132 D1CHELASPIS ORTHOGONIA. 



thing else known : the outline of this cup is semi-oval and 

 crescent-formed ; it is moderately deep ; it is formed by 

 the external lamina of the carina bending rectangularly 

 downwards and a little outwards, whereas the inner 

 lamina of the lower part (which is slightly concave), is 

 continued with the same curve as just above, and forms 

 the concave chord to the semi-oval rim of the cup. This 

 cup, I believe, lies under the points of the basal segments 

 of the scuta. 



Peduncle unknown, probably short. 



Length of capitulum, above T Vths of an inch. 



Mouth. — Labrum with the upper part highly bullate, 

 and produced into a large overhanging projection ; crest 

 with a row of rather large bead-like teeth ; palpi small, 

 their two sides parallel, very sparingly covered with long 

 bristles. 



Mandibles, narrow, produced, with four teeth, and 

 the inferior angle produced into a single strong spine : 

 the distance between the tips of the first and second teeth 

 almost equals that between the tip of the second tooth 

 and of the inferior angle. 



Maxilla with three large upper unequal spines, beneath 

 which, there is a deep and wide notch (bearing one spine), 

 and the inferior part projects highly, bearing three or 

 four pairs of spines, and is, itself, obscurely divided into 

 two steps. 



Outer Maxilla, very sparingly covered with bristles ; 

 outline, hemispherical. 



Cirri, — The rami of the five posterior pair are extremely 

 long, as are the pedicels ; the segments are much elong- 

 ated, with their anterior faces not at all protuberant; 

 each bears five pair of very long and thin spines, with an 

 excessively minute one between each pair ; the dorsal tuft 

 consists of very fine and thin spines. The second cirrus 

 has its anterior ramus not at all thicker than the posterior 

 ramus ; but has an exterior third longitudinal row of 

 small bristles. First cirrus, separated by a wide inter- 

 val from the second pair ; very short with the two rami 



