INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 569 



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

 nidce^ and will Yer3' likely be found on Long Island and the southern coast 

 of ^ew England. 



Philoscia vittata Say. 



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

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



Sph^ro3IA quadridentata Say. Plate Y, fig. 21. (p. 315.) 



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



Massachusetts to Florida. 

 IDOTEA c^CA Say. Plate Y, fig. 22. (p. 340.) 



Loc. cit., p. 424, 1818. Gould, luvertebrata of Massachusetts, p. 337, 1841. 



Massachusetts to Florida. 

 iDOTEA TuFTSii Stimpsou. (p. 310.) 



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



Bay of Fundy and off: ^ew 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 ; Stimpsou, Proceedings Acad. 

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



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



Idotea phosphorea Harger, sp. no v. (p. 316.) 



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

 from that species by the pointed abdomen. 



AntenucT less than half the length of the body, antennul?e 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 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 oi 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 



