P/ECILOPODA. 
•269 
Some of them whose feet are free, and (the two last excepted) 
annexed to the anterior part of the body — Cephalothorax, Lat. — 
covered by tlie shield, in which some of the posterior feet are fur- 
nished with numerous and pennated threads, and in which the siphon 
is not apparent, have the abdomen naked above and terminated by 
two long threads, or as many styles; they compose the subgenus. 
Caligus, so called , — Caligus riscuuts, Leach * * * * § . 
In all others, the superior surface of the body is imbricated, or that 
portion of the body is inclosed in a kind of case formed by the last 
feet which resemble membranes and fold over it. 
Of these latter, there are some whose antennse never project like 
little claws, whose feet are free, and whose last ones do not envelope 
the body like a membranous case. They form the following sub- 
genera. 
Pterygopoda. Lat . — Nogaus? Leach. 
Where the posterior extremity of the body is terminated by two 
kinds of fins; where the under part of the post abdomen or of the 
second division of the body, not covered by the shield, is furnished 
with pinnated or digitated feet; and where there is a distinct pro- 
boscis or rostrum f. 
Pandarus, Leach. 
Two threads at the posterior extremity of the body; the first and 
fifth pair of feet unguictilated, and the remainder digitated ; no ap- 
parent siphon 1. 
Dinemoura, Lat. 
Two long anal filaments and an apparent siphon ; the two anterior 
feet unguiculated'; the two following ones terminated by two long 
toes, and the remainder membranous leaflets §. 
The last subgenus of this subdivision, that of 
Anthosoma, Leach, 
Approximates to Dinemoura in the presence of a siphon, and in 
the two caudal threads; but it is removed from it, as well as the pre- 
ceding ones by its projecting antennae, which resemble little mono- 
dactyle claws, and by its six last feet which are membranous, 
to conclude that these threads are a kind of external oviducts ; but is there no 
mistake in this ? I have studied these same organs in various speeimens — preserved 
in spirits, it is true — but could never discover any body whatever. 
* Caligus piscinus, Lat.; Cal. curtus, Miill. Entom. XXI, 1, 2; Monoculus pis- 
cinus, L. ; Cal. Mulleri, Leach ; Desmar., Consid., L, 4; found on the Cod. The 
Oniscus lutosus, Slabber, Encyclop. Method., Atl. d’Hist. Nat. CCCXXX, 7, 8, from 
the fin-like appendages of its tail, seems to indicate a separate subgenus. The 
Binocle a queue en plumet, Geoff., might be placed in it. 
•f- A single living speeies found on the Shark. See the genus Nogaus, Desmar., 
Consid., p. 340. 
X Pandarus bicolor, Leach; Desmar., L. 5; Pandarus Boscii, Leach, Encyc. Brit. 
Suppl. 1, XX. For the other species, see Desmar., Ib., p. 339. 
§ Caligus produrtus, Miill., Entom. XXXI, 3, 4; Mbnoculus salmoneus. Fab. 
