No.417.] WORTH-AMERICAN INVERTEBRATES. 751 
42. Two equal bristle-like toes; these not more than half the 
length of the body . . Rattulus 
ez. Lorica loug-cylinidvieal, uentos ; anterior margin of the 
lorica with a single prominent tooth on the left side, and with 
a number of crenulations ; toes very nearly half the length of 
the body, each with two substyles at the base 
176, R. tigris Müller (Fig. 125) 
e2. Body shorter, cylindrical, with two deep furrows encircling 
it just in front of the middle. Toes very short (less than 
half as long as the body is thick), and frequently retracted 
within the lorica, so as to be concealed 
177, &. sulcatus Jennings (Fig. 126) 
4j. Two unequal bristle-like toes, the shorter being more than 
half as long as the longer. (Additional short substyles may be 
present) . Coelopus (or Diurella ?) 
er. Body holt xd thick (abest adf: as thick as long); curved, 
with a ridge on the right side ; one or two short teeth at the 
anterior margin of the lorica; longest toe almost or quite 
half the length of the body, the other little shorter ; four sub- 
styles in addition to the two toes 
178, C. porcellus Gosse (Fig. 127) 
e2. Like the last, but ses pid about one-fourth as thick as it 
islong i . + 179, C. tenuior Gosse 
e3. No teeth at initio margin " lorica ; body curved, cylin- 
drical or fusiform ; no ridge ; the two toes nearly equal, not 
quite so long as ilis body is thick 
180, C. dbrachyurus Gosse (Fig. 128) 
£5. Lorica cleft down the middle of the back by a fissure, whose 
sides are united by membrane ; open at both ends for the projec- 
tion of the head and foot. Toes blade-shaped 
Family SALPINAD/E 
dr. Lorica only slightly developed, covering only the dorsal half 
of the body ; median fissure not strongly marked (resembling 
the species of Furcularia, Nos. 117-121). Oneeye  Diaschiza 
eZ. Minute, swiftly moving ; body short, cuneiform or cylin- 
drical ; head broad ; lorica covering only the posterior third 
of the body ; median fissure broad, inconspicuous 
181, D. lacinulata O. F. M. (Fig. 129) 
e2. Larger, body laterally compressed, arched dorsally ; toes 
equal in length to the height of the body, curved toward the 
dorsal side . 182, D. semiaperta Gosse (Fig. 130) 
d2. Lorica well divelóged, an oblong box enclosing the body, 
Open at both ends and distinctly cleft down the middle of the 
back ; furnished with spines or teeth at the anterior or pos- 
terior margins or both ; one eye . . + Salpi 
