REPORT ON THE CTRRIPEDIA. 1 I'll 



Scalpettum balanoides, n. sp. (PL V. fig. 15; PL X. fig. II ; PL XI. figs. 1-3). 



VaJves thirteen, covered by thin membrane. Carina extremely short, simply, in lint 

 hardly at all, bowed, without a distinct roof. Umbo of the carina a1 the apex. Uppei 

 latus triangular. Valves of the lower whorl extremely Jarge. Carina! latus almosl as 



high as the carina, with the umbo at the apex. 



This interesting little Scalpcllum is very remarkable by the size of the valves of tin- 

 lower whorl, and has a curious shape in consequence of the great dimensions of its carina! 



latus. 



The capitulum is fiat, consists of thirteen valves, and is covered by a very thin mem- 

 brane. The capitulum is narrow at the base, having there the same breadth as tie- 

 peduncle ; it is almost twice as broad in the middle, where, the carina! latus being very 

 large, the base of the carina is to be sought for. From there it gradually slopes towards 

 the upper extremity. Lines of growth of the different valves not very distinct. 



The scutum is about twice as long as broad ; the occludent margin is almost straight, 

 and the umbo is at the apex of the rather sharp angle which is formed by the occludenl 

 and by the tergal margins. Tergal and lateral margins about of the same length, half as 

 long as the occludent margin. Basal margin about at a right anglewith theoccludent margin. 



The tergum is triangular, and nearly equals the scutum in size. Theoccludent margin 

 is short, the scutal margin is middle-sized, slightly convex ; the earinal margin is by fax 

 the longest and rather convex. 



The carina is very short, simply, hut not very strongly, bowed. The umbo is at the 

 apex. There is no very marked limit between the roof and the sides of this valve, a- is 

 the case in the greater part of the other species. 



The upper latus is triangular by the absence of a earinal margin. The area of tie 

 valve is not very considerable. The umbo is at the scuto-tergal angle. Scutal and 

 tergal margins have the same length, the basal margin is a little longer. 



The rostral latus is quadrangular. Umbo at the apex of the angle formed by the 

 rostral and scutal margins. The basal margin is shorter than the nearly equal rostral and 

 scutal margins. The lateral margin is a little longer than the rostral margin. A ridge 

 running from the apex to the angle formed by the basal and lateral margins divides the 

 valve into two triangular parts with different lines of growth. 



The infra-median latus is elongate, triangular; the umbo is at the apex. The 

 rostral margin is slightly concave, the earinal margin distinctly convex. 



The earinal latus is very large. Umbo at the upper extremity of the earinal margin, 

 convex. The earinal marsrins of the two valves are very long, and meet one another 

 along nearly the whole length, beneath the base of the carina. The upper and lateral 

 margins are nearly equal in length, the basal margin is short. 



(zool. CHALI.. EXP. — part xxv. — 1883.) Bb 17 



