300 KKI'OKT OK COMMISSIONS OK K1HII AND FISHERIES. 



rami, laperin<, r ai tin-, base and ciliated, Mio inner about one-third longer 



than (lie oilier. 'I lie |ileo|)od:, are (|lllle naked :IIM| de,,llliile of cilia. 



LeiM.dli :,'.". ; breadth, ; brea,dfh of pleon 1"""; length of head 3 mm j 



breadth l.'J""". 



A single specimen of Mils species was dredt;ed by tlio l^. S. l (1 ish 



< 'ommi. . ion, :ii)oui tit'iet-ii mile northeast of Oape Cod! } in i *> r.iiiioms 



brown mud, September 10, IS?!). 



XI, OTMOTHOID^B. 



I lend produced anteriorly o\ cr I lie basesof I lie :i n I en nil l;e ; ma \ illipeds 



fe\\ jointed, operoulifonn i oiandibles palpigerous) moidii snctoriMl; le^s 



:iini<'(l will) :,lioii" Clll'Vcd <l:ilsli; CpillKTil (lislilH'i lieliind llie lirsl, 



thoracic segment j iclson i.n'-c ;md flattened} picopods not ciiinicd; 

 uropods articulated aear the antero-lateral nn^ieN oi' die i;isi se^meid, 



:md composed of :i more or le,,,, flattened bilSill :.c" i inciil l>c;irni", |\vo 

 thdlened r:nni; Icilnl p;ir:i,sil ie; body ollcn uns} iniiiel ric;d by distort ion 

 in llie .ididl;;. 



'liiniiy is represented within our limits by ihi'c'e genera and as 



iii:in\ ;speei<-s. They :ire p;ir;isilie. in linbit, iisiisdly on ll,sh, nnd li\ tliem- 

 Helves by Ilieir StTODgly-OUrved rlawN to their host, ol'li^n \\ilhin lll(^ 



nioiil h , or .il.onl I IK- liriinclii.d e:i\ il \ , .111. 1 I rc( [ ucn I I \ become dislorlcd 



\\lien lidly ^i'o\vn. In .ill our BpeoleS UMI IM'JMI is siiiiill, and lias llu^ 

 .oilenoi iii.ii'-iii produced, concealing (lie b.ises of I lie anliMinnlai and 

 the antenna'. The head is I hreo-lobed behind, and llie lirst (horacie. 

 ; e incut is adapted to it. 'I'lic .inlennid.c and anlenna- are both short 

 and l.ipeuii", \\ilhoid \<a\ c\idcnl distinction iido pcdiincnlar and 

 llaj-cllai ..c^nu'idH. TliiH dislinelion is, lio\vn'(M - , usually more or less 

 e\ ideid on examinal ion. 



The epimera, HIT \\oll Mi^piinittMl, nxcept in llu" lirsi ,se,";inenl, and may 

 be pio|ecl in", and conspicnons. '^ll(^ lef;s are of neail\ tll(^ sam<^ lorni 

 I hi 01 1 "lion I, bill inei ea e m l.ai" ( h and become more .slcm I er posteriorly.* 



The btisal segments are in some genera euliirgod ami tiatiened, but not in 



ours; the joint bet \\een the basis and isehnim is strongly llexed, and 

 I lie ,.< ineiii ... al lea, ,| |.e\ oml |he i: .clim in , to t he daci \ Ins, a i e short and 

 capable of bill bnle motion on each oiliei 'I'lie duclylii.s is strongly 

 cm \ ed nnd a. I inn a I.I \ II (led for lit m adachmenl to the host on \\ In. li i lie. 

 animal imiy be h\iu In our species the !. iii the natural position, 

 aie concealed in a dorsal \ic\v beneath the body of the animal, to HUN 

 under surface of which they are appressed, the lirsl line,- pairs bcni". 

 directed forward, and I he last I luce back \vnrd, US ^(^p|escntcd in platt^ 

 \, llf;'. <i(>. 



Tin- jileon in our i' '.i.- is not suddenly narrower than (he thorax, 

 a,; it i.-i, however, a.l least in I he adnlls, in SOniO genera belonging to Miis 

 family. The se^ineiils of the pleon arc distinct, the last one sent ilorm 



In li hi-'li'iti ^i-\\ii\{i< I lie HivyiMll li | M 1 1 nl logS ' i 'nil lo I lir i>\ I iviml \ i>l I lir l.nl and 

 itli-nilfi , roin | u c ;i ad . i .1 \\ 1m I, ,, \\ il li .1 i.in:|||, ;ilinii:.| rudnii. nl .11 \ , :.l I .nv. Ill la \\ ." 



