ORDOVIOTAN AND SILURIAN BRACHIOPODA OF THE GIRVAN DISTRICT. 963 



(1) Protorhyncha sp. 

 (1), (2), (3) Rhynchotrema Lapworthi (Day.). 



(1) Rhynclwtreta ardmillanensis (Dav., MS.) var. 



(1) Zygospira orbis, sp. nov. 



(1) Protozyga earrickensis, sp. nov. 



Balclatchie Group. 



(1), (2), (3), (4) Obolus audax, sp. nov. 



(1) Micromitra (Pater ina) Davidsoni, sp. nov. 

 (1) Rhinobolusl balclatchiensis, sp. nov. 

 (1), (2), (3), (4) Paterula balclatchiensis, Dav. 

 (1), (2), (3), (4) Lingula amabilis, sp. nov. 



(1), (2), (3) ,, brevis, Portl., var. angustior. 

 (1), (3) ,, pseudoquadrata, sp. nov. 

 (1) Lingulasmal ardmillanense, sp. nov. 

 (1) ,, ? canadense (Billings). 



(1) ,, 1 pulcherrimum, sp. nov. 



(1) ,, ? quxstor, sp. nov. 



(1), (2), (3), (4) Acrothele medioradiata, sp. nov. 

 (1) „ ?sp. (a). 

 (1), (2) „ ?sp.(6). 

 (1) Acrotreta 1 sp. (a). 

 (1), (2) Conotreta conoidea, sp. nov. 

 (1), (3) Siphonotreta micula, M'Coy. 

 (1) Trematis melliflua, sp. nov. 

 (1) Orbiculoidea sp. 

 (1) Philhedra Playfairi, sp. nov. 

 (1) Pseudocrania, aff. depressa (Eichw.). 

 (1) Orthis Playfairi, sp. nov. 

 (1), (2) „ (Plectorthis) ardmillanensis, sp. nov. 

 (1) ,, ( ,, ) duftonensis, Reed, var. 

 (1) ,, ( ,, ) subplicatella, sp. nov. 



(1) ,, (Dinorthis) flabellulum (Sow.), var. nov. earrickensis. 

 (1), (2), (5) ,, (Hebertella) balclatchiensis, Dav. 

 (1), (5) ,, ( „ ) bellatrix, sp. nov. 

 (1)" ,, ( „ ) Lapworthi, Dav. 

 (1) „ ( „ ) scotica, M'Coy ? 

 (1) ,, (Platystrophia) biforata (Schloth.). 

 (1), (2?), (3) ,, (Dalmanella) federata, sp. nov. var. 

 (1) ,, ( ,, ) girvanensis, Dav. 



(1) ,, ( ,, *?) Rankini, Dav. 



(1), (2) ,, ( „ ) testudinaria (Dalm.), var. nov. gracilis. 



(1) Rafinesquina concentrica (Portl.). 

 (1), (2), (5) ,, (Playfairia) deltoidea (Conr.). 



(1) ,, ( ,, ) ,, var. nov. multicorrugata. 



(1) „ ( ,, ) ,, var. nov. tenuicorrugala. 



(1), (21), (3), (5) „ ( „ ) semiglobosina (Dav.). 



(1) ,, 1 brumalis, sp. nov. 



(1), (2), (3), (4), (5) ,, ? subaraclinoidea, sp. nov. 



(1) Leptxna rhomboidalis (Wilek.), var. a. 

 (1) Leptella Grayx (Dav.). 

 (1) Leptella 1 pseudoretroflexa, sp. nov. 

 TRANS. ROY. SOC. EDIN., VOL. LI, PART IV (NO. 26). 137 



