258 NOTES ON THE I'ERMIAN SYSTEM 0I«' 



2. S. MULTIPLICATA, Soit\ 



It is very much rounded in its general outline, and the plaits 

 are less numerous and more rounded than in the foregoing species. 

 The shell-punctures are very much smaller, so as not to he visible 

 to the naked eye or impressed on casts. The T. Jonesiana, King, 

 is only a more rounded form of this shell, occurring commonly at 

 Dalton. 



It occurs rather plentifully in the shell-limestone of several 

 localities. 



n. STmi¥Ell,So7verhj. 



1. S. ALATUS, Schloth. 



I regret that t cannot assent to the division of this fine cha- 

 racteristic shell into three species, as proposed by Mr King in 

 the " Permian Monograph." The specimens figured in that 

 work, pi. 10, are all referable to the above, and in the text no 

 character has been pointed out of specific or even varietal value. 



It is not very abundant in any locality, but may be met with 

 most frequently at Humbleton in the shell -limestone. It occurs 

 also in the compact-limestone and in the magnesian-conglomerate 

 at Tynemouth. 



12. TEREBRATULA, Llkivyd. 

 1. T. ELONGATA, Sclllotll. 



I agree fully with Dr Geinitz, who has referred all the forms, 

 including T. sufflata, occurring in the magnesian limestone, back 

 to this species; and I deeply regret that the author of the 

 " Permian Monograph " has again attempted to raise the T, 

 sufflata to the rank of a species, for surely nothing can be so 

 injurious to the true progress of science as the burdening of it 

 with false species and useless synonyms. 



This species is very abundant in several localities in the shell- 

 limestone, of which it is very characteristic. It occurs at Tyne- 

 mouth, in the magnesian-conglomerate. 



