i;i:i'oi;t on the cirripedia. 71 



The capitulwm is flat and elongate ; it is covered l>y a very thin chitinous membrane, 

 which is only slightly hairy. The number of the valves is thirteen ; on close examination, 

 however, a rudimentary rostrum, close to the lower extremity of the occludent margin of 

 the scutum, makes its appearance. 



Scutum elongate, twice and a half as long as broad. The occludent margin is dis- 

 tinctly arched, the basal margin almost straight ; the lateral margin describes an elegant 

 curve, being arched in the lower half and hollowed out in the upper half. The tergal 

 margin is also slightly hollowed out. The umbo of the valve is at the apex, which is 

 slightly recurved, and projects a little over the tergum. 



Tergwm triangular ; the calcified part consists of an occludent and of a carina] portion. 

 The scutal margin is distinctly hollowed out by a triangular chitinous portion. The sides 

 are nearly straight. 



Carina robust, simply bowed, with the umbo at the apex ; consisting of a flat roof 

 bordered on each side by a distinct ridge and well developed lateral parts. The latter 

 increase in width from the lower to the upper extremity. 



Upper lotus nearly triangular or trapeziform, owing to the presence of a very short 

 carina! margin. The umbo is at a short distance from the apex, hence the growth is 

 slightly upwards also. Basal margin slightly excavated about the middle. 



(Rostrum rudimentary, represented by an extremely small triangular portion.) 



Rostral latus convex, quadrangular-trapeziform, the seutal margin being a great deal 

 longer than the basal margin. 



Infra-median latus small, triangular. The umbo is seated at the apex. 



Carinal latus nearly quadrangular, with the lateral margin parallel to the carinal 

 margin ; the latter, however, is a great deal longer, and forms with the upper margin 

 a triangular portion penetrating between the carina and the upper latus. The umbo 

 of the valve is seated at or near the base, and is distinctly protuberant beyond the base 

 of the carina. The basal margin is nearly straight. 



Length of the capitulum of the largest specimen, 9 mm. 



The peduncle is short, measuring in the 9 mm. specimen not quite 2 mm. It is 

 covered by well-developed scales, eight of which are placed in a longitudinal row, seven 

 longitudinal rows composing the armature of the peduncle. 



During the cruise of the Challenger, this species was taken at Station 164a, 

 June 13, 1874; lat. 34° 13' S., long. 151° 38' E. ; depth, 410 fathoms; bottom 

 temperature, ?; bottom, grey ooze. One specimen. Station 169, July 10, 1874; 

 lat, 37° 34' S., long. 179° 22' E. ; depth, 700 fathoms; bottom temperature. 4°"2 C. ; 

 bottom, grey ooze. Two specimens. 



Observations. — On investigating the internal surface of the scuta of one of the speci- 

 mens, I found that both valves were furnished with a complemental male. Like the animal 

 within the capitulum, they were not well preserved, and therefore I will not enter into 



