€42 EEPOET OF COMMISSIONER OF FISH AND FISHERIES. 



7nm. nun. 



Breadtli of carapax 4.0 4.2 



L,engtli of rostrum from tip to base of ocular peduncle 5. 8 6. 4 



Length of basal scale of antenna 5-4 5. 6 



I have seen only half a dozen specimens, which agree very closely with 

 each other. All but one of them have seven teeth on the upper edge of 

 the rostrum and two below, while this one has eight above and one below. 



Collected by Mr. J. W. Milner at Ecorse, Mich., and in a grassy arm 

 of Sandusky Bay, Lake Erie, known as the " Black Channel." 



As Stimpson's specimens were from Somerville, S. C, and his descrip- 

 tion diftered considerably from the Lake Erie specimens, I supposed, at 

 the time the above description was written, that the northern specimens 

 represented a distinct species. Since the manuscript was in the hands 

 of the printer, however, I have received a large series of specimens col- 

 lected by Dr. Edward Palmer in fresh-water streams in Florida, which 

 evidently belong to Stimpson's species, and at the same time show that 

 the Lake Erie specimens are undoubtedly of the same species. Most of 

 the Florida specimens, like those from Lake Erie, differ from Stimpson's 

 description in having the rostrum not longer than the anteunal scales, 

 Init in a few of them it is very slightly longer, so that they agree well 

 with the description. 



Family Pen.i^id.e. 

 PEN.15US Beasiliensis Latreille. 



Nonveau Dictiouuaire d'Histoire Nattirelle, vol. xxv, p. liji, (teste Edwards;) 

 EdwardSj Hist. Nat. des CrustacfSs, vol. ii, p. 414 ; Gibbes, On the Carciuological 

 Collections of the United States, Proceedings Americaa Association, 3d meet- 

 ing, p. 170, 1850 ; Stimpson, Annals. Lyceum Nat. Hist. New York, vol. x, p. 

 132, 1871 ; von Martens, Ueber Cubanische Crastaceeu, Archiv fiir Naturge- 

 schichte, 1872, vol. xxxviii, p. 140. 

 This is perhaps more properly a marine than a fresh-water species ; 

 but as it ascends fresh- water streams for long distances, it should be 

 included iu the present list. Dr. Stimpson says, "It was found in the 

 Croton Eiver at Sing Sing, N. Y., by Professor Baird, and by myself in a 

 fresh- water creek near Somers' Point, ]S". J." It is common on the coast 

 of the Southern States, and extends south to Brazil, 



SCHIZOPODA. 

 Family Mysid.ts. 

 Mysis relicta Loven. (Plate I, fig. 2.) 



Om nagra i Vettern och Venern fanna Crnstaceer, Ofversigbt af Veteuskapa 

 Akademiens Forhandlingar, Stockholm, xviii, 1861, p. 285; Smith, American 

 Journal of Science, 3d series, vol. ii, pp. 374, 452, 1871 ; and Preliminary Re^ 

 port on Dredging in Lake Superior, in Report of Secretary of War, vol. ii, Re- 

 port of Chief of Engineers, p. 1022, 1871. 



Mijsis ocuJata, var. relicta, G. O. Sars, Histoiro Naturelle des CrustactSs d'Eau 

 Douce de Norvfege, 1" livraison, p. 14, plates 1-3, 1867. 



Mysis dilurianus Stimpson, MSS. ; Hoy, Transactions Wisconsin Academy, vol. 

 i, p. 100, 1872, (no description.; 



