i-n< IMTI.S. i-iN L<> -II 



A- pateozoic representatives are i ! n.-iinr.i - <////, 



///.<. Sandk; ln'ltinr,-ttliilu.<. S:uidl>. ; / ftdb.J ////. war. 



ili-lji/iiini.f, S:ilnlli. Since llic lohe^ of tlie^e form- ;IV.TCC ill I'oTm 



jkvith llio-M- til' '/<//>. ////./ W"/*//s, I'liill. Mini hiinilifiHtlii. S;indl>.. 



Sandlier^vr united liotli ^roups under tin- 11:11111- of I,u n<;nl<it i . 



A -imilar or independently agreeing development <>r iln- l.i..-- 



of dislincl. iii<l('|u'ii<lciil races i- not uii!Vri|iU'iit : :i strikiir. 

 Minjilr of siidi ;i p:ir:ilh'l iii(lc|icii(lciil <lc\ rlopnu-nt i^ |)n^-ntnl 



I iV J/-->V'S Mild riinn-in-*-ni.*. Gon. mi.i-iil'iliH* Mini liiniilirn.<hl. 



which ditl'cr from Lohifcx in llic bllild of the shell, and |r->-iil 

 itii's to rinni -nrr/v/s. ;irc :iccor(liim'l\ . 

 t'roin Lobites MS : ni indcpciidcnl L r 'n'i-ic 

 NilH' Trinssic spi-cirs :irc 



I.or.iTi-s Kij-irTicus, I:iucr. r l\ 



L. i>Ki,i > iiiNoi'i;i>ii \i,rs. Ihiiu-r. T. 1 1)7. tig. 621. 



(Jcnus PTYCHITES, Mojs. 



This iivnus.Mlso distinguished ly its lonjj; body-chamber, dill'crs 

 tVom An't'nti'Hi which it most ivscmMcs. principully in tin- st rnc- 

 tuiv of till' lol>es. The cxtcniMl lolc is very shallow and t he 

 external saddle rema rkably short ; the first lateral saddle on the 

 contrary is very hi^li. The sa<ldles are toothed and present in- 

 dications of the development of liranches. The smooth shell is 

 red with straight or undulating radial folds. Ptychites tails 

 into lleyrich's IMieose o-roup and Oppel's \\ uuifera, and is the 

 .incc^tral foi'in of Amalthenx. as shown by AmaUheus 8nf(>'ri. 

 di->co\t-re(l l.y M r. von Snt t ner at Munich. Furt her research^ 

 in i M lie awaited lielore it is possible to decide whet her the u'roup 

 ras i>l<thji>lnjlln in. Mojs. and florid n ID. \Viillen, is not 

 to 1'c re'j.-;irde<l as a u'enus descende<l from Phjcliitf* and ^eiieric- 

 ally distin<-t from Pinacoccm-. 



Six species from tin- Trias>ic niv riiunierated. 



Gknu PINACOCERAS, M-.j,-. 



Shell narrow, aperture hiu'h. smooth. M-ldom with knol'-like 

 enhir-rmcnts on the -urfacc. r>ody--lianil>er one-half to 

 thirds of a whorl lonir : aperture wit h >lnrt lolmlar prore^-s of 

 the.-onvex |io|-tion. Attaelmirnt ri nn' << >m mencinu r a short dis- 

 tance from the Mpert ure and extending to the post erior end of 



