304 BULLETIN OF THE 



Our species was properly placed in the genus Palcemonetes by Stimpson 

 in 1871.* 



A figure of the adult, by J. H. Emerton, is given on Plate II. of 

 Verrill and Smith's " Report upon the Invertebrate Animals of Vine- 

 yard Sound and the Adjacent Waters," and on page 235 of the same 

 work is a description of the first larval stage by Smith. t 



This species is common in shallow water along the eastern coast of 

 the United States from Hampton, N. H. (! Coll. Mus. Comp. Zool.), to 

 the St.. John's River, Fla. (G. Brown Goode). It is especially common on 

 sandy bottoms among the eel-grass, where, as Verrill well observes, its 

 color admirably adapts it for concealment. % It ascends far up into the 

 brackish water of estuaries and rivers. I have found it abundant in 

 the Charles River marshes, Cambridge, Mass., and Mr. G. Brown Goode 

 collected it in the St. John's River, Fla., twenty-two miles from the 

 mouth, where the water was perfectly fresh to the taste.§ On the 

 coast of New Jersey and the Carolinas it is associated with a nearly 

 allied species, Palcemonetes Carolinus Stimpson. || It is represented in 

 the fresh waters by a smaller and slenderer species, Palcemonetes exilipes 

 Stimpson,H which has a wide distribution in the rivers and lakes of the 

 Western and Southern States. 



* Notes on North American Crustacea in the Museum of the Smithsonian Insti- 

 tution, No. III. Ann. Lye. Nat. Hist. N. Y., Vol. X. p. 129. 1871. 



t Report on the Condition of the Sea Fisheries of the South Coast of New England 

 in 1871 and 1872, p. 529, PL II. Fig. 9. 1873. The description of the larva also 

 appears in Smith's " Early Stages of the American Lobster (Homarus Americanus 

 Edwards)." Trans. Conn. Acad., Vol. II. p. 377. 1873. 



£ Op. cit., p. 479. 



§ Vide S. I. Smith's " Stalk-eyed Crustaceans of the Atlantic Coast of North 

 America north of Cape Cod." Trans. Conn. Acad. Arts and Sci., Vol. V. p. 37. 

 1879. 



|| Op. cit,., p. 129. 



IF Op. cit., p. 130. This is probably the species described, from imperfect speci- 

 mens, under the name of Hippolyte paludosa, by Gibbes, in 1850 (On the Carci- 

 nological Collections of the Cabinets of Natural History in the United States. Proc. 

 Anier. Ass. Adv. Sci., 1850, p. 197), as claimed by Kingsley (Notes on the North 

 American Cariclea in the Museum of the Peabody Academy of Science at Salem, 

 Mass. Proc. Acad. Nat. Sci. Phila., 1878, p. 97). 



I observe in an ovigerous female of this species from Kentucky, preserved in alco- 

 hol, that the eggs are much larger in size and fewer in number than those of Palce- 

 monetes vulgaris. While the eggs of the latter, shortly after laying, measure about 

 .5 mm. in long diameter, those of the former (the embryo has seemingly hardly 

 begun to form) measure 1.25 mm. in length. Whether the fresh-water Palcemonetes 

 hatches from the egg in a more advanced phase of development than its marine rela- 



