1862.] \V6 



piece may be the mandible. Finally the last and largest lateral tooth I 

 would consider as the lateral angle of the cephalic shell and the place 

 where the antenna, of which not a rudiment however is perceptible here, 

 is generally inserted. (Mr. Corjuerel considers this last tooth as the man- 

 dible.) 1 hus, the mandibles soem to be closely connate with the cephalic 

 shell and not susceptible of any independent motion. The oral opening 

 is only a small transverse slit on the anterior sharp edge of the head. Ex- 

 cept the above mentioned sutures on the underside, the surface of the 

 head is perfectly smooth and shining, above and below. No ocelli are 

 discernible. 



l^'ie two Jiraf thoraric s^rgmniti^. are longer, broader, and somewhat stout- 

 er than the abdominal ones; the first is a little narrowed anteriorly, the 

 second almost square; the third segment is transverse, but little broader 

 than the abdominal ones, and exactly like them in shape. The fust seg- 

 ment of the thorax has, on each side, laterally, a brow*, horny, polished 

 spot; it has, besides, in the middle of the dorsal, as well as of the ventral 

 side, two similar spots, having the shape of an inverted comma, and deep- 

 ly striated on their broader end; they j;re placed longitudinally, ] arallel 

 to each other; the space between them is occupied by a square, opaque 

 spot of a velvety appearance. 



The second thoracic segment has, on its dorsal side, two pale brown, 

 horny, elongated, closely approximated, deeply striated spots, enclosed in 

 a horse-shoe-shaped, opaque, velvety band; the ventral side of the seg- 

 ment has exactly the same structure, only the two striated spots coalesce 

 here in one. The thoracic stigmata, placed on the sides of this segment, 

 are very distinct. 



The ((bdomlnaJ segments are nine in number; the three first are trans- 

 verse, broader than they are long; the following are smicwhat longer, so 

 that the sixth, seventh and eighth are almost square; each of the segments, 

 except the ninth, has a pair of dis inct stigmata placed on the sides, close 

 under the margin of the preceding segment. The four anterior ones have, 

 near the anterior margin, a narrow, opaque, velvety band and behind this 

 band, a small, horny, transverse streak of undefined outline, covered with 

 fine longitudinal striae. The four following segments have, instead of the 

 velvety band, a larger, triangular or semicircular spot of the same nature. 



The ventral side shows exactly the same structure. All the velvety 

 spots show in a certain light, a golden, sericeous reflection. 



The ninth or last segment of the abdomen is a little broader, although 

 not longer, than the preceding ones, rounded at the tip; its basal portion 

 is of the same color and consistence with the other segments; its tip is 



