356 The American Naturalist. [April, 
Gangliogen. No invaginations occur. Ommatidum consists of 
two corneagen cells, four vitrelle, and seven retinular cells. No 
nerve fibres are found in crystallin cones. 
Osporn, H. L—Elementary Histological Studies of the Cray- 
fish. XII. The Eye, Am. Mo. Micro. Jour., X., p. 25, 1889. 
XIII. The Eye, 1. œp. 147, 1889. 
Cuaney, L. W.—Some habits of the Crayfish. Am. Mo. Micro. 
Jour., X., p. 86, 1889.—Eating, locomotion, oviposition, molting. 
PACKARD, A. S—The Cave Fauna of North America, etc. 
Mem. Nat. Acad. Science, IV., 1889.—Describes Cauloxenus 
stygius, Canthocamptus cavernarum, Cecidotea stygia, C. nicka- 
jacensis, Crangonyx vitreus, C. packardi, C. antennatus, C. muco- 
natus, C. lucifugus, Cambarus pellucidus, C. hamulatus ; and gives 
notes on brain and optic organs of Cæcidotæa and Cambarus. 
ARACHNIDA. 
Ives, J. E—Linguatula diesingii from the Sooty Mangubey. 
Proc. Phila. Acad, 1580, p. 31. 
LEIDY, JosepH.—Note on Gonyliptes and Solpuga, l.c., p. 45. 
-Gonyleptis curvipes from Chili and Solpuga cube from Florida. — 
Marx, GrorcE.—A contribution to the knowledge of the 
spider fauna of the Bermuda Islands, 1. c., p. 98, 4 Pl. Cata- 
logues twelve species as collected, one of which, Lycosa atlantica, 
is new. 
PATTEN, Wo.—Segmental sense organs of Arthropoids. Jour. 
Morphol., II., p. 600. A preliminary paper giving an account of 
eyes and other sense organs of Limulus, spiders and scorpions. 
Wartase, S.—Structure and development of the eyes of Limu- 
lus. J.H.U.Circ., VIIL, p- 34, 1889. (See Am. Nat, XXIV., p. 
81.) Preliminary communication. 
Jackson, C. Q.—The Acarus folliculorum in the human skin. 
Microscope, IX., p. 97, 1889.—Nothing new. 
Emerton, J. H.—Pairing of Xysticus triguttatus. Psyche, V. 
p. 169, 1889. 
Packarp, A. S.—The Cave Fauna of North America. Mem. 
Nat. Acad. Sci., IV., 1889.—Describes Rhyncholophus caverna- 
