MARINE ISOPODA OF NEW ENGLAND, ETC. 



Specimens examined — Continued. 



347 



I960 

 1961 

 1962 

 1965 

 1966 

 2153 

 1908 



426 



1975 

 2150 

 1977 



1978 

 1979 



Locality. 



Xoank Harbor, Conn.. 



Fislier's Island 



Watch Hill, R I 



Vineyard Sound Mass . 



do 



...do 



Provincetown, Mass. . . 



...do 



...do 



...do 



...do 



Beverly, Mass 



Gloucester, Mass 



Gloucester, Mass., 



Outer Harbor. 

 Between Boon Island 



and Matinicus Rocks. 



Casco Bay, Me 



Casco Bay, Ram I 



George's Bank 



Bay of Fuudy 



Off Halifax, N. S 



Nova Scotia 



Durham coast, England 



Sf. 



L. w. 



L.w. 



Sf. 



7-10 



St. Vaast, la Hogue . 



L.w. 



Sf. 



L.-w. & 



sf. 



L.w. 



Bottom. 



Eel-grass 



Shore 



Eel-grass 



Tide-pool 



Sand, red algae . 



When col- 

 lected. 



Received 

 from — 



Aug. 

 Oct. 



Oct. 



Aug, 

 Aug, 

 Aug, 

 Sept. 



28. 1874 

 — , 1874 

 — , 1872 

 — , 1875 

 — , 1875 



24. 1875 

 — , 1872 

 — , 1879 

 — , 1879 

 -, 1879 



4, 1879 



Sept 



— , 1878 

 — , 1878 



— , 1878 



— , 1873 

 — , 1873 

 , — , 1872 

 — . 1872 



— , 1877 

 — , 1877 



U.S. Fish Com 



....do 



D.C.Eaton... 

 U.S. Fish Com, 



....do 



....do 



Smith &.Harger 

 U.S. Fish Com. 



....do 



...do 



....do 



A.E.Verrill... 

 U.S. Fish Com. 

 ...do 



Capt.G.H.Mar- 



tin. 

 U.S. Fish Com. 



...do 



Smith (feHarger 

 U.S. Fish Com 



....do 



....do 



Rev. A.M.Nor- 

 man. 



Jardin des 

 Plantes. 



-? B 



(zi& 



Dry. 

 Alo. 



Ale. 

 Alo. 

 Alo. 

 Alo. 

 Ale. 

 Alo. 

 Ala 

 Alo. 

 Alo. 

 Alo. 

 Alo. 

 Ale. 

 Alo. 

 Alo. 



Alo. 



Alo. 

 Alo. 

 Alo. 

 Alo. 



Alo. 

 Ala 

 Ala 



Alo. 



Idotea phosphorea Harger. 



Idotea pliosphorea Harger, This Eeport, part i, p. 569 (275), 1874 ; Proc. U. S. 



Nat. Mus., 1879, vol. ii, p. 160, 1879. 

 Verrill, Am. Jour. Sci., Ill, vol. vii, pp. 43, 45, 131, 1874; Proc. Amer. 



Assoc, 1873, pp. 362, 367, 369, 1874; This Report, part i, p. 316 (22), 



1874. 

 Whiteaves, Am. Jour. Sci., Ill, vol. \'ii, p. 218, 1874; Further Deep-sea 



Dredging, Gulf of St. Lawrence, p. 15, "1874." 



Plate V, Figs. 27-29. 



This species may be distinguished from the others on this coast 

 by the j)ointed abdomen or pleon. Young individuals sometimes re- 

 semble the young of I. irrorata, but may still be distinguished by the 

 epimeral sutures of the second and third thoracic segments, which 

 do not entirely cross the segment, but allow more or less of the poste- 

 rior part of the edge of the segment to form a part of the margin of the 

 animal as seen from above. From Synidotea nodulosa it may be distin- 

 guished by the evident epimeral sutures and by the three acute teeth 

 at the base of the pleon on each side, instead of a single obtuse tooth, 

 as in that species. For characters separating it from the other Isopoda 

 of the coast see at the close of the description of the genus. 



The body, especially of the young, is rough and tubercular along the 

 median line and often also laterally. Older specimens are much smoother, 

 losing their large median tubercles but never becoming as smooth as in the 

 preceding species. The head is narrowed behind. The eyes are of mod- 

 erate size. The flagellum of the antennae (pi. V, fig. 28 a) is shorter than 



