The Central Nervous System of the Pycnogonid Lecythorhynchus, 134. =Bacon, Gertrude Auld= The Distribution of Collembola in the Claremont-Laguna Region of California, 137. Wants and Exchanges, 185. Volume VI, Number 4 =Moles, Margaret M.= Pseudoscorpions in the Claremont-Laguna Region, 187. =Hilton, Wm. A.= Some Points in the Nervous System of a Large Deep Water Crab, 198. =Banks, Nathan= A New Pseudoscorpion from California, 203. =La Follette, R.= A Nebalia from Laguna Beach, 204. Starfish of Laguna Beach, 209. =Hughes, Miss S. P.= Barnacles of Laguna Beach, 212. =Lichti, P. A.= Notes on the Eggs of Some Laguna Beach Invertebrates, 215. =Hamilton, W. F.= Preliminary Notes on Some Marine Worms Taken at Laguna Beach, 217. =Wang, Chi Tsau= Studies in the Comparative Size of the Red Blood Corpuscles of Birds, 221. =La Follette, R.= Caprellidæ from Laguna Beach, 222. Short Notes, 233. =Gardner, Leon L.= Additional Notes on the Birds of Laguna Beach, 235. =Cockerell, T. D. A.= A New Dipterous Gall on Stanleya, 240. =Bean, Prof. A. M.= Hydroids of Laguna Beach, 242. Summer School at Laguna Beach, 245. Index to Volume VI Acarina, 55. Achorutes, 165. californica, 165. citri, 166. Actitis macularius, 237. Ægialitis novisa, 237. semipalmata, 237. Aglaophenia inconspictus, 243. Aglaophenia struthionides, 243. Alexander, C. P., 12, 105. Ammodramus savannarum bimaculatus, 238. Anisomera longicornis, 21. Antenella avalonia, 243. Aplonyx sarcobati, 93. Aphoruridæ, 168. Aphorura, 170. lutea, 170. montis, 171. Arrhenica spinosa, 27. Asterina miniata, 211. Astroglinus tristis salicamans, 238. Asteropecten erinoceus, 211. Atemnus hirsutus, 203, 195. Bacon, G. A., 45, 84, 137. Balanus nubilus, 213. tintinnabulum californicus, 212. Banks, Nathan, 55. Barnacles, 212. Bdellidæ, 55. Bdella utilis, 55. Bean, A. M., 242. Birds, Laguna Beach, 235. Buteo borealis colurus, 237.