REPORT ON THE CIRREPEDIA. 77 



Scutum, tergum, and upper latus much resemble those of Scalpellum rutilv/m, Darwin. 

 Rostrum elongated and extremely narrow; quite enclosed between the two rostral 



sides of the rostral latera. 



Rostral latera convex, with the rostral margin shorter than the arched infra-median 

 margin, scutal margin slightly hollowed out, basal margin passing over with a rounded 

 angle into the infra-median margin. Along the scutal margin a distinct ridge is observed, 

 under which the valve is transversely hollowed out ; a second ridge runs from the apex 

 to the rounded infra-median margin. 



The infra-median latus has the form of a wine-glass with afoot. The umbo is seated 

 beneath the middle, hence the growth is for the greater part upwards ; the valve is added 

 to also round its rostral and carina] sides. 



The carin al latus has almost the same shape as in Scalpellum vulgare; it is large, 

 Hat; the carina! margin is hollowed out, the basal margin passes over indistinctly into 

 the lateral margin. The umbones of the two valves almost touch each other under the 

 middle of the carina,, and project over the base of the carina. 



Length of the capitulum about 16 mm. ; of the peduncle about G mm. 



The peduncle is nearly cylindrical, with not very numerous scales at the surfaci . 

 These are placed in about seven longitudinal rows, each row containing four to six scale.-. 

 The scales are distinctly calcareous, hence white, and separated from each other by rather 

 large intervals. 



This species was taken at Station 135, near the Island of Tristan da Cunha ; October 

 16-18, 1873; depth, 1000 fathoms; bottom, rock, shells. 



Observations. — No complemental male was present in the specimen I investigated in a 

 detailed manner. The relations of this species to the other species of the genus are rather 

 complex. The form of the carina much resembles that of Scalpellum ja/ponicum, bul ii 

 diners from this species by the valves being completely calcined. The roof of the carina 

 is flat as in the following section of the genus, but it has the umbo placed at a distance 

 from the upper extremity of the valve. 



Scalpellum rec tt ret rostrum, n. sp. (PI. III. figs. 11, 12; PI. VIII. figs. 9, 10). 



Capitulum covered by membrane. Valves fourteen, separated by broad membranous 

 interspaces. Umbo of the carina at a little distance from the apex, hence the valve is 

 slightly angularly bent. Upper latus trapeziform. [nfra-median latus triangular. 

 Peduncle cylindrical, with the calcareous scales scattered and at a considerable distance 

 from one another. 



Three larger and numerous very small and young specimens of this species were taken 

 between Kerguelen and Heard Islands. It is middle-sized, and belongs to the same 

 division of the genus as Scalpellum vulgare, Leach. 



