REPORT ON THE CIRRIPEDIA. , 3 



projects freely for some distance. The sides of the carina arc distinctly developed in the 

 superior part, tapering towards the inferior extremity. 



The rostrum is short, triangular, with the apex recurved towards the opening -lit 

 between the two scuta. 



The upper lotus is triangular, and situated almost between the rostral and carina] 

 latera. Of these valves, and also of the rostrum and the sub-carina, the umbonal parts only 

 can be clearly distinguished, the basal parts being totally embedded in the membrane. 



The carina! lotus is a little smaller than the upper hit us ; the rostral lulus is a little 

 smaller than the carina! latus. 



Finally, the sub-carina almost equals in area the rostrum. Its apex, however, is no1 

 so distinctly recurved as is the case in the rostrum. 



Length of the capitulum 13 mm., breadth in the middle 8 mm. 



The peduncle is very robust, its width almost equalling that of the capitulum. It 

 has a length of 6 mm. and is cylindrical, being only slightly compressed laterally. Its 

 extremely small scales are totally covered by membrane, so that not even their summits 

 are visible. The hairs clothing the membrane are very short, and can only be dis- 

 tinguished by means of a magnifying lens. 



This interesting species was taken at Station 201, October 26, 1874 ; lat. 7° 3' N., 

 long. 121° 48' E. ; depth, 82 and 102 fathoms; bottom, stones and gravel. 



Observations. — Station 201 is situated in the Philippine Archipelago, and probably 

 Scalpelluin villosum, Leach, sp., with which this species is nearly related, is also an 

 inhabitant of the Malay Archipelago. Both species come very near to Pollicipes. The 

 small number of the valves and the presence of complemental males made Darwin place 

 Scalpellum villosum by the side of the other species of Scalpellum. Whereas in the 

 first mentioned point Scalpellum trispinosum even surpasses Scalpellum villosivm (a sub- 

 rostrum which is present in Scalpellum villosum is wanting in Scalpellum trispinosum), 

 I was unable to ascertain the presence of a complemental male. 



B. Species with the carina angularly bent. 

 Scalpellum stroemii, Sars (PI. III. fig. 6 ; PI. VII. figs. 12-14 ; PI. Mil. figs. 1-5). 



Scalpellum siroemii, Sars, Forhandl. Vidensk. Selsk. Christiania (1858), 1859, p. 158. 



„ „ Sars, Vervill, Amer. Journ. Sci. and Arts, ser. 3, vol. vii., 1S74, pi. viii. fig. 7. 



Valves fourteen, not covered by membrane. Carina distinctly bent, with the umbo 

 at a small distance from the apex; upper latus pentagonal; valves of the lower whorl 

 much developed. Infra-median latus oblong-quadrangular. 



In the collections made during the cruise of the Challenger this species is 

 represented by nineteen specimens. Moreover, Mr. Murray sent me two specimens 

 dredged in the summer of 1882 by 1 1. M.S. "Triton." The description of this 3pecies given 



(ZOOL. CHALL. EXP. PART XXV. — 1883.) I Hi 10 



