782 CHAELES PAUL ALEXANDER 



except for those near end of body, which are asymmetrically once-forked. Basal half of pro- 

 jections heavily chitinized, but distal end almost transparent. Entire surface of projections 

 beset with numerous transverse rows of short hairs, usually about nine to twelve hairs in each 

 row, nine and ten being common, these hairs doubtless serving to hold the blackened, horny 

 covering of the projection. Sensory papillae (Plate XVII, 34) borne at or near apices of pro- 

 jections, each with a long bristle; these papillae narrowed at base, thence enlarged to form 

 a head, on which bristle is inserted; usually one or two bristles to each projection, but 

 occasionally an additional one present, which is much smaller and degenerate. Dorsal 

 body projections occupying transverse rows across segments, those near lateral and caudal 

 parts of body being long and powerful, those on median region being short and degenerate; 

 segments of thorax and abdomen subdivided into false segments, these transverse rows 

 occupying caudal margins of these segments, there being usually from four to six of the 

 weak projections between the powerful lateral ones. In addition to these projections, sparse 

 branched hairs lying in the same transverse rows (Plate XVII, 35). Projections at end of 

 body surrounding base of breathing tube all long and powerful, and, as stated above, some 

 weakly bifurcate. Ventral body projections similar to those of dorsumbut relatively smaller. 



Abdominal pseudopods feebly chitinized at tips, with very large, slightly curved claws 

 which are but little shorter than the pseudopods themselves (Plate XVII, 32). Breathing 

 tube short and stout, surface before apex transversely wrinkled. Papillae rather numerous, 

 bearing sense hairs scattered over surface of tube, those just back of apex short and spine- 

 like, those farther back long and slender, very like and homologous to the bristles terminating 

 the body projections, as discussed above. Gills two, stout, about one-third length of terminal 

 section of breathing tube. Body projections incrusted with a black, horny substance, as 

 discussed above; on lateral projections, apical setae likewise incased, at least basally, pro- 

 ducing a bilobed or even a trilobed appearance; this black corneous incrustation brittle and 

 easily removed, leaving projection and bristles intact. 



Head subquadrate, sides nearly parallel, occipital foramen ventral in position (Plate XVI, 

 26); surface of head covered with numerous small, chitinized points which are longest on 

 posterior angles; anterior ventral angle slightly produced; two setiferous punctures on 

 ventral surface, one on either side just behind anterior angles, the other closer to foramen. 

 Dorsum with setae arranged as shown in Plate XVI, 27; setae simple. Labrum (Plate XVII, 

 31) with four dorsal setiferous punctures along anterior margin, the median pair closely 

 approximated; another powerful seta occupying each lateral angle on dorsal side; dense 

 brushes of long hairs on either side beneath. Epipharynx (Plate XVII, 31) supported by two 

 powerful chitinized arms connecting across midventral region and then extending laterad 

 and expanding outwardly to form posterior margin of labrum; surface of epipharynx with 

 closely appressed teeth. Labium (Plate XVI, 28) with cephalic margin of mentum almost 

 entire, the broad median part produced cephalad and feebly bilobed; palpi with a dense 

 fringe of long hairs around base and with sensory papillae at tips. Antenna (Plate XVI, 

 30) short, cylindrical, somewhat globular or barrel-shaped; about four elongate papillae 

 and two or three shorter ones, these papillae terminal in position, the largest one occupy- 

 ing the inner side. Mandible (Plate XVI, 29, 30) with the outer angle a powerful hook 

 bearing smaller teeth on ventral face at about midlength; inner angle flattened, and, besides 

 terminal blade, bearing a comb of about five teeth, the innermost being the longest and 



