576 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



The Lepeoplitheirus salmonis Kroyer, is foiiud upou the salmon of the 

 northern coast of New England. 



EcHTiiROGALEUS COLEOPTRATUS Steenstrup aud Liitken. (p. 459.) 



Op. cit., 380. Dinematura coleoptrata Gu6rin, Icnograpbie clu Rfegue auimal, Crust. 

 PI. 35, fig. 6. Dinemoura aJta Baircl, British Eutomostraca, p. 28.5, PI. 33, figs. 

 6,7. 

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

 shark, {Lamna imnctata.) It bas been found ujion the English coast and 

 off the Azores. 



ECHTHROGALEUS DENTICULATUS Smith, sp. nov. (p. 459.) 



Carapax broader than long, with a very slight median emargination 

 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 aud not i^rojecting beliind the dorsal plate ; the terminal lamellae 

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

 broad, and armed at the tip with several seta>. 



Leugth, 9'"™ ; breadth of carapax, 5.1 ; length of elytra along the inner 

 margin, 2.5. 



Vineyard Sound, on Atwood's shark, [Carcliarias Attcoodi.) 



?Pandarus Cranchii Leach, (p. 459.) 



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

 auimal de Cuvier, 3™<^ cd., Crust., PI. 78, fig. 2; Steeustrup aud Liitkeu, op. 

 cit., PI. 11, fig. 22. 



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

 {Eulamia ohscura) on the south side of Long Island in 1870, differ only 

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

 above. 

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



Vineyard Sound, on Atwood's shark, [Carcharias 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. 



isOGACius Latreillii Leach. Plate VII, fig. 32. (p. 457.) 



Diet. des. Sci. uat., tome siv, p. 536, 1819, (teste Edwards et al. ;) Regue animal 

 de Cuvier, Crust., PI. 79, fig. 3 ; Hist. uat. des Crust., tome iii, p. 459 ; Steeu- 

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



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



All the species of Kofiof/us; are males of the allied genera, Pmidarus, 



