74 



other fonn8 descrilxHl by Lischke ami otlier uutlu'i-s— nnist l«, ini«tly nt Imst. 

 united witli tlie true M. ednlis L., \vli>*c variability is iiuleeil almost iiniversnlly 

 nckiio\vlf.l'^'c(l. The K\nie is tlic cnso willi the Hheils and moulds from tho 

 Ilidachi sandstones, whose number, however, is but small. 



Mndiola fiaMlata Gould. 



(Otia conchol. p. i)3. Atl.u» of Mollusca of Wilke's Exiwd. yl -V), f. 5G1.) 



This Oregon species is doubtlessly represented by a few of the moulds of 

 the Sukegawa siiidstones. 



TerebrtttuUna caput-scrprntia L. 

 (Syst. nat. lathed, p. 11 "j.l, as A nomia ; excl.syn.— lb. \^. llßLa« Anomia 

 rctusji— Lamarck , hist. nat. &i- 2d ed. v. 7. p. 332, as Ten-brat ula cipnt- 

 BcriMjntis.— Forlics and Hanley, brit. Moll, v 1, p. .3;')3, pi. .'><), f. 1—4, 

 also as Terebratula. Reeve.— Conch. Icon. pi. 4, f. 19; «Irwin Monoj^. of 

 Ttjcent Brachiopoda— Jeffreys, brit. Conch; v. 6, p. C9, us Terebratula — 

 Sowerby, Min. Conchol. v. R, p. C9, us Terebratula ftriatnla -riiiHi i i. 

 Knum. .Moll. Sicil. v. 1, p. 0Ü and v. 2. p. Gfi; do — WeinkaulV, C i.. n. 

 d. Jlittel-meeres v. 1, ]>. 28.').— Adams, Aim. Hag. Nat. lliht. .3d »erie«, v. 

 II, p. GS, with varieties T. japonica and T. Cumingii.— Davilson, Pro-. 

 Zool. Soo. 1871, p. 303, i)l. 30, f. 7, 8 and 9). 



Though the outline and size— ..s this i.s iiflcii the case witli li: 

 especblly with Tcrebratulina}— are somewhat ditVen-nt from the tyj'' 

 those of Hidachi rciching 34 millimeters in height and 32 in length, yet the 

 characters, for instance the sculpture, agree so i)erfectly that they cmnot be 

 referred to different siie^^:ie8. Even as a variety this fossil fonu cannot Iw separate»! 

 from the recent Japanese specimens, since the latter, from HakiMlate, have tho 

 same— and in some instances a little larger— size and e.vactly the sjime projior- 

 tions.— The specimen mentionol above from Chichibu is much smaller. 



RhynchoucUa jtsUtacea (Imelin. 



(Syst. nat. Linn. LUli ed., 3318. as Anomia.— I..amarck, Hist. nat. etc. v. 



G, Istdiv., J). 248.— Davidson, Troc Zool. Sue. London, 1.S71, p. 3^'JO, pi. 



3],f. 12.— Adams, Ann. Mag. Nat. Hist. 3<l scries, v. 11, p. 100. established 



a variety as Rh. Wood ward i. I 



Specimens corresponding ]K'rfectly t<> thedeteription and ligurc ot I'avidson, 



but reaching 30 millim. in height add .34 in length— in oneca.v' even 3G— , Imvo 



been found exclusively in the isolated l>asin west of Sukegawa. They were 



associated with tho foregoing 8i>ecies, which occurred also abundantly and alnw»t 



exclusively at this place. 



The sandstone and marly ci.nglomenitc filling the valley encircle«! l»y crystal- 

 line rocks, and ovcrljnng unconfonnably mica-schist, calcarcoiiH mica-schist, 

 cipolliue and other crj^tallino limestone«, might be indeal called the 'Sukcgawa 



