REPORT ON THE CIRRIPEDIA. 159 



Though also furnished with a deeplj toothed orifice, the shape of the shell in this 

 species is much more regularly tent-like than in the foregoing species. (1 is repre- 

 sented by two specimens only, one of which is attached to the spine of an Echinus; this 

 specimen is unsymmetrically flattened, and has an elongate bu1 very narrow base; its 

 orifice is large, which is caused by the perpendicular condition of the compartments; 

 the other specimen is attached laterally to the rostrum and the rostro-lateral compart- 

 ment of the first; this latter specimen Las a very regular shape and a broad circular 

 base, which is large in comparison with the orifice of the shell. 



Scutum (figs. 10 and 11) and tergum (figs. 9 and L2) resemble verj much the same 

 valves of Balanus corolliformis; the basal margin of the scutum- especially towards the 

 basi-tergal angle — is much more rounded than in the other species. The tergum is more 

 elongate in the direction from apex to spur; hence the basal is much longer than the 

 cardial margin. The .strongly-developed and broad articular ridge dues not reach balf 

 way to the scutal margin (as in Balanus corolliformis), but only reaches along the firsl 

 third of the scutal margin; the crests for the attachment of the depressor muscle are m 

 distinct than in the other species. 



The valves are not covered by a thick woolly membrane, as was the case in 

 the foregoing species; the growth-ridges are bordered by yellow membrane, which is 

 hairy, as in the case of the compartments. The size of the specimens of this species is 1>\ 

 no means so considerable as in the foregoing species. The flattened specimen attached 

 to the Echinus spine is only 15 5 mm. high ; the greatesl diameter <>i the narrow base is 

 only 13'5 mm. The smallest specimen shows a base of 1 1 mm. diameter, and hut a 

 height of 9 "5 mm. 



The structure of the mouth is much like the same part of Balanus corollifm 

 The /((brum (fig. 13) does not present differences, except in being much shorter: the 

 mandibles (fig. 14) have the fourth teeth very small, and almost forming a part of the 

 step-like process at the inferior angle. The maxillce (fig. 15) are exactly the same: at 

 least one of them, for the two of the same specimen are not quite equal, the one 

 having a much wider notch behind the great upper spines than the other. The outer 

 maxilla' present no differences. 



The cirri are in all respects formed after the same t\ pe as in Balanus corolliformis; 

 however, there are little differences in the number of the segments as well as in 

 that of the spines. So the first pair has also two equal rami, which, however, have 

 eleven segments. These details are, however, of no importance, as the specimen, the 

 animal of which I dissected, was the smaller of the two, and probably not quite full- 

 grown. 



This species was taken during the cruise of H.M.S. " Triton." at Stat ion No. 1 (" Triton " 

 cruise), August 24, 1882; lat. 59° 40' N., long. 7" 21' AY. ; depth, 516 fathoms; 

 bottom, mud ; temperature, 46° to 46° '5. 



