282 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [576] 



The Lepeophtlieirus salmonis Kroyer, is found upon the salmon of the 

 northern coast of New England. 



ECHTHROG-ALEUS COLEOPTRATUS Steeiistrup and Liitken. (p. 459.) 



Op. cit., 380. Dinematura coleoptrata Gue&quot;rin, Icnographie du Regne animal, Crnst. 

 PI. 35, fig. 6. Dincmoura alta Baird, British Entomostraca, p. 285, PI. 33, ligs. 

 6,7. 



Vineyard Sound, September 19, from the back fin of the mackerel- 

 shark, (Lamna punctata.) It has been found upon the English coast and 

 oif the Azores. 



ECHTHROG-ALEUS DENTICULATUS Smith, sp. nov. (p. 459.) 



Carapax broader than long, with a very slight median emargi nation 

 in the outline of the front. Posterior portion of the body scarcely longer 

 and not quite as wide as the carapax. Dorsal plates, or elytra, covering 

 much more than half the genital segment, their inner and posterior 

 margins armed with a regular series of small teeth. The posterior lobes of 

 the genital segment somewhat triangular and each terminated by a stout 

 spine. Dorsal plate of the tail elongated, obtusely rounded at the ex 

 tremity, and exposed from above by the very broad sinus in the genital 

 segment. The tail itself broad, somewhat rectangular, but narrowed dis- 

 tally and not projecting behind the dorsal plate ; the terminal lamella} 

 nearly as long as the tail, narrow, linear, nearly three times as long as 

 broad, and armed at the tip with several setae. 



Length, 9 mm ; breadth of carapax, 5.1 ; length of elytra along the inner 

 margin, 2.5. 

 Vineyard Sound, on Atwood s shark, (CarcJiarias Atwoodi.} 



?PANDARUS CRANCIIII Leach, (p. 459.) 



Diet, des Sci. nat., tome xiv, p. 535, 1819, (teste Edwards et al.;) Edwards, Rogue 

 animal do Cuvier, 3 me cd.. Crust., PI. 73, fig. 2 ; Steeiistrup and Liitkeu, op. 

 cit., PL 11, fig. 22. 



A number of specimens of a Pandarus, taken from a dusky shark 

 (Eulamia obscura) on the south side of Long Island in 1870, differ only 

 very slightly from the figures and descriptions of P. Cranchii quoted 

 above. 

 PANDARUS, species. Plate VII, fig. 31. (p. 457.) 



Vineyard Sound, on Atwood s shark, (CarcJiarias Atwoodi.} It is, per 

 haps, only a variety of the last species, but differs considerably from it, 

 wanting almost wholly the series of spines upon the posterior margin 

 of the carapax, having the caudal appendages shorter and obtuse, besides 

 some slight differences in the natatory legs. 



NOGAGUS LATREILLII Leach. Plate VII, fig. 32. (p. 457.) 



Diet. des. Sci. nat., tome xiv, p. 536, 1819, (teste Edwards et al. ;) Regne animal 

 cle Cuvier, Crust., PI. 79, fig. 3 ; Hist. nat. des Crust., tome iii, p. 459 ; Steen- 

 strup and Liitken, op. cit., p. 384, PI. 9, fig. 18. 



Vineyard Sound, in company with the last species, on Atwood s shark. 

 All the species of Nogagus are males of the allied genera, Pandarus, 



