162 



EXPLANATION OF THE PLATES. 



Fig 



37. The two valves oi Area Pectim- 



ClllllS. 



a. a. the beaks. 



38. Area Norn. 



Plate 4. 



39. One valve of Oslrea Malleus. 



a. the hollow where the carti- 



lage is fixed. 



b. the hollow for the byssus. 



c. the muscular impression. 



40. Ostrea Ephippiitm. 



41. opercularis. 



a. the connecting cartilage. 

 b.b. the ears. 



43. Ostrea Lima. 



44. Crenatula 3Ti/filoides. 



45. Anomia Grj/pfius. 



46. Plaeenta. 



a. the two diverging ridges. 



b. the corresponding hollows. 



47. The flat valves oi Anomia Ephip- 



pium. 

 a. the perforation. 



48. Mt/tilus Modiolus. 



49. anatimis. 



50. Hirundo. 



51. Pinna muricata. 



Plate 5. 



63. Argonauta Argo. 



54. Nautilus Pompilius. 



a. a part of the outer shell re- 

 moved, to show the inter- 

 nal construction. 



55. Nautilus Spirula. 



56. ohliquns magnified. 



a. the natural size. 



57. Nautilus Fascia magnified. 



a. the natural size. 



58. Nautilus Beecarii. 



59. Conus marmoreus, with the ani- 



mal. 



Fig 



59, 



60 



61 



61, 

 61 



62 

 63 

 64 

 65 

 66 

 67 



a. a. the horns. 

 6.6. the eyes. 



c. the M indpipe or breathing- 



tube. 



d. the operculum. 



Conus Mereator. 



a. the spire. 



b. the base. 



c. the outer lip. 



e. the apex. 



a.CyprcBa Caput serpcntis, with the 

 animal. 

 b.b. the horns. 



c. tlie windpipe. 

 (/.(/. the side membranes which 

 cover the shell. 



h.Cyprma Caput serpentis. 



c. A young shell of the Ci/prcea; 

 genus not perfectly formed. 



. Bulla aperta. 



. Terebellum. 



, Ficus. 



. Ampulla. 



68. 

 69. 

 70. 



71. 

 72. 



73. 

 74. 



75. 



ej/lindrica. 



Plate 6. 

 Voluta porphyria. 

 Oliva. 



mustea. 



a. the folds or teeth on th 



pillar lip. 



b. the hollow or notch at the 



base. 



c. the outer or right lip. 



d. the apex or point of the 



spire. 



Voluta papalis. 



mercatoria. 



glabella, 



eancellata? 



Pyrum. 



a. the teeth on the pillar lip. 



Voluta Cojfea. 



