. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 313 Distribution.—Mediterranean (Claus) ; North Atlantic (Farran) ; coast of Norway (Sars); Chesapeake Bay (Wilson). Color.—Body very transparent and nearly colorless, but with a light orange tinge around the mouth and along the sides of the head. There is often a large oil bubble in the posterior part of the metasome and two smaller ones between the head and the first segment; eye orange-red. FeTTiale.—Body slender, metasome fusiform; rostrum strong, spini- form, and nearly straight; no highly colored plume
. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE REGION 313 Distribution.—Mediterranean (Claus) ; North Atlantic (Farran) ; coast of Norway (Sars); Chesapeake Bay (Wilson). Color.—Body very transparent and nearly colorless, but with a light orange tinge around the mouth and along the sides of the head. There is often a large oil bubble in the posterior part of the metasome and two smaller ones between the head and the first segment; eye orange-red. FeTTiale.—Body slender, metasome fusiform; rostrum strong, spini- form, and nearly straight; no highly colored plumes; urosome about as long as metasome; genital seg- ment dilated anteriorly; caudal rami as long as anal segment and divergent, the two middle apical setae twice as long as the uro- some, with scattered plumes. First antennae reaching the sec- ond abdominal segment; spines on exopods of swimmings legs ar- ranged as in flumifera. Ovisacs extending outward nearly at right angles to the body axis. Total length, mm. Male.—Much smaller and stouter than the female, the fore- head obtusely truncated, without any trace of a rostrum; urosome less than three-fifths the length of the metasome; genital segment much enlarged; caudal rami shorter than the anal segment and parallel. First antennae twice geniculate, but without any trace of the sheath or the semicircu- lar process found in flwmifera; setae of fifth legs much shorter than in the female. Total length, mm. Remarks.—Sars positively identified his Norwegian specimens with the species originally described by Claus. If this is correct, the new specific name atlantica proposed by Farran must yield prece- dence to the one first given to the species by Claus. Sars said of this copepod: " To judge from the structure of the oral parts, the animal must be of a very rapacious nature, probably feeding upon other small pelagic ; ^°. Figure 188.—Oithona spinirostris: a. Fe- male, dorsal; b, fema
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