I 'A 

 kumllM 



places this genus with /'...'/<;/'-/./ i .1. i>mi<l.i. < 'arpenter) and perhap- 

 jn-t 1\ . I. ut. ;us tln> family is not recognized by some couchologists and OH it is highly 

 prohuMe that tin- 1'aleo/oic |iat'll<>i.l -hells are more intimately related among 

 themselves than to it-rent type-, it, has seemed t> n- tin- widest to embrace them all 

 I>n>\ isionally in one Imiad family, the /'.//// iW./. 



I'M * y i: v in HIM-. //. ^//. 

 i I. \ ii i \ i. I n. s ift-M. 



Shell depressed rimif.il, rather small. broadly subovate, the anterior part of the 

 outline siMiiifirfular. the posterior -lightly prolonged and more narrowly rounded 

 centr.ilh ; apex pointeil. not quite erect, leaning slightly for wan 1 and situated a abort 

 di-taiice iii front of the center. Surface marked with obscure, fine, concentric lines 

 and usually with seven 1 strung wrinkles or undulations of growth. The latter are 

 more or less variable and irregular, and in some cases may ! wanting. On caste 

 of the interior they are very faint or .piit- indistinguishable. Muscular scars not 

 well preserved 1>y any of the specimens seen, apparently detached and forming 

 an oval band about the apical tliird of the Cast. length (-mall -pecimen) 12 mm.: 

 width 10.7 mm.; bight 4."i mm. In a larger specimen these dimensions are 

 respectively !*>.*). 14 and "> mm. 



The absence of radial surface markings will distinguish thi- -p.-.-ies from the 

 following forms of Scenella, and the subcentnil pMtion of the apex renders equally 

 good service in separating it from the preceding species of Archinacella. As to 

 /''//-/ it is certainly distini t from all other forms known to belong to the genus. 



Formation and locality. Ston<-s Hiv.-r group. V.unix. -1111:1 U-.I, Minin-:i|Milis: Illack River gr'iip 

 CteoodooU bed, ml several localities In G<"lhu.- roimiy. MlnoeauU. 



CWItdioM. GokiaU and Natural II -oU; E. O. Ulrlch. 



Mtueum Remitter, No. 6104. 



NKI.I.A. Hillings. 

 Setnttta. ISM : loss., vol. li, |. :: 



t generic characters see page S 



This genus has never been properly defined and it is perhaps impoible to do SO 

 even to-day. Still, we are convinced that, with >'. retimlutu Millings as the type, it 

 may be made to include an easily rr ':< and thoroughly natural group of 



patelloid shells having relations to /' on the one -ide, and to Strimtlieca on 



the other. As understood by us the v liaractei i/ed l>y the -ul. central ajex 



and the radial stri.f. The latter vary in strength, being sometime, rather 

 but in most CMOS very fine. When the radii are d they -how 



