REPORT ON THE CIRRIPEDIA. 101 



umbo to the angle where the basal and lateral margins meet, a curved line, with its hollow 

 side towards the upper latus, minks the place where the valve is thickest ; the lines of 

 growth, which are rather distinct and run parallel to the basal and lateral margins, start from 

 this curved line. The occludcnt margin is much arched, the tergal margin is hollowed 

 out, the lateral margin is slightly arched, the basal margin is straight. 



The tergum is very large, and has a much greater area than the scutum. It has an 

 oval shape with a pointed apex and basal extremity. It is divided into two longitudinal 

 parts by a slightly curved line running from the apex to the under angle. The lines of 

 growth starting from this line run parallel to the scutal and carina! margins. The occlu- 

 dent margin is straight, the carinal margin arched ; the scutal margin near the scutum 

 is arched, near the upper latus hollowed out. 



The carina is siruply but very strongly bowed, the apex is at one-third of the length 

 of the carina! margin of the tergum from the apex of the tergum. The roof is almost 

 flat, being only slightly unequal through a not very distinct longitudinal ridge over the 

 middle of the valve. On both sides the roof is bordered by a very distinct longitudinally 

 furrowed ridge ; the lateral parts of the valve are almost at right angles with the roof. 

 The basal part of the roof of the carina is triangular, and penetrates as a wedge between 

 the two carinal margins of the two carinal latera. 



The upper latus is triangular, and has the shape of the sector of a circle, with a some- 

 what produced apex, however ; its scutal margin is slightly hollowed out, its tergal margin 

 is slightly convex. 



The rostrum is very small and totally hidden under the chitinous membrane. Its 

 exact shape I cannot describe, as I have not isolated it, and as the lateral parts are covered 

 by the rostral latera. 



The rostral latus has the umbo at the rostral extremity ; here the apices of the two 

 valves meet one another in front of the rostrum. The valve is short but broad, distinctly 

 convex, divided by a ridge starting from the umbo. 



The infra-median latus is triangular, with the umbo at the apex, which projects con- 

 siderably beyond the surface of the other valves. 



The carinal latus is of a very irregular shape, with the umbo strongly recurved and pro- 

 jecting beyond the surface of the valves, and sbghtly also beyond the line of the carina. 

 The carinal margin is almost straight, those of the two valves meet at their base and at 

 the same time at the base of the carina. A ledge starts from the umbo and divides the 

 valve into two parts ; the one is flat and situated at the base of the upper latus, the 

 other is curved and divided by a second ledge again into two parts, the greater one 

 beino- situated between the base and the carinal margin of the valve. This latter part 

 is of a triangular form. 



Length of the capitulum, about 43 mm. 



The peduncle measures nearly 20 mm.; its surface is furnished with not very numerous 



