N0.122-.). CAMUniAX lUiACllKH'oDA—WALCOTT. (Yd(y 



having- been collected, although the l)eds in which it occurs were very 

 thoroughlv searched during the survey of the Eurei<a mine district. 



Fnrniatton, and /ocaliti/.—\J\:)\:)ev portion oi" the ^Middle ( ainl)riaii 

 sliidy limestone in Secret Can3'on shale, Secret Canyon, Kui-cka Dis- 

 trict, Nevada. 



CAMBRIAN BRACHIOPODS OF SARDINIA. 



Dr. J. G. Borncmaiui has illustrated several species of hrachiopods 

 that occur in association with C'anil)rian types of trilobites. \lo iden- 

 tities, most of tluMu with well-known Ordovician species of Kiiropc*. 

 The most abundant is a species that is identified as LlmjuJa (i/lriH«if<i of 

 Sower1)v, Avhich occurs in the middle and upper portions of the Ordo- 

 vician fauna. It rcM-alls by its form such American Cambrian species 

 as (JhohiH {L(/i(/u/ejM.s) (icnruindtus and Oholx.^ {LtiujiilrUjt) (icntaivnilm. 

 It resembles L!n<jtihi uttenuatu in outline, but it is highly improbable 

 that a species of this character should exist from Middle (luubrian 

 time to ^Middle Ordovician tinu>. The same is true of two other spe- 

 (^■iey — one doubtfully identified as Lhujnhi rouauUi Salter; another as 

 L'nKjnhi pctaloii 1 licks. 



The shell named LuKjuhi Jidirhr! Koualt i is too imperfect for either 

 generic or specilic identification. In size and form it suggests Mick- 

 witzia. Another form, oholella f sp., is probably the same as the 

 shells referred to Lhigula jh-falon. The study of specimens received 

 from Dr. l^ornemann, and the figures given by him as Oholella crassa 

 llall, lead to the conclusion that the reference to the genus and spe- 

 cies is incorrect. The identification of Kntrmj/na clugulata Billings 

 appears to be correct as to genus, but probably not so as to species. 



The bfachiopod fauna of the Cambrian of Sardinia, as described in 



this memoir, is as follows: 



Obolus {Lingulella) hornemauni Walcott. 

 Obolus (.«') meneghini Walcott. 

 Obolus {?) zuppi f Walcott. 

 Katorijina sardinlensis Walcott. 

 MickwUzid ? Hp. ? 



