PCECILOPODA. 



447 



filaments at the extremity of the body as ovaries. I have sometimes found the eggs beneath the posterior branchial 

 iegs, but never in these tubes. In other cases, the externa] ovaries, thus elongated, are only found in those fi 

 which lay their eggs in holes or deep burrows; whereas this is not the case with the Caligi, Mailer and other 

 zoologists have observed that these Crustacea trim and agitate these appendages. We believe, together With both 

 the Jurines, that thej serve for respiration, in the same manner as the anal filaments of Apus.* 



The species of the restricted subgenus Caligut (including RUeuhu, Leach) have all the legs free, and attache. I, 

 with the exception Of the two last, to the anterior part of the body (cephcUothorax, Latr.), covered by the shield ■ 

 and some, at least, of the feet are furnished with numerous filaments. The siphon is not distinct. The abdomen 

 is naked above, and terminated by two long filaments or two Btj les. Ct/ii/it.s pitcinuM, Latr. ; C. curtus, Miill. ; 

 MonoeiUus piteinut, Linn. The Uniscus lutosus, Slabber, ought perhaps to form a distinct subgenus, on account 

 of the fin-like appendages. The Binocle d queue en plumei of Geoffroy may be introduced into this subgenus. 



[Messrs. Pickering and Dana have published an extremely elaborate description of a species of Caligus ii 

 canut) found upon the Cod, as many as forty or more individuals occasionally occurring on a single fish ; but they 

 are never found within the gill covers. The figures illustrating this memoir have never been surpa.^cd. 



[M. M. Edwards has published a memoir upon this genus in the AmuUei ties 8i lencet NatureHet, especially with 

 reference to the structure of the mouth]. 



In all the other subgenera of Caligus, the upper side of the abdomen is imbricated, or this part of the body is as 

 though it were inclosed in a kind of case, formed by the terminal feet, which resemble membranes, and are turned 

 upwards. 



Pterygopoda, la.tr. (Nogaut? Leach), has the posterior extremity of the body terminated by two fin-like ap- 

 pendages. It has digitated feet on the under-side of the post-abdomen, or second division of the body, not covered 

 by the shield, and a distinct beak. Founded upon a single species, found on the shark. 



Pandarus, Leach, has two filaments at the posterior extremity of the body. The legs, of the first and fifth pairs, 

 are unguiculated, and the others digitated. The siphon is not distinct. Pandarus bicolor, Leach ; P. lioscii, 

 Leach, &c. [Two other species of this genus have been described and figured by Dr. Johnston, in the Mage 

 of Natural Uitlory, vol. viii.J 



Dinemoura, Latr., has two long filaments at the anus, but in which the siphon is distinct. The two fore-legs 

 are unguiculated; the two following are terminated by two long fingers; the others are in the form of membranous 

 I: iflets. C. produetut, Midler; M. salmoneus,l'ubr. 



Anthoeomo, Leach, approaches the preceding, as regards the existence of the siphon and the two anal filaments ; 

 but it recedes from it, as well as the two precedimr, iii its antenna', of which two are directed forwards, in the 

 shape of small monodactyle claws, and in the six hind-legs, which are membranous, folded upwards, at the sides, 

 upon the post-abdomen, which they envelope. The first and third pairs of legs are unguiculated; and the second 

 terminated by two short, obtuse fingers. Anthotoma Smithit, Leach. 



[Nemeeit, Kisso, is a curious genus, of a narrow form, with the anal filaments many times longer than the entire 

 body.— See Pol. Rout, Crux/. Medtter., pi. '20.] 



In the second subtribe of the Caligidcs, the body is oval, without exserted anal appendages, in the 



form of filaments or fin-like scales. A portion of the superior integuments composes in front of the 



body a shield, which does not cover the anterior half, narrower than it, rounded, and notched anteriorly, 



dilated and bilobed at the other end, succeeded by three other pieces, or rounded scales, posteriorly 



notched, the second of which is the smallest, being in the shape of a reversed heart; the last is the largest. 



The four posterior legs are in the form of plates, united in pairs ; those of the Brat and third pairs arc 



unguiculated; the second are bifid at the tip. The siphon is apparent. The eggt ar< covered by two 



large, oval, contiguous, coriaceous pieces, placed beneath the abdomen, and surpassing it in length. 



Such are the characters of the genus 



rapt, Leach, of which a single species is only known, which has been found fixed to the branchi.e of the 

 tu .ny and turbot. ('. Lalnilh-i, Leach. 



The second of the tribes of the Siphmottama — that of the Lkun.imkoiimes, I.at., — is composed of 

 Entomoatraca still nearer allied than the preceding to the Lerneess. The number of the '■ not 



clearij exceed ten, (but there is perhaps another pair still more minute), and these organs are, for the 

 mosi part, verj simrt, and unfitted for swimming. Sometimes the body is nearlj vermiform, cylindric, 

 with the anterior legmenl simply a little wider, ami furnished with two didactyle advanced claws, and 

 t him-, in consequence of two Lateral expansions in the shape of lobes ox wings, directed behind 

 the thorax, ami of the two ovaries, which are posterior, it forms a small qnadrilobed mass. This tribe 

 comprises two gen 



• I* ih« ihiH v.dume of the ,-inn.if. itrnrr. Art Set. Viyiiq., p. 343, 



, tin-re buainct from tht obMwmtiou "f l*r. 



Sururiv.nl""> Iht tOHOi Of » ij ■■<•!• (C. Wun^-ifiiiP) whirh 



U rcry < ommoo opoa Ihi oporcalum ■ ii#. TUi naturallti 



I enuhtd the uml : . he ob- 



II ,ii, .in «ml triuiipircut 



Blftttng » living fo-lut, very different from It* parent, and i.f which he 

 gi\c« n detail Prom I 



., , in I., bf Ulmil I ( 'Ut li ther. mi it, i, 



•HI. nic nl ' 1 h«v li trr.t n. , many 



.l.ilii true, in tpmtt uf wine— hut I 



yet dU c OTf f td "iii; I ! In them. 



