148 



SUPPLEMENT TO THE 



genus with which we are at present acquainted, but it is highly probable that when 

 better understood the number of so-called species will have to be reduced. 



* The species so marked have been found in Scotland. 



►2 



1 



1 



1 



1 



i 

 6 



5 



*Ilhynchonella micula, Sow 



X 

 X 

 X 



X 

 X 



... 



... 



... 



X 

 X 

 X 



X 



X 



X 

 X 



X 



X 

 X 



X 

 X 



X 



X 



X 



? 



X 

 X 



X 

 X 



7 



X 

 X 

 X 



7 

 X 



? 



X 

 X 



X 

 X 



X 

 X 



? 



X 

 X 



? 



X 



X 

 X 

 X 



X 

 X 



X 



X 



X 

 X 



* — Wilsoni, Sow 



var. Davidsoni, M^Coy 





* — borealis, <ScAZ 



* — sub-borealis, _Da?> 



— decemplicata, iSow 





— Lewisii, jDaz; 



* — Weaveri, 5'ff/to- 





* — cuneata, JQ«/ 



* — Thomsoni, Dar 



— Dayi, Daw 



* _ ■lVmi\&xiA\e^,Hasivell 



* — Salteri,D«i» 





* — iiasuta, irCoy . . 



— Beltiana, J)av 







— nana Salter .... 



— diodonta, Dal, .. .... 





* — Balcletchiensis, Z)aD 





— Callawayana, Dav . 



— Glassii, Dav. = At?\ depressa, Sow 









* — Jackii, Dav ... 



* — Maccoyana, Daw 



— Stricklandii, Sow, 





32. Rhynchonella borealis, Sc/ilot/t., sp. Dav., Sil. Mon., PI. XXI, figs. 14 — 27; 



Sil. Sup., PL X, figs. 25, 25«. 



The careful and prolonged hand-pickings from the detritus of the old Wenlock 

 Limestone Quarries of Benthall Edge, Lincoln Hill, and Wenlock, as well as the extensive 

 Wenlock Clay washings carried out by Mr. G. Maw in Shropshire, have brought to hand 

 a very large number of specimens of B. borealis, showing all its modifications in shape 

 and stages of growth. These have enabled me to ascertain beyond doubt that its young 



