G42 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



mm. mm. 



Breadtli of carapax 4.0 4.2 



Length of rostrum from tip to base of ocular peduncle 5. 8 6. 4 



Length of basal scale of auteuna 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 Si^ecimens were from Somerville, S. C, and his descrip- 

 tion differed 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 bj^ 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 antennal scales, 

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

 with the description. 



Family Penjeid^e. 

 PENiEUS Brasiliensis Latreillc. 



Nouveau Dlctionuaire d'Histoire Naturelle, vol. xxv, p. 15i, (teste Edwards;) 

 I Edwards, Hist. Nat. des Crustac^s, vol. ii, p. 414 ; Gibbes, Oa the Carciuological 



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

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

 132, 1871 ; von Martens, Ueber Cubanische Crustaceen, 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 in the x>resent list. Dr. Stimpson says, " It was found in the 

 Crotou Iviver at Sing Sing, IST. Y., by Professor Baird, and by myself in a 

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

 of the Southern States, and extends south to Brazil. 



SCHIZOPODA. 



Family Mysid.^. 

 Mysis eelicta Loveu. (Plate I, fig. 2.) 



Om nagra i Vettern och Venern fauna Crustaceer, Ofversight af Veteuskaps 

 Akademiens Forhaudlingar, Stockholm, xviii, 1831, 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. 



Mijsla ocuJata, var. relicta, G. 0. Sars, Histoire Naturelle des Crustacds d'Eau 

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



Mysis dilm-ianus Stimpson, MSS. ; Hoy, Transactions Wisconsin Academy, vol. 

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



