REPORT ON THE CIRRIPEDIA. 107 



occludent margin almost straight, the basal margin straight, the lateral margin slightly 

 convex, and the tergal margin hollowed out. The umbo is at the apex, which in younger 

 specimens is produced and pointed, in older ones broken off, hence blunt. 



Tergum very large, triangular. The scutal margin is almost straight, only slightly 

 convex; the occludent margin is straight, the angle which it describes with the scuta] 

 margin is a little greater than 90°. The third margin of the triangle is the carina! 

 margin, which is very convex. It adjoins the carina for a little more than half its length; 

 a considerable part therefore extends above the apex of the carina. In all the larger 

 specimens the apex of the valve is broken off. 



Carina very robust, with the umbo at the apex, which does not penetrate between 

 the two terga. The carina is considerably bowed, and increases much in width from the 

 apex to the undermost part. The roof is not (mite flat but laterally rather convex. The 

 sides of the valve are not much developed, and are about at right angles with the roof. 

 The lower extremity of the valve is triangular, and penetrates between the two carina] 

 margins of the carina! latus. 



Upper latus large, quadrangular, with the scutal and tergal margins aboiost of the 

 same length, and the carinal and basal margins also nearly equal The umbo is at 

 the apex. 



Rostrum very small; it is separated from the opening between the two scuta by 

 the umbones of the rostral latera. The shape of the rostrum is nearly oval. 



Rostral latus broad but rather low; it has the shape of a trapezium, the basal and 

 scutal margins being the two parallel ones. A ridge starting from the umbo divides the 

 valve into two triangular parts. 



Infra-median latus triangular, with the umbo at the superior extremity. 

 Carinal latus of a rather irregular shape, and much resembles that of Scalpelht/m 

 <ji<jas. The umbo is at the apex, which is beaked and distinctly recurved. The upper 

 margin is hollowed out, the carina! margin convex. A rather prominent ridge is given off 

 from the apex, and divides the valves into two triangular parts ; of these one is 

 a distinct latus, the other belongs rather to the carinal side of the capitulum. The latter 

 part is divided into two parts by a less prominent ridge, which divides that half into 

 two unequal parts, the narrower being the one which is separated from the carina by 

 the carinal margin. In the full-grown specimens the carinal margins of the carina] 

 latera meet each other at the base of the carina ; in the younger they seem to be 

 separated from each other by a narrow and uncalcified or incompletely calcified part, 

 which probably represents a sub-carina. 



Length of the capitulum 37 mm., breadth 26 mm. 



Peduncle rather short (22 mm.), cylindrical, robust; covered by membrane. Scales 

 numerous in the superior part, totally covered by the membrane; in the inferior pari 

 only their edges are distinctly visible. Scales placed in numerous (eleven) longitudinal 



