580 



MRS. E. W. SEXTON ON THE 



long apical seta?, and, lying Hat against the primary, was hidden 

 by a coating of dirt. In his third specimen both the supeiior 

 antennfe are missing. 



Inferior Antenna. — 3rd joint of the j^ednncle short, as bi'oad as 

 long, with a cluster of very long setje on the inner angle and 1 

 long sensoiy spine above. The 4th joint is twice the length of 

 the 3rd, slightly longer than the 5th, both beset with clusters of 

 the long, cleft- tipped seta? and smaller setiform spines. Flagellum 

 shorter than the 5th joint, composed of 4 joints, the 1st much the 

 longest, almost equalling in length the two following taken 

 together, each carrying, in addition to the set£e, a pair of strong 

 spines setting out on either side. In the small specimens the 

 flagellum is 3-jointed. 



Oral Parts. — The description is taken from the fully adult 

 specimens 5-6 mm. long, but the structure is precisely the same 

 in the small animals, the only diflerence being the lesser number 

 of spines and setfe. 



Upper Lip) (fig. 4) thick, subquadrate in form, much arched 

 above ; apex emarginate, slightly asymmetrical. In the figure the 

 lip is turned a little upwards to show the emargination of the 

 apex. 



Loicer Lip (fig. 5) as in the type species. 



JIandibIe^{S.g. 6). — Cutthig-plate on the right mandible curved, 

 margin divided into 3 teeth, the lowest much produced ; in 

 two specimens the mai-gin was entire, the middle tooth not being 

 developed ; accessory -plate narrow, in some specimens scarcely 

 wider than, and not as long as, the 1st spine of the spine row, 

 produced below to an acute tooth covered with microscopic 

 tubercles, and provided with a small tooth above. In the left 

 mandible the cutting-plate has 4 teeth, the second small, the 

 lowest the largest ; the accessory -pi ate is strong, much bi'oader 

 than that of the right mandible, the mandible divided into 



3 teeth, the upj^er and lower of which are large, the middle one 

 small. There are 7 spines in the spine-roiv in Chevreux's 

 specimens, 8 in Grube's largest, the first 3 being unusually 

 large, wide at the base, flat and furry in appearance owing to 

 being covered with microscopic spinules. The molar is very 

 prominent ; the crown transversely ridged Avith rows of teeth, 

 edged with flat spinules, "vvith 1 long, feathered seta above. 

 The jxdp is very large ; 3rd joint the longest, tipped with long 

 serrate bristles, with a double row of smaller ones extending 

 down the distal half of the inner margin ; the outer margin has 



4 groups of long serrate bristles inset. 



Ilaxilla 1 (figs. 7-9). — Inner plate large, with 1 long plumose 

 seta inset ; Grube notes the absence of this seta (p. 404), 

 but his specimen is so covered with mucous dirt as to render it 

 difficult to see details cleai-ly ; not only is the seta present, but the 

 new one can be seen under the old loose skin, the animal, as 

 before stated, being ready to moult. Outer 2^i('ie cui'ved, with 

 11 strong spines, 4 of which are bifurcate (fig. 8), the rest 



