. Bulletin - United States National Museum. Science. I80PODS OF NORTH AMERICA. 161 half as lono- as the ramus itself; external ramus narrow, with about eight spines and munerous seta? on the })osteri()r and outer margin. "This s|)ecies is close to A. in-snlarU, from which it differs in its greater hairiness. "Two specimens. Station 6079, 20 fathoms, 5 by 2.;-i ;— ; 28. Genus TRIDENTELLA, new genus. First pair of antenna^ with peduncle composed of three articles. First maxilhe with the apex of the third article furnished with three Second maxilla^ indistinc
. Bulletin - United States National Museum. Science. I80PODS OF NORTH AMERICA. 161 half as lono- as the ramus itself; external ramus narrow, with about eight spines and munerous seta? on the })osteri()r and outer margin. "This s|)ecies is close to A. in-snlarU, from which it differs in its greater hairiness. "Two specimens. Station 6079, 20 fathoms, 5 by 2.;-i ;— ; 28. Genus TRIDENTELLA, new genus. First pair of antenna^ with peduncle composed of three articles. First maxilhe with the apex of the third article furnished with three Second maxilla^ indistinctly bilobed at the tip. Mandibles becoming narrower from the base to the apex; movable lacinia absent; molar part well developed. Clypeus wide and short, in the form of an inverted v, with the post-lateral angles produced almost to the articulation of the mandib- ular palp. Labrum small. TRIDENTELLA VIRGINIANA (Richardson). Cirolana rirginUtna Richardson, American Naturalist, XXXIV, 1900, \). ^16; Proc. u". S. Nat. Mus., XXIII, 1901, pp. 512-513. Locality.—Chesapeake Bay. Depth.—81 fathoms. Body not quite twice as long as broad, oval, thickset. Head trans- verse, with indications of four small tubercles, two on the anterior portion, between the eyes, and two on the posterior portion. E3^es large, lateral. First pair of antenme long, nearly as long as the second pair, reaching the posterior margin of the first thoracic segment; fiagel- lum twelve-jointed. Second pair of antenna' extend to the middle of the third thoracic segment; fiagellum yig. ni.—triden- eighteen-jointed. tella virginiana. T-i- , ,1 • , 1 1 1,' i- 1 Frontal lamina, first thoracic segment one and a halt times longer ,-LYPf:us and lab- than any of the other segments. Following segments r^'m- (Diagram- of equal length. First abdominal segment almost entirely concealed by last thoracic segment. Four succeeding segments of equal length. Terminal seg- ment very short and narrow, not longer than the fo
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