2268 Bulletin 47, ' United States National Museum. 



value of its peculiarities, it is certain that it is not allied to EJacate any 

 more than to others of the hosts of Scombroid, Percoid, and kindred fishes, 

 and that it differs in toto from it, notwithstanding the claims that have 

 been made otherwise. It is true that there is a striking resemblance, 

 especially between the young— almost as great, for example, as that 

 between the placental mouse and the marsupial An fechhiomys— hut the 

 like is entirely superficial, and the scientific ichthyologist should be no 

 more misled in the case than would the scientific therologist by the 

 likeness of the marsupial and placental mammals." 



a. Body very slender, the vertebra; 14 + 16 — 30; ventrals narrowly adnate to abdomen; 

 lower jaw produced in a flap ; pectorals acute, with flexible rays. 

 h. Lamina- 10 only. Phtheirichthys, 833. 



bb. Lamina- 20 to 28. Echeneis, 834. 



aa. Body rather robust, the vertebra- 12+ 15=27; ventrals broadly adnate to abdomen; 

 lower jaw not produced; pectorals rounded. 

 c. Laminas 24 to 27. Eemilegia, 835. 



cc. Lamina3 16 to 20. 



d. Pectoral rays soft and fle.xible. Remora, 835. 



dd. Pectoral rays stifl'and ossified. Khombochieus, 837. 



833. PHTHEIRICHTHYS, Gill. 



Phtheirichthyt, Gill, Proc. Ac. Nat. Sci. Phila. 1862, 239 (lineata) . 



Disk -with 10 lamina' ; palatines with sharp teeth ; teeth in pairs, uniform 

 in all ages; otherwise as in Echeneis. A single species, found attached to 

 spearfishes and Barracudas. (ipQsip, a louse; Ix^vi, fish.) 



2G02. PHTHEIRICHTHYS LINEATUS (Meuzies). 



Head 5; disk twice as long as broad, its length 4i in body. D. X-33; A. 

 33. Lower jaw very narrow, much projecting. Body blackish, with 2 

 whitish lateral bauds; all the fins white-margined. Tropical seas, rang- 

 ing north to South Carolina and Pensacola ; rather i-are. {lineatus, striped. ) 



Echeneis lineata, Menzies, Trans. Linn. Soc. London, i, 1791, 187, pi. 17, fig. 1, Pacific Ocean 



between the tropics ; GCnther, Cat., n, 382, 1800. 

 Echeneis tropica, Euphrasen, Nya Handl., xn, 317, 1791, Atlantic between the Tropics. 

 Echeneis apicalis, Poev, ISIemorias, 11, 254, 1861, Cuba. (Coll. Poey.) 



Echeneis spihyrcenarwn, Poey, Memorias, 11, 255, 1861, Cuba, on I>an-acudas. (Coll. Poey.) 

 Phtheirichthys lineatus, Jordan & GU.BEKT, Synoi)sis, 969, 18S3. 



834. ECHENEIS (Artedi) Linnieus. 



Echeneis (Arted:) Linnaeus, Syst. Nat., Ed. x, 260, 1758 (naucrates). 



Leptecheneis, Gill, Proc. Ac. N.it. Sci. Phila. 1864, 60 (nauci-ates) ; the name Echeneis being 

 transferred to E. remora, the only species known to Artedi. 



Body comparatively elongate, the vcrtebraj 14 -[-16 = 30; disk long, of 

 20 to 28 laminjy; pectoral pointed, its rays soft and flexible; soft dorsal 

 and anal long, of 30 to 41 rays each ; caudal lunate in the adult, convex in 

 the young. Species of wide distribution, attaching themselves mainly to 

 sea turtles and large fishes. {£X^''^f?'i) an ancient name, from e'xoo, to 

 hold back; vav^, a ship.) 



