REPORT ON THE CIRRIPEDIA. 117 



The scutum is almost triangular, the basal and lateral margins forming almost a 

 continuation of each other. The occludent margin is slightly arched, the tergal margin 

 is straight, the lateral and basal margins form together an undulating line. The umbo 

 is at the apex. 



The tergum is large, with the occludent margin convex, the scuta! margin slightly 

 hollowed out, and the carinal margin slightly convex in the undermost, and hollowed 

 out in the uppermost, part. The umbo is at the apex, which is distinctly recurved. 



The carina is simply bowed, with the roof Hat. The roof only slightly increases in 

 width from the apex towards the base, and is bordered on each side by a distinct ridge. 

 The valve is furnished with distinct lateral parts, which are at right angles with the roof, 

 and increase much in width from the base upwards. 



The upper latus has a very characteristic shape, with the umbo seated about in the 

 middle of the scutal margin. It has about the shape of the greatest half of a pentagon, 

 and it is limited by five sides; the longest is the scutal margin, then follows the carina] 

 margin, then the margin between this valve and the carinal latus, then the tergal 

 margin, and finally comes the shortest of all, viz., the margin between it and the 

 rostral latus. The third and fifth together form the basal margin of the valve. 



Of the valves of the lower whorl, the rostral and carinal latera, though not very 

 wide, are well-developed ; the infra-median latus, however, is extremely narrow. 



The two rostral latera meet one another below the occludent margin of the scuta, 

 with long rostral margins. The umbo is at the apex, and projects distinctly over the 

 edge of the scutum. Each rostral latus is divided into two triangular parts by a ridge 

 r unnin g from the apex to the hindermost edge of the basal margin. 



The infra-median latus is extremely narrow ; its umbo is seated at a small distance 

 from the apex, and projects a little over the surface of the valve. The valve slightly 

 increases in width from the apex to the base. 



The carinal latus is pentagonal. Its umbo is at the base of the carina, and projects 

 distinctly over the hinder margin of the carina. The valve is divided into three triangles 

 by two ridges starting from the umbo. Of these triangles the uppermost is by far the 

 greatest. The carinal margin is divided into two parts, one above the umbo hollowed 

 out and longer, the other beneath the umbo short and nearly straight. 



Length of the capitulum, 12 mm. 



The peduncle is short, 3 mm. only, and totally covered by calcareous scales. Of 

 these about eleven are placed in a longitudinal row, the number of these rows being also 

 about eleven. As a prolongation of the peduncle a chitinous membrane covers a part 

 of the horny thread by which the specimen is attached, and this membrane presents also 

 some small calcareous scales. 



The structure of the animal contained within the capitulum has not been investigated, 

 nor have I been able to make out whether complemental males were present or not. In 



