Mr. H. Seeley on Cambridge Geology. 97 



will indicate the chief distinctions from the previously known 

 species. 



M. Hagenbachii. 



M. capite postiee in collum longissimum subcylindricum attenuate ; 

 prothorace elongato-hexagono, aiigulis anticis porrectis conicis ; 

 lateribus spinis tribus seque distantibus armatis (spatio inter spinam 

 posticam et basin fere dimidium prothoracis sequante) ; elytris 

 foliaceo-dilatatis, angulo basali in lobum transversurn antice trun- 

 catum porrecto, dilatatione magis cordiformi, latitudine maxima 

 ante medium posita ; antennarum articulo secundo longitudine 

 latitudinem ejus duplo superante ; scutelli apice rotundato. 



Long. Corp. unc. 2^, ad apicem elytrorum unc. 3^; capitis lin. 9; 

 prothoracis lin. 7i ; elytrorum ad apicem suturse lin. 14 ; lat. 

 elytrorum ante medium lin. 1 7. 



Habitat M^dldi^ccBim in insula Sumatra. 



The fact of this species being found in the same locality with 

 M. phyllodes forbids our regarding it as a geographical variety ; 

 whilst the specific characters given above equally militate against 

 its being a local modification_, such, for instance, as occurs in 

 many species of Carabi or Harpalidce, respecting which so much 

 discussion has recently taken place amongst Continental ento- 

 mologists. 



The specific name given above was suggested by Mr. Adam 

 White, in honour of the original founder of the genus. 



XII. — Notes on Cambridge Geology. 

 By Harry Seeley, F.G.S., Woodwardian Museum. 



I. Preliminary Notice of the Elsworth Rock and associated 

 Strata"^, 



One of the last labours in England of Mr. Lucas Barrett was 

 the production of a geological map of the country around Cam- 

 bridge, Of the Lower Secondary deposits, he therein coloured 

 the Kimmeridge Clay, Upper Calcareous Grit, and Oxford Clay. 

 The chief novelty in this was the introduction of the Calcareous 

 Grit; for Professor Sedgwick, many years before, when riding 

 in the neighbourhood of Conington, had somewhere seen a 

 drab-coloured deposit, which, without dismounting, he very na- 



* Communicated by the Author, having been read at the Meeting of the 

 British Association at Manchester, Sept. 186L This paper was to have 

 been incorporated with one on the Strata of England between the Portland 

 and Great Oohtes, an intention reluctantly postponed. It will be followed 

 by four papers which were to have been other chapters in the scheme : — 

 r. On the Kimmeridge Clay; 2. On the Tetworth Clay and Coral Rag; 

 3. On the Rocks of the Oxford Clay; and 4. On the Oxford Clay. 



Ann. S^ Mag. N Hist. Ser. 3. Vol.x, 8 



