424 



Metapodius confraternus, 99. 



insiabllis, 98. 

 Metoptoma, 54. 

 Metrobates, 108. 



hesperius, 109. 

 Micrathene Whitneyi, 300. 

 Microceras arcigerens, 36. 

 biferum, 34. t 

 crescens, 36. 

 laticosta, 35. 

 Microderoceras Birchii, 32. 



Hebertii, 33. 

 Microscope, low powers for, 44. 

 Mictidse, 98. 

 Mimus polyglottus, 277. 

 Mibtot, Char. S. Notes on tbe fligbt 

 of butterflies, 55; injuries caused by 

 Capsus quadrivittatus, 392. 

 Mniotilta varia, 331. 

 Mniotiltidae, 278, 300. 

 Mollusca, adaptive coloration in, 141. 

 Molothrus pecoris, 374. 

 Mongous, 131. 



Morse, Prof. E. S. Structure of Phas- 

 colosoma, 61; reply to Mr. Ball's re- 

 marks on Brachiopoda, 135; relation- 

 ships of the Tunicates, 137; on the 

 adaptive coloration in Mollusca, 141; 

 relationship of Anomia, 150; early 

 stages of an Ascidian, 351; observa- 

 tions on the spittle-insect, 891. 

 Motacillidae, 330. 

 Myiadestes obscitrus, 277. 

 Myiarchus crinitus, 376. 



Lawrencii, 279. 

 mexicanus, 278. 

 Myiodioctes canadensis, 369. 

 pusillus, 389. 



Nacella, 53. 



Nautiloids, development of, 398. 



Neides decurvatus, 100. 



Ne'ottiglossa undata, 93. 



Nil.es, W. H. Some phenomena in 



quarrying, 80; on conglomerate, 128, 



129. 

 Nominating Committee, report of, 1. 

 Nvctale acadica, 331. 

 Nyctea nivea, 381. 

 Nyctherodius violaceus, 285, 301. 

 Nyctidromus albicollis, 273. 



Officers for 1871-2, election of, 285. 

 Otus Wilsonianus, 381, 

 0?;ophora, 102. 



picturata, 102. 



Pachycoridaa, 93. 



Packard, A. S., Jr., M.B. Embryology 



of Isotoma, 13; on the development of 



Limulus, 60. 

 Panclion carolinensis, 268, 382. 

 Pariclae, 358. 

 Parus atricapillus, 358. 

 Parula americana, 331. 



insularis, 278, 300. 

 Passerculus savanna, 372. 

 Passerella iliaca, 873. 

 Patella, 52. 



Patellidse, 52. 



Patina, 53. 



Patinella, 53. 



Pelecanidae, 302. * 



Pelecanus fuscus, 302. 



Pelionetta perspicillata, 385. 



Pentatomidce, 98. 



Perisiglossa tigrina, 338. 



Perisoreus canadensis, 375. 



Peritrechus f rat emus, 103. 



Perry, Rev. J. B. On the Glacial 

 Period in New England, 62; remarks 

 on Br. Jackson's objections to the 

 glacial theory, 68; nature of the"Sco- 

 lithi," 139; on the Eozoon limestones 

 of Massachusetts, 199. 



Petrochelidon lunifrons, 369. 



Phascolosoma, structure of, 61. 



Philohela minor, 383. 



Phoca, nerve plexus in the lip of, 391. 



Pholcus, development of, 393. 



PicidEe, 273, 380. 



Pickering, Br. Chas. Remarks on 

 the glacial theory, 75 ; on drift, 91 ; on 

 the agency of heat in holding water 

 on the surface of the globe, 127; on 

 conglomerate, 128. 



Picoides arcticus, 380. 

 hirsutus, 380. 



Picus pubescens, 380. 

 scalaris, 273. 

 villosus, 380. 



Pieris rapae, 388. 



Pilidium, 50. 



Pinicola canadensis, 371. 



Pipilo carmani, 299. 



erythrouthalmus, 374. 



Platypeltis ferox, 16. 



Plectrophanes lapponicus, 372. 

 nivalis, 372. 



Pleurosigma robustum, 260. 



Plociomerus constrictus, 101. 

 dlffibsus, 101. 



Ploiaria, 391. 



Ploiaria errabunda, 107. 



Podicepscornutus, 385. 



Podicipidas, 385. 



Podilymbus podiceps, 385. 



Podisus serieventris, 94. 



Pcecetes gramineus, 372. 



Polyborus Audubonii, 208. 



Porzana Carolina, 384. 



Pourtales, B. F. de. Constitution of 

 the bottom of the ocean off Cape fiat- 

 teras, 59. 



President, election of, 3. 



Progne subis, 370. 



Proteobranchiata, 51. 



Psittacidae, 271, 298. 



Psittacula cyanopyga, 271. 



Pteromalus puparum, 388. 



Ptochiomera nodosa, 100. 



Ptychemys concinna, 17. 



Putnam, F. W. Notice of the burning 

 of Chicago Academy of Sciences, 386. 



Pygolampis pectoralis, 107. 



Pygoscelis, 242. 



adelia?, 250. 

 antarctica, 250. 



