REPORT ON THE CI KRIPKDI A. 1 2."> 



placed a little beneath the middle, its rostral and earinal margins are slightly hollowed oul 

 about the height of the umbo. 



The carina/ latus is large, quadrangular. The umbo i.s situated near the base of the 

 carina! margin, which is only slightly excavated for the reception of the basal portion of 

 the carina. Its lateral margin is rather long, longer than that part of the carina] margin 

 which is situated beneath the umbo. 



Length of the capitulum, 7 mm. 



The peduncle is short (not quite 2 mm.), eylmdrical : the longest axis of the peduncle 

 is not a continuation of the longest axis of the capitulum, but the two form an angle 

 of about 135°. The surface of the peduncle shows rather prominent scales, which, 

 however, are covered by membrane. 



1 have not studied the structure of the animal within the capitulum, nor have I 

 observed the complemental male of this species. 



The species was collected at Station 169, July 10, 1874; kit, 37° 34' S., long. 17'.' 

 22' E. ; depth, 700 fathoms; bottom temperature, 4° - 2 C. ; bottom, grey ooze. 



Observations. — The differences between this species and Scalpellum flavurn will be 

 given under that species. 



Scalpellum dubium, n. sp. (PI. IV. figs. 14, 15). 



Surface of the valves covered by a very thin and hairy membrane. Valves thirteen, 

 closely locked together. Carina simply bowed, with the umbo at the apex, with the 

 roof not quite flat being slightly convex laterally, and not bordered by distinct ridges. 

 Upper latus trapeziform. Infra-median latus triangular. Carina! latus rhomboid, with 

 the umbo in the middle of the carina! margin. 



This species is represented by a single specimen. Its capitulum is rather stout and 

 flat; the earinal and rostral sides of the capitulum being nearly parallel, give it an almost 

 rectangular shape. 



Capitulum Hat, covered by a thin membrane, which is much covered with hairs ; the 

 strke on the valves, however, are not wanting, though more prominent on the valves <>t' 

 the lower whorl than on the others. 



Scutum not very convex, with the lateral and occludent margins almost parallel ; the 

 tergal margin is slightly hollowed out, the umbo is at the apex, which projects over the 

 tergum. The basal margin is straight, and forms an angle less than 90° with the 

 occludent margin. Scutum about twice as long as broad, divided into two triangular parts 

 by a ridge running from the apex to the basal-lateral angle. 



Tergum triangular, with the occludent margin slightly arched, the earinal margin 

 almost straight, and the scutal margin slightly and not very regularly undulating. The 

 area of the tergum nearly equals that of the scutum. 



