outward margin, giving to the posterior portion of the head some- 

 commences near the termination of the suture, extending back- 

 wards until it almost bisects the transverse one near the margin. 

 The Front between the eyes is raised to a line with them, assum- 

 ing in appearance somewhat the figure of a corona in high relief; 

 posterior to it is an elevated angle bearing a small tubercle of a 

 dark colour, resembling an ocellus ; between the anterior ano-les 

 of the eyes is also a reflected sinuous rim, rising to the same 

 height. AnienncB four, inserted one above the other by a tri-artic- 

 ulated peduncle into the sinus of the anterior portion of the head, 

 contiguous at the base, setaceous, a three-jointed clavola with a 

 terminal pluri-articulated stem, the inferior projects forward and 

 rises to an equal height, so that the four antenna? appear as if situ- 

 ated on the same line : superiorly, the segments are longitudinally 

 grooved, inferiorly crossed, the shortest by three, the second 

 six, and the external one by five ciliate elevations ; superior one two 

 thirds, and inferior one half, the length of the animal. Labrum 



attached to the r 



langulate, slightly punctate. 



two central depressions. The body of the Mandibulcc are s 

 what trapezate, with an angular dental process, armed, the one 

 on the left with two corneous teeth, placed one within the other, 

 that on the right contains but one, they arc convex externally and 

 internally concave, with a small foramen at their base. A pedi- 

 form three-jointed palpi is inserted into the base of the mandible, 

 the first segment about equal in length to its body, lies in a deep 

 groove on its anterior margin, the middle one corresponds in size, 

 termmal one half its length, subovate, dilated and compressed, 

 with a ciliate inferior edge. Maxillce, two pair, inserted at the 

 side of the mentum ; superior one simple, apex armed with six ri- 

 gid spines, arranged in a triple series : inferior, compound, the 

 upper lobe covering the lower externally, and is cleft almost to its 

 first articulaUon, giving to the maxilte the appearance of being 

 three-lobed : the apex of each is furnished with flexile spines. 

 2Vng«e linguiform, with an acute apex, cartilaginous, short and 

 retractile. The appendages corresponding to the first foot-jaws 

 approximate closely to a true lip, each being furnished with a pal- 

 pus,, they rise up to the mandibles, meeting each other at a line 



