70. ECHENEIDID^ KHOMBOCHIRUS. 
417 
Maxillary barely reaching vertical from nostril. Head in length; 
disk 3| ; width between j^ectorals about 7^. D. XXI-XXV — 32-41 ; 
A. 34 (32-38). In all warm seas, north to Cape Cod and San Francisco. 
(Liuu. Syst. Nat. ; Guutlier, ii, 384 : Leptecheneis nauerates Gill, Proc. Acad. Nat. 
Sci. Pliila. 1864, 60. EcJieneis naucrateoides Zuienw, Nova. Acta. Acad. Sci. Imp. Petro- 
pol. iv, ‘279, Leptecheneis naucrateoides Gill, Proc. Acad. Nat. Sci. Phila. 1864, 61, Ech- 
eneis albicauda Mitcli. Amer. Monthly Mag. ii, 244. Echeneis lineata Holbr. Ichth S. C. 
1860, 102, and Echeneis holhrooki, Giinther, ii, 382, are names applied to specimens with 
the disk comparatively long, hut with only 21 laminae.) 
aa. Body rather robust; vertebrae 12 + 15. (Eemora* Gill.) 
b. Dorsal rays about XVIII-23. 
65§. E. remora L. — Remora. 
Uniform dark brown. Body and tail comparatively robust, the latter 
compressed. Pectoral fins rounded, short, and broad, their rays soft 
and flexible; ventral fins adnate to the abdomen for more than half 
the length of their inner edge. Tip of lower jaw not produced into a 
flap. Vertebr® 12 + 15. Head broad, depressed Disk longer than 
the dorsal or anal fin. Maxillary scarcely reaching front of orbit. 
Caudal lunate; vertical fins rather high; pectoral f length of head. 
Head 4; disk 2f; width between iiectorals 5+ D. XYIII — 23; A. 25. 
Warm seas, north to Xew York and San Francisco, usually found at- 
tached to large sharks. 
{Echeneis remora L. Syst. Nat. : Echeneis jacoboea Lowe, Proc. Zook Soc. London, 1839, 
89: Echeneis remora Giinther, ii, 378: Remora jacoboea Gill, Proc. Acad. Nat. Sci. Phila. 
1862, 239.) 
aa. Dorsal rays about XVI-30. {Remoropsis Gill.) 
659. E. I>ra.cliyptcra Lowe. 
Light brown, darker below; fins paler; body robust, the greatest 
depth nearly twice the length of the short iiectoral fins; disk shorter 
than base of dorsal, rather broad; upjier jaw angular. Caudal nearly 
truncate. Head nearly 4; width between pectorals G+ D. XVI — 30; 
A. 26. Warm seas, north to Massachusetts. 
{Echeneis brachyptera Lowe, Proc. Zool. Soc. Lond. 1839, 89: Echeneis quatuordecemlam- 
inabis Storer, Hist. Fish. Mass. 406: Echeneis brachyptera Giinther, ii, 378: Remoropsis 
brachypterus Gill, Proc. Acad. Nat. Sci. Phila. 1864, 60.) 
2©l'.-RHOMBOCHaKi;S Gill. 
(Gill, Proc. Acad. Nat. Sci. Phila. 1863, 88: tyjie Echeneis osieochir Cuv.) 
This genus agrees with Eeniora in every respect excepting the struc* 
ture of the iiectoral fins. These are short and broad, rhombic in outline, 
*Gill. Proc. Acad. Nat. Sci. Phila. 1862, 239: type Echeneis remora L. {Remora, an 
ancient name, “holding back.”) 
Bull. Xat. Mus. Xo. 16 27 
