REPORT ON THE CTRRIPEDIA. 103 



of the membrane covering the valves, the different shape of the carina! latera, the short- 

 ness of the peduncle, and finally, the totally different form of the complemental males, ha\ e 

 forced me to describe and regard them as different. 



Capitulum consists of fourteen valves, and is very flat. The membrane which 

 covers the valves is thin, and permits the margins of the valves to be clearly seen ; it 

 is furnished with microscopic spines only. The upper parts of most of the valves are not 

 covered by membrane. 



Scutum broad, about once and a half as long as broad, convex, quadrilateral, with the 

 occludent margin slightly arched; tergal margin hardly hollowed out, lateral margin 

 almost straight, basal margin straight also ; the angle where the lateral and basal marg 

 meet is truncated for the reception of the apex of the infra-median latus. The umbo is 

 at the apex, which slightly projects over the tergum. 



Tergum long-oval, the area it covers is about equal to that covered by the scutum. 

 A considerable part of the apex projects freely ; it is truncated, having been broken 

 off. The occludent margin is straight, the carinal margin arched, a little stronger than 

 the scutal margin. Basal angle pointed. 



Carina simply bowed, with the roof not quite flat, though flatter than in ScatpeHum 

 da/rwinii. Roof narrow at the upper end and gradually increasing downwards. Sides 

 making with the roof an angle a httle greater than 90°, showing almost the same breadth 

 at the lower end as close to the apex. 



Upper latus with a distinct though short carinal margin, hence quadrilateral J I 

 margin arched. 



Rostrum small, triangular, with the apex high up between the rostral sides of the 

 rostral latera. 



Rostral latus trapeziform, with the scutal margin parallel to the basal margin ; 

 the rostral angle not projecting beyond the scutum. 



Infra-median latus triangular, with nearly equal sides and a long basal margin. 



Carinal latus with the apex slightly recurved, triangular ; with the upper margin 

 hollowed out, and with the carinal margin distinctly convex. The basal margin is short, 

 and forms an angle with the lateral margin. The basal part of the carina is triangular, 

 and placed between the two carinal margins of the two carinal latera. 



Lines of growth of all the valves as in Scalpel/ um darwinii; they may be seen in the 

 figure. 



Length of the capitulum, about 40 mm. 



Peduncle little more than half as long as the capitulum (23 mm.), in both specimens 

 of an irregular shape, caused by an excrescence in the largest specimen at the carinal side. 

 and in the other specimens situated more laterally, in the upper part the transversely 

 elongated scales are totally covered by membrane ; in the lower part, however, they are 

 distinct. 



