356 ' INDEX. 



Pontella simplex, D., 29. 



speciosa, D., 34. 



strenua, D., 32. 



turgida, D., 28. 

 Pyctilus, gen., 218. 



R. 



Rain, at a very low temperature, 262. 



Report on the offer of the Boston Athenaeum, 301. On the classi- 

 fication of the Fellows and Members of the Academy, 285, On 

 coast marks, 221. On United States Coast Survey, 124. On 

 Lieutenant Davis's paper, 288. On Professor Eustis's plan of the 

 Middlesex tornado, 301. On meteorological observations, 231. 

 Of Rumford Committee on a communication of Mr. Frost, 129. 

 On the Statutes, 163. 



Richella, gen.. Gray, 325. 



monosperma, G., 325. 



Rumford Committee, 129, 199, 226, 272. 



Rumford, Count, letters of, 245. 



S. 



Sand strata, distortion of, 282. 

 Sapphirina, gen., 40. 



angusta, D., 41. 



bella, D., 44. 



coruscans, D., 41. 



detonsa, D., 43. 



elongata, D., 41. 



gemma, D., 44. 



incBqualis, D., 42. 



indigoiica, D., 43. 



iris, D., 41. 



metallina, D., 41. 



ohesa, D., 45. 



obtusa, D., 46. 



opalina, D., 45. 



orientalis, D., 43. 



