i i : 



ipitulum is elongate, aboul twice as long as broad, flat. Ii is not covered by 

 membranc and the lines of growth of 1 1 1 * - different valves are not very distinct, Though the 

 i-ariiia is not strongly bowed, the carinal side of the capitulum is more strongly convex than 

 the rostr.il or occludent side. There is no rostrum, hence the total number of the valves is 

 thirteen. The scutum and the upper latus are "f considerable si/c and very peculiar shape 



The se u tu in is large; in consequence ol the shortness of the basal margin the shape 

 ui' the scutum is almost triangular. The occludent margin is straight, only feebij convex in the 

 upper part. lh<- tergal margin is rather long; it forms a small slightly recurved apex with the 

 occludent margin. The lateral margin lias a iltpri -^s.^-,1 angle slightly above the middle of its length. 



The tergum is medium-sized. lis occludent margin is convex; its carinal margin slightly 

 in the lower and hollowed out in the upper part; its scutal margin is feebly hollowed 

 out about the middle. The apex of the tergum is distinctly recurved, but blunt, not pointi 



The carina is rather long, reaching to , !i of the length of the carinal margin of the 



in. It is not strongly bowed and its sides are only well-developed in the upper part. The roof 



increases in width from the apex downwards; it is not bordered by ridges, but laterally convex. 



The upper latus is very large and of an irregular, elongate hexagonal shape. The 

 umbo is almost in the middle of the scutal margin, where a slight convexity fits into the 

 depressed angle of the lateral margin of the scutum. The length of the different margins can 

 een in the figure. 



The rostral latus is very small. its shape is distinctly pentagonal. Its rostral margin 

 is considerably longer than the lateral margin, which separates it from the infra-median latus. 



The infra-median latus has the umbo at the apex. It is a narrow and relatively 

 short valve. 



The carinal latus is irregularly pentagonal. Its carinal margin is divided into two 

 \ equal parts at an angle with one another. The upper part is hollowed out for the 

 ption of the basal part of the carina. The upper margin has a slight excrescence about its 

 middle point. The lateral margin is the shortest of all. 



The peduncle is short, cylindrical, slightly broader at the upper extremity. Its surface 

 bears rather broad and narrow scales placed in not quite regular rows: one at the carinal and 

 one at the rostral side alternating with one placed in the middle of the left and one in the 

 middle of the right side. 



Size. The total length ^i the specimen figured is 7.5 mm., that of the capitulum 6,6 mm. 



The study of the structure of the animal contained within the capitulum has yielded 

 the following results: 



Mouth slightly bullate. with the part directed forward rounded. Lab rum with a row 

 of small but distinct teeth, those in the middle of the row slightly larger and distinctly pointed. 

 Palpi slender, with a few short hairs along the outer margin and a couple slightly longer 

 ir and at the tip. 



Mandibles with three equally distant teeth and the distance between the third teeth 

 • tinated inferior angle very short. 



Maxillae with a distinct notch about the middle of the edge; with four spines. two of 



1 1.' 



