[569] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 275 



ordinary high- water mark, in company with several species of Staphyli- 

 nidcej and will very likely be found on Long Island and the southern coast 

 of New England. 



PHILOSCIA VITTATA Say. 



Jour. Acad. Nat. Sei., Philadelphia, vol. i, p. 429, 1818. 



Under rubbish below high-water mark, Connecticut and Xew Jersey. 

 SPHJEROMA QUADRIDENTATA Say. Plate Y, fig. 21. (p. 315.) 



Jour. Acad. Nat. Sci. Philadelphia, vol. i, p. 400, 1818. 



Massachusetts to Florida. 



IDOTEA G^ECA Say. Plate Y, fig. 22. (p. 340.) 



L^. cit., p. 424, 1813. Gould, Invertebrata of Massachusetts, p. 337, 1841. 



Massachusetts to Florida. 

 IDOTEA TUFTSII Stimpson. (p. 340.) 



Marine Invertebrata of Grand Mauan, p. 39, 1853. 



Bay of Fundy and off New London, Connecticut. 

 - IDOTEA IRRORATA Edwards. Plate Y, fig. 23. (p. 316.) 



Hist. nat. des Crust., vol. iii, p. 132, 1840. Stenosoma irrorata Say, loc. cit., p. 423, 

 1818; Gould, Invertebrata of Massachusetts, p. 338, 1841. 



Bay of Fundy to Great Egg Harbor, New Jersey. 

 IDOTEA ROBUST A Kroyer. Plate Y, fig. 24. (p. 439.) 



Naturhist. Tidssk., 2d R., Bind ii, p. 108, 1846 ; Stimpsoii, Proceedings Acad. 

 Nat. Sci., Philadelphia, 1862, p. 133. 



South shore of Long Island to the Arctic Ocean. A pelagic species. 



IDOTEA PHOSPHOREA Harger, sp. nov. (p. 316.) 



Resembling I. irrorata in size and shape, but easily distinguished 

 from that species by the pointed abdomen. 



Antennae less than half the length of the body, antennulse attaining 

 the end of the third segment of the antennae. Front slightly excavated 

 with the lateral angles salient. Head about twice as broad as long, 

 turgid, and usually with a pair of tubercles on the vertex. Eyes placed 

 a little before the middle of the lateral margin, hemispherical, black. 

 First segment of thorax produced laterally around the back part of the 

 head nearly to the eyes, showing no epirneral sutures. Second segment 

 much longer on the median line, but shorter at the sides than, the first ; 

 the epimera occupy the anterior two-thirds of the lateral margin. Third 

 segment slightly longer than the second ; the epirnera occupying still 

 more of the lateral margin. Fourth segment of about the same length 

 as third ; the epimera occupying nearly or quite all the lateral margin. 

 The remaining three thoracic segments gradually decrease in size; the 

 epimera occupy the whole lateral margin and increase in size poste 

 riorly. The first two abdominal segments are distinct and acute at the 

 sides. The third is similar to these at the sides, but is only separated 



