EXPLANATION OF THE PLATES AND WOOD-CUTS. 



Fig. 8. Part of the pelvis of a crinoidal animal. 



Occurs in a hard, flinty, slate rock, traversed by veins of Quartz at Looe. 



Plate LVL 



Fig. \. Corbula Hennahii. Transversely elongate-ovate, with a slightly projecting 

 ' beak, smooth, convex, valves somewhat unequal; posterior side obliquely trun- 

 cated, anterior pointed ; twice as wide as long. 



There appears no likelihood to us of this shell being referrible to the genus 

 Lembulus, to which it was assigned by Dr. Leach ; its unequal valves, if this be 

 not accidental, indicate its affinity to Corbula. 

 Loc. Mount Wise. 

 Fig. 2. Cardium aliforme, var. (M. C. t. 552. f. 2. Goldf Petr. 213. Tab. CXLIL f. 1. 

 Pleurorhynchus minax and aliforme of Phillips, Geol. of Yorks. 210. PI. V. f. 21. 

 Bucardites hijstericus, Schloth. Nachtrage. t. XX. f. 1.) One of the many varieties 

 of C. aliforme. Goldfuss has done well in keeping them all together. We can 

 see no reason for separating them into distinct species, or for adopting a new 

 generic name. 



Loc. Stonehouse Hill. 

 Fig. o. Leptcena analoga. (Phill. loc. cit. PI. VIL f. 10. Producta anomala, Sowerby. 

 See Encyc. Metrop. loc. cit.) The worn specimen before us we presume to belong 

 to this species. We have seen a most beautiful internal cast from Barnstaple in 

 the collection of the Rev. D. Williams. 

 Loc. Plymouth, Barnstaple. 

 Fig. 4. Leptcena rugosa, His. ? (Dalm. Act. Holm. 1827, 106. Tab. L f. 1.) We refer 

 this shell with uncertainty to Dalman's species, of which we have not seen well- 

 authenticated specimens ; its more even form distinguishes it from L. depressa. 

 (M. C. t. 459. f. 3.) 

 Loc. Plymouth. 

 Fig. 5, Leptcena Fragaria. Hemispherical, with slightly projecting sides, concentri- 

 cally waved, nearly smooth, pustulated ; beak of the convex valve pointed ; hinge- 

 line rather shorter than the width of the shell. 



This species approaches very closely to Producta pustulosa (Ph. loc. cit. PI. VIL 

 f 15.), or perhaps more nearly to P.rugata (Ph. PI. VII. f. 16.) ; but, wanting the 

 deep concentric rugae which mark these species, we have called it Fragaria, from 

 the collection of pustulose tubercles (probably the bases of spines) which cover its 

 surface pretty regularly ; it is however highly probable that all are varieties of one 

 species. 



Loc. Plymouth, Petherwin ? 

 Fig. 6 is probably the young of the preceding species ; the tubercles are more numerous 

 in proportion to the size. 

 Loc. Plymouth. 

 Fig. 7. Leptcena interrupta. Semicircular, very gibbose, concentrically ribbed ; longi- 



