664 FROCEEDimiS OF THE NATIONAL MWEUM. vol. xxxiii. 



A KEY TO GENERA » OF FAMILY CEPHALACANTHID^. 



a. Lateral line wanting. 



b. Occiput without elongate ray-like free spine; continuous spinous dorsal pre- 

 ceded by two semi-paired rays, which fold backward on either side of the fin. 



Cephalacanthus (Atlantic species) 

 bh. Occiput with an elongate ray-like free spine, 

 c. A detached finlet of one spine, between elongate spine at occiput and the spi- 

 nous dorsal proper Dactyloptena, 12 



cc. No detached finlet in front of spinous dorsal and behind occipital spine. 



Daicocus, 13 

 aa. Lateral line developed; occipital spine and detached dorsal finlet present. 



Ebisinus (Species East Indian) 



« In view of the introduction of new generic distinctions in this paper, we here 

 include reference to all the known genera and species of this interesting family. 



CEPHALACANTHUS Lacepede. 



Cephalacanthus Lacepede, Hist. Nat. Poiss, VI, 1802, p. 5 {spinarella=volitans) . 

 Dactylopterus L.4cepede, Hist. Nat. Poiss, VI, 1802, p. 8 (pirapeda^=volitans) . 

 Cep/iacanrKa Rafinesque, Anal. deNat., 1815, p. 85 (substitute for Cephalacanthus). 

 Head with its upper surface and sides entirely bony; the scapular shield and- the 

 angle of the preoperculum produced backward as long spine-like processes; body cov- 

 ered with scales, those on the sides and back strongly keeled; lateral line absent; two 

 dorsal fins, the lirst two rays of the spinous dorsal nearly detached and inserted paired- 

 wise in front of the first true spine so that they may be folded backward one on each 

 side of the fin; pectoral fins very long; no ray-like filament on occiput. 

 {KecpcxX?} head] cxKai^Oa, a spine). 

 Atlantic and neigliboring seas; one species known. 



CEPHALACANTHUS VOLITANS (Linnaeus). 



Trigla volitans Linn.eus, Syst. Nat., 10th ed., 1, 1758, p. 296 ("Mari Mediterraneo 

 Oceanio, Pelago inter tropicos, in Asia ad Cap. b. Spei"). — Cuvier and Val- 

 enciennes, Hist. Nat. Poiss., IV, 1829, p. 138. . 



Gasterosteus spinarella Linn^us, Syst. Nat., 10th ed., X, Pt. 1, 1758, p. 297 

 ("habitat India" error in locality; should be Surinam. See Cuvier and 

 Valenciennes, IV, p. 138). 



Cephalacanthus spinarella Lacepede, Hist. Nat. Poiss., VI, 1802, p. 5. — Cuvier 

 and Valenciennes, Hist. Nat. Poiss., IV, 1829, p. 138, pi. lxxvii. — Stein- 

 DACHNER, Ichth. Span. u. Portugal, IV, 1867, pp. 91-92, pi. ii, fig. 2; pi. iv, 

 fig. 2.— LuTKEN, Spol. Atl., Fiske, 1880, pp. 417-428 and 590-591, pi. i, figs. 1-5 



Dactylopterus pirapeda Lacepede, Hist. Nat. Poiss., VI, 1802, p. 8. 



Dactylopterus volitans Gijnther, Cat. Fishes, II, 1860, p. 221. 



Cephalacanthus volitans Jordan and Evermann, Bull. U. S. Nat. Mus., No. 47, 

 II, 1898, p. 2183, pi. cccxxiii, fig. 778. 

 Atlantic Ocean and Mediterranean. 



EBISINUS Jordan and Richardson, new genus. 



Ebisinus Jordan and Richardson, new genus of Cephalacanthidse {cheirophthal- 

 mus). 

 This genus differs from Cephalacanthus, Dactyloptena, and Daicocus in the presence 

 of a well-developed lateral line. The spinous dorsal is preceded by a single detached 



