[569] INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 275 
ordinary high-water mark, in company with several species of Staphyli- 
nide, 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, 1818. 
Under rubbish below high-water mark, Connecticut and New Jersey. 
SPHHZROMA QUADRIDENTATA Say. Plate V, fig. 21. (p. 315.) 
Jour. Acad. Nat. Sci. Philadelphia, vol. i, p. 400, 1818. 
Massachusetts to Florida. 
IDOTEA CaicA Say. Plate V, fig. 22. (p. 340.) 
Loc. cit., p. 424, 1818. Gould, Invertebrata of Massachusetts, p. 337, 1841. 
Massachusetts to Florida. 
IporEA TUFTSII Stimpson. (p. 340.) 
Marine Invertebrata of Grand Manan, p. 39, 1853. 
Bay of Fundy and off New London, Connecticut. 
IDOTEA IRRORATA Edwards. Plate V, 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. 
IDorEA ROBUSTA Kroyer. Plate V, 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.) 
Resembling JI. irrorata in size and shape, but easily distinguished 
from that species by the pointed abdomen. 
Antenne less than half the length of the body, antennule attaining 
the end of the third segment of the antenne. 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 
alittle 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 
