100 



gated, less solid, and lias the ribs larger and less numerous, and 

 its color more dusky. It may be compared with L. breviculus. 



The preceding descriptions w 

 the Boston Society of Natural 

 with — 



Page 1. Chiton lignosus . 

 " 11. Siphonaria cornuta 

 " 19. Helix pusilla . 

 " 24. Helix subtilissima 

 " 33. Partula conica . 

 " 41. Ancylus aduncus 

 " 46. Melania bulbosa 

 " 50. Natica algida . 

 " 52. Littorina patula 

 " 57. Trochus bicrenatus 

 " 59. Trochus tantillus 

 " 71. Columbella valga 

 " 73. Pholas patula 

 " 78. Erycina quadrata 

 " 83. Cardita ventricosa 

 " 86. Cyclas egregia 

 " 93. Mytilus flabellatus 

 " 98. Bulla parallela 



ere originally published in the Proceedings of 

 History, under the following dates, beginning 



