l;i(i JIoNOGKAril (IF ISIUTISU LAND ANll FlSESllWATHl! MoLU'SCA. 



CiKNUs MIL AX Cniy. 



(Anulia, A[o,|uin-T.iiuloii ; L:illem.inlia, Maljillc). 



The genus MUk.v (M/7(I,i\ a word 

 formed liy a. traiisliteratiuu nf Liimi.r) 

 Avas instituted liy l>r. (rray in tlie 

 ("at. l\ilninii. l^iit. Mils., piiblislied 

 111! ]\Iay 1st, IS."].'], Iiiit in whieli tlie 

 lirot'ace was dated Mai'ch :.".)tli. 



Tlie teini Miln.r antedates 

 i\[(:]i[iiin-Taiidon's iiaiiie ni' Ai/m/id, 

 wliieli was pulilislu'd in Ins " Hist. 

 :\I(ill. TeiT. et Fliiv. iM-am-e," ii., 

 p. 17, (111 ^Jept. lotli, l.s.']."]. The 

 jivefaee tci that worl;, thmigli dated 

 Ahii'ch l.'ith, was re.-dly issued with 

 the third part mi Awj;. 1st, while 

 tlie fdiirth jiart, in whieli the term 

 AiiKilid was hi'st instituted, did iidt 

 appear until Se})t. IDth, l.s."].'i, the 

 inisleadin,!;' date ol' the preface t(i 

 the wcirk ha\iiig led tn tlie wrongful 

 nse of .1 iihiliii. 



With this genus Dr. .1. E. and 

 jMrs. Gray lia\'e lieen associated in 

 recognition of the institution of the 

 present group and (if the impetus 

 their etmcholdgical works jia.ve had 

 upon the popiil.-iri/.atKin of cou- 

 chdldg)' generally 



111 this cduutry we lia\e luit two 

 s]iecies, which, .-iltlidugh jil.-iced by 

 I'ollonera in s(>par;ite sub-genera. 

 Til iiihiiiiii and I'lni iiicd , do not shdw, 

 at least in liritish specimens, the 

 dillereiitial char.-iclcrs lie li.is as- 

 si-iicd td llieiii, but are, in fict, sumewhat cluscly allied in structure 

 and aspect, bill ;icc(jr(liiig to Dr. .Sinirdth, within certain limits, lui genus 

 is so iinstaMc in its drg.anizatiiin as is J/i/n.r, n giMiip wliicli, in liis 

 opinidii, is (inly ;il tlie diilsct df its Cdiirsc, in the ldriii;iti(in dt species 

 Idr tlic future. 



i/^.lL^^^ 



Generic Characteristics.— E.\'rKii\Ai,LY, in ,)///,/,,■ (li,> l„,dy is Idngi- 

 tiidinally gi'ddvcd, ;ind ,'iciitely keeled tlie whule lengtli id llie back. 'I'be 

 iMANTM'; is sli.-igivcned or dclic-ilcly wrinkled, be.-irs a, liliiiillv lent icnlar 

 or biirse-slioe sliaped gi-ooN'e, iiKire (i|- less ciinipletely (■iivninscribing ;i, 

 sdiiMAvbat. prdiiiineiit piist.ei-o-central part wliicli siuiulatA>s a. sinajler, 

 sii||i;i|id^e'l mantle; tlie Ii ivsiMii \'r(iii,v oKiFioK is pl,-ire.d on tlu> riglit side 

 beliind llie cciilic iif llie in.antle, and is imt. cut by the .anal cliannel. 



