. Bulletin - New York State Museum. (After Smith) ^^^^ mottlcd with ycllowish. The only fresh-water Isopod found in New York city. Occursunder stones in brooks and ponds everywhere. Family forms, much like Asellidae. The first pair of pleopodain the female are a large opercular plate. To the correspondingplate of the male the copulatory appendages are joined laterally,succeeding pairs delicate. Jaera marina (Fab.) Oniscns marinus Fabricius. Fauna Gronlandica. c o p i o s a Verrill. 1874. albifrons Harger. /. c. 1880. , , m
. Bulletin - New York State Museum. (After Smith) ^^^^ mottlcd with ycllowish. The only fresh-water Isopod found in New York city. Occursunder stones in brooks and ponds everywhere. Family forms, much like Asellidae. The first pair of pleopodain the female are a large opercular plate. To the correspondingplate of the male the copulatory appendages are joined laterally,succeeding pairs delicate. Jaera marina (Fab.) Oniscns marinus Fabricius. Fauna Gronlandica. c o p i o s a Verrill. 1874. albifrons Harger. /. c. 1880. , , marina Richardson. /. c. 1901. Body oval, slightly more than twice as long as broad. Anten-nulae short, antennae more than half the length of body and withmultiarticulate flagellum. Pleon in one piece, semicircular, withshort uropoda rising from a notch in the end. Length 5 mm, breadth 2 mm, males about one third shorter andsomewhat narrower. Color very variable, slaty gray with blotches HIGHER CRUSTACEA OF NEW VORFv CITY 179. of yellow and reddish brown. Some arc lii^iit colored or nearlyAvhite, often with two or more transverse bands, forming a strikinglooking animal. A cry fre-quently also shades oflight or dark green occur,and the incubatory lamel-lae of the female are oftenbright green. Very conuuon all alongthe shore below high tideon rocks under seaweedswhere their color is pro-tective, or clinging to theundersides of stones orboards. Frequently foundin the little pools left onthe rocks by the tide. Found commonly all along the coast. Fig. 51 Jaera marina (After Harger) 5 ONTSCOIDEA The tribe Oniscoidea is almost unique among Crustacea in beingentirely terrestrial, even the early stages being passed on are oval forms with a more or less depressed body, and thefused head and hrst thoracic segment are sunk in the second. Thefirst antennae are very small, three-jointed and placed on the frontof the head. The second antennae are long and consist of apeduncle
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
