594 
Murchi sonia, 292. 
Mya arenaria, 133. 
Mylacris packardii, 214. 
Mytilus edulis, 133. 
Nabalus sp., 184. 
Nadata, 511, 558. 
Nahant, geology of, 91; paleontological 
horizon of the limestone at, 261. 
Nampa image, 424. 
Nanomia, 205. 
Natural History Gardens and Aquaria, 90, 
243 ; vote of the Society in regard to 
the, 562. 
Nematocampa filamentaria, 514. 
Nepticula, 507. 
Nerice, 512, 559. 
bidentata, 525. 
davidi, 525. 
Nerodia, 179. 
New Jersey, geographic development of, 
365. 
Northern Pacific Railroad, fungi collected 
along, 182. 
Notodonta, 512, 559. 
stragula, 525. 
Nyssa sylvatica, 506. 
Obolella cingulata, 359. 
Odontopteris, 214. 
(Eceticus, 510. 
CEdemasia, 559. 
concinna, life-history of, 532. 
(Enothera biennis, 184. 
sp., 184. 
Officers for 1888-89, 15 ; for 1889-90, 260. 
Olenellus thompsoni, 60, 359. 
vermontana, 359. 
Olenus, 73. 
Olygia versicolor, 513. 
Ophiobrachion, 116. 
Ophiocoma, 109. 
Ophiopholis, 109. 
aculeata, 31. 
Ophiopteron, 110. 
Ophiothrix, 109. 
Orgyia vetusta, 497. 
Ornithopus gallinaceus, 118. 
gracilior, 118. 
Ornithorhynchus, 474. 
Orthis biforata, 312, 351. 
calligramma, 308. 
elegantula, 307, 351. 
fasciata, 309. 
flabellites, 311. 
flabellulum, 309. 
pectinella, 312. 
Orthoceras annulatum. 282. 
clavatum, 279. 
conoideus, 286. 
crawfordi, 281, 284. 
daytonensis, 286. 
duseri, 284. 
lianoverensis , 280. 
ignotum, 279. 
inceptum, 286. 
jamesi, 283. 
lata-nummulatm, 285. 
nova-cax-lislensis, 281. 
rectum, 278. 
rhythmoides, 279. 
rigidum, 282. 
tenui-siphonatum , 278. 
turgida-nummulatus , 285. 
virgulatum, 278. 
Orthoceras youngi, 284, 285. 
Orthodactylus floriferus, 119. 
introvergens, 119. 
linearis, 119. 
Osmorrhiza brevistylis, 187. 
Ostrea virginiana, 133. 
Otozoum caudatum, 119. 
moodii, 119. 
parvum, 119. 
Oxynoticeras, 17. 
greenoughi, 26. 
oxynotum, 19. 
Oxyporus, 468. 
Pachydictya, 331. 
Packard, A. S. Hints on the evolution 
of the bristles, spines, and tubercles 
of certain caterpillars, apparently 
resulting from a change from low- 
feeding to arboreal habits; illustrat- 
ed by the life-histories of some No- 
todontians, 494; the life-history of 
Drepana arcuata, with remarks on 
certain structural features of the 
larva and on the supposed dimor- 
phism of Drepana arcuata and Dry* 
opteris rosea, 482; paleontological 
notes, with fig., 209. L 
Paheocaris typus, 213. 
Palamopus clarki, 119. 
Palaphrodes, 567. 
Palecphora, 567. 
Paleontology, 17, 45, 117, 127, 209, 261, 263, 
467, 562. 
Palmipes, 102. 
Panicum capillare, 1S9. 
glabrum, 190. 
Panolis piniperda, 511. 
Paradoxides, 73, 262, 359, 505. 
bennetii, 74. 
kjerulfi, 74. 
Parasite of Amphiura, 31. 
Parorgyia, 514. 
Patrobus, 468. 
Pecten islandicus, 133. 
Pelobates l'uscus, 470. 
Pemphigus, 568. 
Pentamerus microcamerus, 321. 
oblongus, 348. 
ovalis, 324, 347. 
Perameles, 475. 
nasuta, 478. 
Peristedion cataphractum, 471. 
Peronospora arthuri, 184. 
halstedii, 183. 
parasitica, 184. 
ribicola, 183. 
trifoliorum, 184. 
Petalophthalmus armatus, 213. 
Petalostemon violaceus, 187. 
Petrogale, 475. 
Phacops pulchellus, 268. 
Phaenopora fimbriata, 330, 351. 
magna, 331, 351. 
Phalangista, 475. 
Pheocyma, 494. 
Pheosia, 558. 
dictasa, 512. 
dictaeoides, 512. 
rimosa, partial life-history of, 523. 
Philadelphia red gravel, age of, 152. 
Phragmidium fragariae, 189. 
mucronatum, 189. 
potentillae, 189. 
rubi-idaei, 189. 
P&yllactinia suffulta, 185, 
