968 DR F. R. C. REED ON THE 



(1) B. Atrypa reticularis, Linn. 



(1) B. Dayia sp. 



(1) B. Spirifer plicatellus, var. radiata, Sow. 



(1) B. Cyrtia exporrecta, Wahl. 



(1) Rhynchospira (Homveospira) camreganensis, sp. nov. 

 (1) B. Nucleospira pisum (Sow.)? 

 (1), (3) Coelospira hemispherica (Sow.). 



Penkill Group. 



(1) Lingula Symondsi, Salt. 

 (1), (2) Lingulasmal tenax, sp. nov.? 



(1) Philhedral penkillensis, sp. nov. 



(1) Pholidops implicata (Sow.). 

 (1), (2) Orthis (Dalmanella) crassa, Lindstr. % 



(1) „ ( „ ) elegantula, Daim. 



(1) „ ( „ ) cf. visbyensis, Lindstr. 

 (1), (2) ,, (Rhipidomella) polygramma, Sow., var. pentlandica, Dav. 



(1) „ (Plectorthis) rustica, var. walsalliensis, Dav. 

 (1), (4) Leptxna rhomboidalis (Wilck)., var. £. 

 (1), (4) Stropheodonta (Brachyprion) Walmstedti (Lindstr.). 

 (1), (2) Strophonella penkillensis, sp. nov. 

 (1), (4) Pledambonites transversalis, var. nov. penkillensis. 

 (1), (2), (4 1) Schuchertella applanata (Salt.). 



(4) Triplecia insularis, Eichw. 1 

 (1), (2), (4) Mimulusl incertus (Dav.). 

 (1), (4) Pentamerus oblongus, Sow. 



(1), (4) ,, (Barrandella) undatus, Sow., var. nov. penkillensis. 



(1), (4) Parastrophia rotunda (Sow.). 

 (1), (2) Glassia obovata (Sow.). 

 (1), (4) Atrypa reticularis, Linn. 



(1) Spirifer plicatellus, var. radiatus, Sow. 



(1) Cyrtia exporrecta, Wahl. 



(2) Nucleospira pisum, Sow. % 



(1) Coelospira hemispherica (Sow.). 



Composition of the Fauna. 



In the foregoing pages over 230 species or varieties have been described as 

 occurring in the Ordovician and Silurian rocks of the Girvan area. Amongst these 

 there are over 70 named species new to science and a large number of named varieties 

 as well as several shells whose specific individuality or relations are not determinable. 

 Most of the others have been previously found in different parts of the British Isles, 

 though some have not hitherto been recorded from Girvan. Davidson's # list of 

 Girvan brachipods showed only 121 species, but in many cases he included under 

 one specific name several different forms which have now been separated off. 



The distribution of the brachiopods on the various stratigraphical horizons shows 

 some interesting features, the abundance in the Stinchar Limestone and Balclatchie 

 Groups being in strong contrast to the poverty in the Camregan and Penkill Groups. 



* Davidson, op. cit., vol. v, Sihtr. Suppl., pp. 224-227. 



