o\ \ WCW ! I i: \-. M"K r.,\h I i: \~. I |. . 



line! from that which OCOUM in the old of ;in\ of the 

 lid:e. Here, a- el-culiere, however. :i -in-_:le ch:i r;icl eri -t ic 

 unite- the two; (In- -nliiivs :irc siinil:ir in both familie-. 

 Tin- similarities of the yoiin-j are BUCh M OCCOr Commonly 



between wluit are supposed to le Very widely -cpa 

 adults in many othef disiinet t':iniilies or Croups. 



(i el ills < >\N NO-I K Ki; As. H VMtt. ( ' ll.'l r.M e t e l'-> t hose , ,f t lie I'milily. 

 ( K^ NOT I. KI! AS (il I!', A I.I A MM. l*()rl. T. 111. \\^. 853, 65 I. 



To the nbove inusl he nddol t lit; followijlg geneni ehai'Mcter- 

 \/.^\ l.y the late IV,. 1'. K. I',. Meek : 



(ieiiii-- MOKTONK KKAS. Meek. Shell discoid ; periphery with n 

 single, simple, low, central keel, and a more or less defined sulcus 



on each si<lr of it. the snlci being genei-ally each margined exter- 

 nally 1>\ a row of compressed nodes; umbilicus wide; volutions 

 narrow, -lightly embracing, and ornamented by regular, simple. 

 si might, tnbercnlated costffi. 



A)pareiitly (Vetaceous only ( l'inti',1 States, India}; whilst the 

 restricted genus Annmim'tr* is probably confined to the lower 

 members of the .lura-sie system. 



A.. VE8PEETINU8, Morton = A. TKXANTS. Roemer. T. li)."i, 

 ti--. 586. 



. mis I'RIO.NOCV LI s. Meek. Shell discoid, with more or less 

 depressed periphery having a central keel defined by a con- 

 cavity on each side ; keel tit first simple, but at a later period 

 strongly crenate, and in old shells depressed <>r broken up into 



a row of elongated nodules; volutions more or less compre-^ed. 

 and but slight ly embracing : s:irface costate and tulu-rciilate ; 

 M-plM with alioiit three lateral lobes Oil each side, the lir-i of 

 which is loiin'i-r than the siphonal lobe and triprirtiti' at the end. 



while the others are much smaller and triiid. or the middle one 



sometimes bilid : first lateral sinus broad and bilobed. t he outer 

 lobe lapping purtly on the perijtheral side. 



AMMOMTI'.S SKIM? \TO-CA i: i NA'IM s. Meek. (Vetaccous. / '/, 

 Stab 



Sllbgenils I'llloNoTKolMS. Mrck. Shell wliel) Vel'X yollllg. with 



e sh.-irply defined, and as the whorls increase in -i/e, I.ecom- 

 ing more distant, without having the intervening -paces occupied 



