ORDOVICIAN BRACHIOPODA 9 



II. FAUNAL DISTRIBUTION 



The brachiopods collected from the Ordovician rocks of the Shelve district have 

 been assigned to the 85 identifiable taxa described in the systematic section, with 

 19 species classified as Inarticulata, 41 as Orthida, 5 as Triplesiida, 15 as Stro- 

 phomenida, 3 as Pentamerida and 1 each as Rhynchonellida and Spiriferida. The 

 taxa are unevenly distributed in the succession with : 



19 species recorded from 36 localities of Mytton Flags (A), 



7 ,, ,, ,, 18 ,, „ Hope Shales (B), 



8 ,, ,, ,,12 ,, ,, Stapeley Volcanic Group (C), 

 5 ,, ,, ,, 16 ,, ,, Weston Beds (D), 



8 ,, „ ,, 23 „ ,, Betton Beds (E), 



17 ,, ,, ,, 41 ,, ,, Meadowtown Beds (F), 



16 ,, ,, ,,52 ,, ,, Rorrington Beds (G), 



21 „ „ „ 8 „ „ Spy Wood Grit (H), 



14 „ ,, ,, 8 ,, ,, Aldress Shales (I), 



15 „ „ „ 4 „ „ Hagley Shales (J), 

 and 23 ,, ,, ,, 4 „ ,, Whittery Shales (K). 



In the following comprehensive list of stratigraphic distribution, the lower case 

 letters Y (rare), 'fc' (fairly common), 'c' (common), and 'vc' (very common) 

 respectively represent the retrieval of one or more specimens of a listed species in 

 0-25%, 26-50%, 51-75%, 76-100% of all localities for any one formation, while the 

 capital letters 'A', 'B', 'C etc. at the head of the list are keys to formations in the 

 order given above. The list is : 



ABCDEFGHI JK 



Apsotreta sp. r __________ 



Astraborthis uniplicata gen. et sp. nov. r — — — — — — — — — — 



Bicuspina modesta sp. nov. ______ rc ___ 



Bicuspina subquadrata sp. nov. — — — — — — — — rfcvc 



Bystromena perplexa gen. et sp. nov. _______ vc __ _ 



Caeroplecia plicata gen. et sp. nov. _________ rvc 



Conotreta stapeleyensis sp. nov. — r r — ______ _ 



Dalmanella elementaria sp. nov. r __________ 



Dalmanella salopiensis sp. nov. --- — rcr — - — — 

 Dalmanella salopiensis gregaria sp. et 



subsp. nov. _______ vc __ 



Dalmanella salopiensis transversa sp. et 



subsp. nov. ________ f c __ 



Desmorthis ? sp. nov. r — r — — — — — — — — 



Diplarelasma sp. r __________ 



Dolerorthis cf . tenuicostata Williams __________ r 



Drabovia cf . fascicostata Havlidek _______ f c ___ 



Eocramatia dissimulata gen. et sp. nov. _ r _________ 



Euorthisina cf . moesta minor Havlicek r __________ 



Furcitella sp. __________ r 



Gelidorthis cf. partita (Barrande) ______ r ____ 



