REPORT ON THE CIRRIPEDIA. 99 



attached to the interior side of the scutum of a female specimen near the 

 occludent margin. 



c. Whereas in the shallow-water species (Scalpellum peronii, Gray, sp.) these 



Cypris-larvse develop into a small male animal, with a distinct eapitulum 

 and peduncle, in man}- deep-sea species they develop by retrogressive 

 metamorphosis into a male of a much more rudimentary condition. 



d. Neither in the first nor in the second case can it be said that unisexuality is 



observed in a stage which corresponds to the I *\ pris-stage of the ordinary 

 development (see p. 17). 



This species was taken at Station III. January 15, 1873; lat. 37° 2' N., long. 

 9° 14' W. ; depth, 900 fathoms; bottom, Globigerina ooze. Station 335, March 16, 

 1876; lat. 32° 24' S., long. 13° 5' W. ; depth, 1425 fathoms; bottom temperature, 

 2° "3 C. ; bottom, Globigerina ooze. 



Observations.— The two Stations from which this species was obtained are both in the 

 Atlantic; the one (near Cape St. Vincent) has about the same northern latitude as the 

 other (north of Tristan da Cunha) has southern latitude. 



Scalpellum pedunculatum, n. sp. (PI. VI. figs. 1, 2). 



Valves fourteen, covered by membrane, clothed with numerous spines. Carina simply 

 bowed, with the umbo at the apex and with the roof fiat. Upper latus quadrangular, 

 having the form of the sector of a circle. Carina! latus standing out very much beyond 

 the surface of the carina. 



This species is represented by a single specimen only ; it belongs to the same division 

 as, and is nearly related to, Scalpellum velutinum. 



Cap'rfulum triangular in outline, thick, especially near the peduncle. The valves 

 of the lower whorl are very small and short. All the valves are covered by chit- 

 inous membrane bearing slender spines all over its surface. The number of valves is 

 fourteen. 



Scutum quadrangular, little more than once and a half as long as broad ; apex slightly 

 produced, and projecting over the tergum. Occludent margin arched. 



Tergum triangular, occludent margin straight, carina! margin much arched, scuta] 

 margin slightly arched. In area the tergum slightly surpasses the scutum. 



Carina with a flat roof, not very much increasing in width from the upper to the 

 lower end, sides of the valve well developed, at angles greater than 90° with the roof of 

 the valve. The sides increase in width from the upper to the lower end. Carina simply 

 bowed, apex penetrating between the two terga, at a short distance from their 

 apex. 



