44 



iis the sIh-U is known to W. vnr'uMv, and iw tlif fi>««il .T:i|i:in«>««c K|M><-ini(tis «!o not 

 go ln-yon«! tlu- limit» jK>iiit4'tl out liy (liv iiltovt- tncntionol nnthors, citlMT in tln-ir 

 foini or in tlicir si/,(\ 



Liichui Ixirenlii Linn«-. I'l. \'l,f. 24. 



iSpt. n:it. 1(1. 7:i, i>. 11S4, II.X VcnuH.— I'orU* :ui:l Il!ini.-y, hrit. Moll. 

 vol. 11, J). 4C>^ pi. 3"), f .').— Ji'fl'n-ys. luit. Clomli. vol. II, \t. '242.—\lwviHti, 

 Foss. Moil, (k-s Wii-n.r P.vki-ns, vol. II. p. 2'J'J, pi. M, f. 4.-\Vo<xl. (.'nix 

 Moll. II. p. i:W, pi. 12, f. l.-Wcinkan(r.>c('onoii .1. Mitfi-lni vol. 1, p 

 1(12). 



The most niiiintc exiimination of lonn, outline, int^Tiial uiul oxti-mal Heul|>- 

 tun- anil liing(! hiw not ix^vmle«! tlio slijjlitcst tliflea-nue btrtwwn a Lucinii, found 

 viTV oftt?). tlion<;h mostly in sm:i]l H|Kvin»cns at Oji, ami tlif foKsil .-iihI ny-cnt 

 KuroiKim l.ncina borealis. The slronj; '.onit-ntrii-al htria', tlir iK<«'p Imiula, tlie 

 Hat, c-ircnlar slia|K', tlicBÜglit internal riil<^e Ik'Tur' tliu iMiKtiTior muNcnlar imprufwion 

 (almost, tliougli not ipiito i>onsbuit), tlic oblique tx'ntriil furrow of tin; insi«!^:— 

 all these, .iml in fa't, all tlie other rhar.u tei-s |>('rfeo»ly aj^rc«-. 



The lar;.;eiJt sjieiimens of Oji are 2.') mm. in iin;;th nml 'I'.i nun. in height. 



iJiplntlniiia tiifjouuln Uroiin. I'l. \'I, f. 2"). 



(llal. Tert. Geh. p. 9«, pi. 3. f. 2 -I'hilippi, Ennm. Moll. 8ie. vol. II. p 

 24.— HfK;rnes. Fo.*8. Moll. ,Uv Wiener IVkens, vol. II, p 218, pl. 32, f. 4.— 

 Weinkanfl" Conch.des MittelniexTi-s, vol. I, p. l.l.S.— Syn. Ü. apii-nlis Phi! , I. 

 c. vol.1, p. 3l,p!. 4, f.C», anil vol 2, p. 24, yonn;;er form. Syn. als<i H. if^tartea 

 Nyst, C'o<in. fo«!. In-lg. p. 121, pl. (i, f. 4. and \Vo:>il, Cnig Mollnsci» II, p. 

 14f.. pl.82,r2.). 



The ohlitinen(s.s tlie triangnlir fonn v.ith olili(jneIy tles.fmlinj; hin<^'- 

 niarjijin, ami with ]H,st4-rior elonj^ation. tof;other with the simple eonix-ntrie.il line« 

 ami folils of the surfatv, prove the identity of the alwvo-quoted s|(eti«* ami of one 

 of the shells fonml fii-qui ntly in the layer of Oji. The hin^e e.vhihit.o some ditVer- 

 en«j from D. orliella CionM (Oti.i C'on:h. p. 212, Lis.hke, v. 2, \>. \:V.\) as then- 

 is a i><>iterior hvteral tooth, though s«)me\vhat indistinct (e.xcept at the end of tiie 

 are.i, where it lieconits more distinctly visihlet; hut this «iMi-ii-s in still inoru 

 d(H-ide<lly e.xeludi'«! hy its ctpiilatemi, ronndinl and glolm«? form. Our K|i(vin)en.s 

 re.U'h 20 mm. in h nglh, 2.'» in height an 1 12 in thiikncss. The undKmi s are at 

 A to I of the length from the anterior end. 



Airn iuf.iitn Ileeve. 



(Coneh. Iron. Area, pl. f), f. 3(), Lisehke. .Tapm Meen*-(-oneh. vol. I. p. 

 14fi, and vol. II. p. 144. Morso, shell-nionnd of Omori, p. 2fi. pl. !H, f. 

 T).— Syn. II. I>ron<^litoni Selueni-k, Moll. d<s Amerlandes u. des Noid- lap. 

 M.vres. p. .OT.S, pl. 24, f. 1-.3.». 



Thin rhell is found fri^piently at Oji, (K) \\m\ in length, 74 in height and 

 CO in thiekiies«, with :VS to 45 ril»«. TIk" jiosterior juirl is a little nnirower, the 



