Average Size of Average Size of Corpuscle Microns Nucleus Microns Common Name Scientific Name Length Breadth Length Breadth ------------------------------------------------------------------------- Western Gull Larus occidentalis 14.70 8.82 6.53 3.27 Heermann Gull Larus heermanni 14.05 7.84 6.21 2.77 Great Blue Heron Ardea herodias 13.72 8.82 6.53 3.27 Red-breasted Merganser Mergus serrator 13.07 7.51 6.86 2.77 Arkansas Kingbird Tyrannus verticalis 12.77 9.47 5.55 3.10 California Road Runner Geococcyx californianus 12.09 9.15 5.27 3.27 Long-billed Dowitcher Macrorhamphus griseus scolopaceus 12.41 8.49 5.24 2.46 Least Tern Sterna antillarum 11.76 8.46 6.21 2.94 Semipalmated Plover Ægialitis semipalmata 11.43 6.21 5.24 2.77 Arizona Hooded Oriole Icterus cucullatus nelsoni 11.27 8.49 4.41 2.94 San Diego Song Sparrow Melospiza melodia cooperi 10.94 8.33 5.27 2.53 Least Vireo Vireo pusillus pusillus 10.45 9.47 5.55 2.77 California Woodpecker Melanerpes formicivorus bairdi 10.45 6.53 5.24 2.77 Belding Marsh Sparrow Passerculus beldingi 10.08 6.86 4.90 2.77 Willow Gold Finch Astragalinus tristis salicamans 9.80 6.79 6.04 2.94 California Horned Lark Otocoris alpestris actia 9.47 6.21 4.25 2.12 Western Lark Sparrow Chondestes grammacus strigatus 8.49 5.55 5.24 3.10 _(Contribution from the Zoological Laboratory of Pomona College)_ Caprellidæ from Laguna Beach R. LA FOLLETTE This paper is a preliminary article on the Caprellidæ of Laguna Beach, and deals with species that have so far been identified. Because of great variation, due to age, it is very difficult to place the different forms. _Caprella geometrica_ Say Mayer places _C. geometrica_ as one of eighteen or twenty varieties of the species _acutifrons_, but I have thought it best to follow some of the other writers and use _geometrica_ as the species name, as my specimen closely resembles the species which seems to be _C. geometrica_ in several accounts.