316 PROCEEDINGS OF THE ACADEMY OF [1884. 



II. LEIRUS. 

 Leirus Lowe, " Proo. Zool. Soc, London," 1839, 82 {betmetii = ovalis). 

 Falinnrus Dekay, New York Fauna, Fish, 118, 1842 {perci/ormis). 

 Criu8 Valenciennes, "Webb and Berthelot, Isles Canar. Poiss." (bennetti). 

 Fammelas GUnther, Cat. Fish. Brit. Mus., ii, 485, 1860 {perci/ormu). 

 Palinuriohtbys Gill, Proc. Acad. Nat. Sci. Phila., 1860,20 (perei/ormis). 

 Falimirichthys Bleeker, about 1860 {perdformis). 



Analysis of American Species of Leirus. 



a. Body ovate ; the greatest depth, 2^ in length. Head, 3^ ; D. 

 YIII, 20 ; A. Ill, 16 ; Lat. 1. 15. perdformis. 1, 



aa. Body more elongate, its greatest depth 3^ in length. Head, 

 3; D. VIII-IX, 26-28; A. Ill, 18; Lat. 1. 80-90. 



peruanus. 2. 



I follow Jordan and Gilbert in regarding Leirus as a genus 

 distinct from Centrolophus, from which it differs chiefly in the 

 differentiation of the dorsal spines, and in referring to Leirus, 

 the Palinurichthys perdformis of American writers, which 

 appears to be a near relative of Leirus ovalis, although Dr. 

 Giinther has placed it among the Garangidse. 



1. Leirus peroiformis. 



Rudder fish or PercJi eoryphene Mitchill, Lit. Phil. Soc, i, pi. vi, f. 7, 



1814 (no description). 

 Coryphene perdformis Mitcliill, Am. Month. Mag., ii, 244, 1818 



(New York Harbor). 

 Palinurus perdformis Dekay, New York Fauna, Fish, 118, pi. xxiv, 



f. 25, 1842 (Shrewsbury Inlet). 

 Pammelas perdformis Giinther, Cat. Fish. Brit. Mus., ii, 485, 1860 



(Coast of New York). 

 Palinurichthys perdformis Gill, Proc. Phila. Acad. Nat. Sci., 1860, 



20 (name only); Bean, Proc. U. S. Nat. Mus., 1880, 91 (Wood's 



HoU, Mass. ; Ofif Noman's Land ; New York Market ; Newport, 



R. I. ; Gloucester, Mass. ; Fishing banks, off coast of Maine). 

 Lirus perdformis .Jordan and Gilbert. Syn. Fish. N. A., 452, 1882. 

 Trachinotus argenteus Storer, Mass. Rep., 55, 1839 (Holme's HoU, 



Mass. ; not of Cuvier and Valenciennes). 



Habitat. — Maine to New York. 



This species has apparently but a limited range on our Atlantic 

 coast. It is apparently congeneric with Centrolophus ovalis 

 Cuv. and Val., the type of Lowe's genus Leirus. 



