782 CHARLES 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 serted; 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 dorsum but 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 
