Bulletin - United States National Museum . Fig. 34.—Segments from the Oth cirrus of {A) ^s pekcarinata, (Si HeteralepasREX, and (C) Alepas pacifica Hetexalepas consists of two series of species, whicli will probably beseparated eventually as distinct genera. In typical IlettralejMs the inner rami of cirri v and vi are greatlyreduced in size and number of segments, with the spines of the anteriorborder atrophied, small and weak. The outer rami of cirri v and vi,and both in cirri ii to iv, are very long, composed of extremel} numer-ous short segments, each armed with two or three yqvy l

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Bulletin - United States National Museum . Fig. 34.—Segments from the Oth cirrus of {A) ^s pekcarinata, (Si HeteralepasREX, and (C) Alepas pacifica Hetexalepas consists of two series of species, whicli will probably beseparated eventually as distinct genera. In typical IlettralejMs the inner rami of cirri v and vi are greatlyreduced in size and number of segments, with the spines of the anteriorborder atrophied, small and weak. The outer rami of cirri v and vi,and both in cirri ii to iv, are very long, composed of extremel} numer-ous short segments, each armed with two or three yqvy long spinesand three or two minute ones at the anterior distal angle, and a groupof several small spines at the posterior distal angle (tig. 34^, two inter-mediate segments of cirrus vi of //. re,i). In the new subgenus Paralepas the cirri ii to vi have subequalrami of comparatively few segments, each armed with a semicircular))rush of man} short spines on the anterior face and a group of several(about three) long stout spines at the pos

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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience