearly flat roof, bounded l)y low, rounded lateral ribs. The sides are narrow below, widening 

 above, and at an angle greater than 90° willi tlic niof. It extends upward fully three-fourths the length 

 of the tergum, nearly to its apex. 



The upper lateral plate is irregularly ])entagonal. the tergal and scutal margins longest, concave, the 

 apex obtuse, being a little built out on the tergal side of the umbo, which is suliterminal. The carinal 

 margin is quite short: the ba^al. which abuts a.gainst the inframedian latus, still shorter. There is no 

 rostrum. 



The rostral lateral plate is small, ipiadrangular, nearly as high as wide, with the umbo at the upper 

 angle of its oceludent margin. The inframedian lateral plate is narrow, hourglass-shaped, with the umbo 

 at the lower fifth, where the plate is narrowest. Below this is a small triangle and above is a larger one, 

 the upper margin abutting in part on the upper lateral plate, in part on the scutum, with an angle at the 

 suture between these plates. The carinal lateral plate is quadrangular, very much higher than wide, 

 the umbo slightly recurved and projecting below the carina. Its carinal margin is longer than the upper 

 lateral plate, ab(5ut parallel with its lateral margin: basal margin horizontal, upper margin very oblique. 



The peduncle is hardly half as long as the <apitulum. covered with wide short scales, of which there 

 are about 9 in any longitudinal row, and about 8 rows. 



Length of capitulum 15 mm., breadth 8 mm., diameter 3.4 mm. Length of carina. 13 mm. Length 

 of peduncle 6.5 mm., diameter 3 mm. 



Type, no. 32422 U. S. National Museum, from station 4387, 32° 29' 30" X.. 1 18° 05' 00" W., vicinity 

 of San Diego, Cal., 1,000 fathoms, on an annelid tube. 



Somewhat related to S. grvrdianum. but quite distinct by the long carina with less strong ribs at its 

 angles, the different shape of the scutum, and of all the lower whorl of plates. It stands verv near S. 

 novsezelandise Hoek, which has a capitulum of the same general shape, the valves similarly separated by 

 narrow chitinous interspaces. In S.pronmum the oceludent margin is more convex; the roof of the 

 carina is apparently greater in width below: the upper lateral plate is obtuse at the apex, not acute as in 

 Hoek's species: the inframedian latn-al plate differs in shape; and finally the portions of the carinal 

 lateral projecting below the carina ar(» shorter. S. flarum, Hoek is also N-ory closelv related, liut 

 differs l:iy the shape of the inframedian and carinal lateral plates. 



S. jiroximum belongs to a very widely distributed type of the genus, ranging probably through all seas. 

 Gruvel has identified S. novxzelandia; from the north Atlantic, taken by the Travailleur in 2,400 to 2,500 

 meters: and it may eventually be found expedient to subordinate a number of the allied forms to novse- 

 zelandise as subspecies. 



Scalpellum gruvelianum, n. sp. 

 [PI. VII, lig. 1-3.] 



Capitulum compressed, composed of 13 well-calcified valves, covered with a thin membrane which is 

 sparsely hirsute, especially on and near the carina. The plates have no sculpture other than low, wide- 

 spaced growth wrinkles. 



Scutum quadrangular, with convex oceludent margin, concave tergal, straight lateral and basal mar- 

 gins; the umbo is noticeably recurved and projects slightly over the tergum. 



