Mr. Herbert Goss — A Silurian Cochroach and two Scorpions. 129 



Eock and Oxford Clay into the Lower Corallian Limestones. The 

 larger specimens have a considerable resemblance to Fl. Milnsteri 

 from the " Lower Coral Rag " of Heersum, which is on the horizon 

 of the Wydale Beds. In Fl. Milnsteri the spiral angle is wider, the 

 whorls more angular, and the ornamentation probably more 

 "reticulate" (mainly a question of status). The closest repre- 

 sentatives of PI. Milnsteri occur in the Main Limestones of Osmington. 

 But in the Elsworth rock, which is Upper Oxfordian, are specimens 

 of Pleurotomaria the very fac-simile of the larger specimens from 

 the Scarborough Cornbrash. These Elsworth rock specimens were 

 identified by Blake and Hudleston (Corallian Rocks of England, 

 Q.J.G.S. 1877, p. 313) with Roemer's Heersuraer species. 



The specimen from the Lower Corallian Limestones of Wydale is 

 in excellent preservation, and may be compared even with such an 

 one as is figured (Plate III. Fig. 8). Although a smaller fossil, 

 the granulations are slightly larger, and in this respect it more nearly 

 approaches PL grannlata, Sow. I doubt not that each horizon and 

 locality will present some slight dififerences, but the broad fact 

 remains that one of the most abundant fossils in the Yorkshire 

 Cornbrash may be traced sparingly through all the Oxfordian beds 

 of Yorkshire, including the Lower Corallian Limestone, whilst its 

 nearest relatives, and in some cases absolute representatives, are 

 characteristic Oxfordian fossils in other places. 



explanatiojS" of plate III. 



Fig. 1, la, lb. Trockus monilitectus, Phillips. Scarborough Limestone. British 



Museum. Back, front, and basal views, x 1|. 

 ,, 2, 2a. Trochns Scarburgensis, sp.n. Cornbrash, Scarborough. Leckenby 



Collection. Back and front views, x 1|. 

 ,, 3, Sff. Trocliiis striffosus, Lyeett. Cornbrash, Scarborough. Leckenby 



Collection. Type refigured. Back and front views : nat. size. 

 ,, 4. lb. Same formation, locality, and Collection. Back view; nat. size. 



,, 5. Trochiis .^ «Se«r52w^wsi.s', var. Cornbrash or Kelloway Rock. British 



Museum. Back view ; nat size. 

 ,, 6, 6«. Trochiis subglaber, sp n. Cornbrash, Scarborough. Leckenby 



Collection Back view, x 1|, and whorl further enlarged. 

 ,, 7. Trochiis Leckenby i, Morris and 1-ycett. Scarborough Limestone, 



? Claughton. Leckenby Collection. Type rbpigueed. Back 



view. X I5. 

 ,, 8, 8ff, 85. Pleurotomaria fframilaia, hycettj-aon Sowevhy. Cornbrash, Scar- 

 borough. Leckenby Collection. Back and front views ; nat. 



size, and portion magnified. 

 ,, 9. lb. Kelloway Eock, Scarborough. Leckenby Collection. Back 



view ; nat. size. 

 ,, 10. lb. Oxford Clay, Scarborough. York Museum. Back view; 



nat. size. 



IV. — On the Recent Discovery of the Wing of a Cockroach 



AND two Scorpions in Rocks of Silurian Age. 



By Herbert Goss, F.L.S., F.G.S., etc. 



TTP to December last the most ancient fossil insects known were 



U the six fragments of Neiiroptera, obtained by Mr. C. F. Hartt, 



from the Devonian rocks of New Brunswick, which were described 



by Mr. Scudder in Vol. V. of this Magazine.' Although these six 



1868, pp. 172-177, and 216-222. 



decade III. VOL. II. — NO. III. 9 



