CU^, ..ulcL^mfc,^,., 



tour.* IMlMl.M.Kl 



lOtHiM. Klir, CMMMpi, Ifaafe MM 



tomy.t. I -Iri.-h: 



I U.K. Hall. 



,-,imj,,,. Hall ami Whltfl.-M: <;m M my.i.i. I . '.-/..win McCoy fi 



SphMwtlM, Mlll.-r; Sr>, ti.-li. 



\irriD.i-: 



AslarMla, Hall. 



i Mi:<..\l.'MM,.vril> 

 GKNKKA: ilegalodo*. Mfyalom,*, Flail: - /'/^/,, --,./,, 



Fwulljr LUCIMD.K. Khmyo*. 

 <iyeAu, Hall. % 



Family CYCU H '( N( 'IIID.K. (ProrWooal). 

 NKRA : Cjrf/oconf*a, Miller; ? Mnod.mro/w- '... 



Family CONOCARDII D.K. Mill-r. 



OKN-KKA : OimoeanKum, Brown: ? Koptrriit. Hilling: Kel,umn, Blllin,^. 



Family CARDIOMORPHID.K. Mill.-r. 

 OENKRA: Cardiomorphn, Konlnrk: Brimondia, Koninc-k: Kiithyt'tma, Hall; Protomya, Hall. 



Family SOLENID/K, Adam*. 

 OKMUS: Solmaptit, McOty; 1'alaotohn, Hall; Orlhoncta, Cuorad. 



Family PAL^EANATINID.K. Mill.-r. 

 OENKHA //I..MI.I. Uillifu.-: /'.- II ill; Prorhynfkuf, Hall. 



,;!> IMMTHYIJID.K. Hall. 

 us: Prothfrif. M----k. 



The litcratun- p.-rtaining to Iy>wer Silurian Lamellilmincliiuta is not only 

 meager luit. in great part, unrelialde. The principal cause for the latter is to be 

 found in the want of experience of the authors, who, failing to understand the effect* 

 of pressure to which a large proportion .if the shells have been subjected, have thrown 

 together as identical widely different forms, and oft. -nor. perhaps, distinguished the 

 nens from those which have more nearly retained the normal form. 

 The illustrations also are too often, if not entirely worthless, misleading. Here, more 

 than in any other part of the study, the greatest care and exp.Ti.-nce are required. 

 Kntire and undistorted pecinn-ns are not by any mean- the rule, so that -li. 



