INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 569 



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

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

 of New England. 



Philoscia vittata Say. 



Jour. Acad. Nat. Sci., Philadelphia, vol. i, p. 429, 1813. 



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

 Sph^eroma quadridentata Say. Plate V, fig. 21. (p. 315.) 



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



Massachusetts to Florida. 

 Idotea ceca Say. Plate V, fig. 22. (p. 340.) 



Loc. cit., p. 424, 1818. Gould, Invertebrata of Massachusetts, p. 337, 1641. 



Massachusetts to Florida. 

 Idotea Tuftsii Stimpson. (p. 310.) 



Marine Invertebrata of Grand Manan, 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 robusta Kroyer. Plate Y, fig. 24. (p. 439.) 



Naturhist. Tidssk., 2d R., Bind ii, p. 108, 1846; Stimpson, 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.) 



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

 from that species by the pointed abdomen. 



Antennas less than half the length of the body, antennulas attaining 

 the end of the third segment of the antennas. 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 epimeral 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 epimera 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 



