250 F. R. Cowper Reed — On the Genus Conocoryphe. 



It was partly from observations such as these that I was led to 

 suggest a derivative origin for the calcareous substance of the corn- 

 stones of the Old Red Sandstone, and for much of the limestone of 

 the Lower Lias ; nor has subsequent reflection led me to abandon 

 this explanation, but rather to extend it. A good deal of the 

 magnesian limestone of the North of England is as false-bedded as 

 a modern beach sand, and occurs under circumstances that would lead 

 us to look for its source rather in the mountain limestone than in its 

 poverty-stricken indigenous fauna. Such derivative calcareous matter 

 would by reason of its finely divided state be in a condition to yield 

 readily to the action of magnesian waters and thus pass into dolomite. 



It by no means follows that rivers have been the only agents by 

 which mechanical calcareous deposits have been formed from pre- 

 existent limestones ; sea waves may have also played their part, as, 

 indeed, is suggested by my friend Mi\ Woodward, who also has 

 arrived at the conclusion " that under certain conditions there may 

 be sedimentary deposits of calcareous mud [derivative] as well as 

 chemical precipitates." 



IV. — WooDWAEDiAN Museum Notes : On the British Species 

 or THE Genus Conocoryphe. 



By F. E. Cowper Eeed, M.A., F.G.S. 



IN 1877 Dr. Woodward ^ recorded nineteen British species of the 

 genus Conocoryphe, of which seven were doubtful. The 

 following is the list of them : — 



Conocoryphe aldita, Salter. C. Lijellii, Hicts. 



G. applanata, Salter. C. ? olenoides, Salter. 



0. ? bucephala, Belt. C. ? simplex, Salter. 



C. biifo. Hicks. C. solvensis. Hicks. 



C. coronata, Barrande. C. sp., Salter. 



C. {Solenojjlcura) depressa, Salter. C. ? variolaris, Salter. 



C. Homfrayi, Salter. C. ? rerisimilis, Salter. 



C. humerosa, Salter. G. vexata, Salter. 



C. inrita, Salter. G. ? WiUiamsoni, Belt. 

 C. ? longispina, Belt. 



Professor Etheridge - in 1888 gave the following four additional 

 species : — 



Gonocoryphe Malvernius, Phillips. C. perd'Ua, Hicks. 



G. monile, Salter. C. Plantii, Salter. 



Salter 3 in 1872 had doubtfully recorded C. ? ecorne (Angelin) ? from 

 Wales. The latest addition to the list was C. viola (H. Woodward) 

 in 1888 from Bethesda.^ 



Since the generic name Conocoryphe is now used in a much more 

 restricted manner than formerly, it is desirable that the true position 

 of the above-mentioned species should be determined afresh. The 

 genus Conocoryphe is now used= as the type of the family 



1 Catal. Brit. Fogs. Crust., pp. 31-33. 



2 Brit. Pal. Foss., pp. 48, 49, and 406. 



3 Catal. Canib. Sil. Foss. Woodw. Mus., p. 12. 



* H. Woodward, Q.J.G.S., vol. xliv (1888), p. 74, pi. iv. 



5 Textbook of Palajontology, by Zittel & Eastman (1900), vol. i, p. 626. 



