REPORT ON THE CIRRIPEDIA. 79 



This species was taken at Station 1 50, February 2, 1874 ; lat. 52" 4' S., long. 71° 22'E. ; 

 depth, 150 fathoms; bottom temperature, l° - 8 C. ; bottom, rocks. 



Scalprllnm compwssuni, n. sp. (IM. III. figs. 13, 14). 



Capitulum covered by a thick chitinous membrane, hence the limits of the valves can 

 be only with difficulty made out. Valves thirteen, rostrum wanting. Umbo of the carina 

 at a short distance from the apex, the valve therefore angularly bent. Sides of the carina 

 extremely broad. Upper latus pentagonal. 



This true deep-sea species is represented by a single specimen only. It is a highly 

 characteristic form, constituting almost a distinct division of the genus by itself. 



The capitulum is extremely flat, compressed, and consists of thirteen valves. An 

 extremely small rostrum became visible as the thick chitinous membrane at the foot of 

 the occludent margin of the scutum was taken away. I think it hardly advisable to 

 consider it as a fourteenth valve. As the species is represented by a single specimen 

 only, and as I was not permitted to sacrifice it, I have not isolated the different valves, 

 which would have been the only way to ascertain their form. It was especially diflicull 

 to make out the valves of the lower whorl. 



The scutum is not very large ; its occludent margin is in length nearly twice the 

 breadth of the valve; the lateral margin is about equal to the breadth of the valve. The 

 scutum is divided into two triangular parts by a very prominent ridge. The umbo is at 

 the apex, which is slightly recurved. 



The tcrgum is triangular, with the occludent margin almost straight, and the carina! 

 margin arched. The scutal margin is straight. The valve is divided into two pails by a 

 very prominent i^idge, which is itself flat and arched, the hollow side being turned towards 

 the carina. 



The carina has a narrow roof and broad sides. Near its base the roof is deeply 

 furrowed, but this furrow disappears towards the upper extremity, where the roof is quite 

 flat. That part of the carina which is situated above and in front of the umbo describes 

 an obtuse angle with the roof, and runs almost imperceptibly into the margin of the tergum. 

 The chitinous membrane which covers the carina is longitudinally striped. 



The upper latus is pentagonal ; the umbo is at some distance from the apex. 



The rostral latus in quadrangular, the scuta! margin hollowed out, the basal margin 

 short, the rostral margin slightly arched. 



The infra-median hit us is narrow, its umbo at a short distance from the base. Beneath 

 it there is a small triangular part, above it an elongated part. Perhaps the infra-median 

 latus is much broader, especially towards the carina! latus. 



The carina/ latus is quadrangular, the carinal margin hollowed out. The umbo is 

 seated near the base, and does not extend beyond the carina. 



