AGO^TD^. — LXXIT. 151 



depth 6. D. YII-18. A. 15. Y.I. 3. L. 3. Deep waters of 

 L. ^Michigan and L. Ontario. (To Rev. Zadock Thompson, author 

 of Xat. Hist, of Vermont.^ 



191. TRIGLOPS Reinhardt. (rptyXo, Trigla : af, appearance.) 



419. T. pingeli Reinhardt. Head slender; eve large; tail Tcry 

 slender ; preopercular spines small, simple ; sides with peculiar 

 scales and prickles. Olivaceous, variegated with darker: sides 

 spotted with dark ; a black ocellus on spinous D. Head 3^ : depth 

 about 5^. D. IX-21. A. 21. L. 5. Arctic seas, S. to Cape Cod- 



192. GYMNACANTHUS .Swainson. (yu/uw, naked ; 

 axavda, spine.) 



420. G. tricuspis (Reinhardt). Eye very large ; skin mostly 

 smooth ; preopercular spine broad, shorter than eye. with 3 

 points ; Y. ver^- long. Dark brown with darker bars ; axils dusky 

 in (J with round white spots. Head 31 : depth 4|. D. XTT-lfi, 

 A. 18. Y. L 3. L. 12. Arctic, S. to Me. {Eu.) (Lat., tris, 

 three ; cuspis, cusp.) 



Family LXXIY. AGOXID^. (The Aixigator-fishes.) 



Fishes allied to the Coiii'ue and similar in general structure, but 

 with the body completely covered by a coat of mail composed of 

 about eight series of large bony plates : head entirely bony exter- 

 nally ; suborbital stay covering the cheek : gills 3^. no slit behind 

 the last, pseudobranchias large. Yertebrae (as in other Arctic 

 fishes) numerous. 35 to 40. Spinous dorsal sometimes wanting. 

 Small fishes, chiefly of the Arctic seas : genera 10, species a'oout 

 20. (a, privative ; ywvia. joint ; i. e., rigid.) 



a. Spinoas doiral obsolete ; gill membranes free from isthmns. (Aqndcpho- 

 rmdiiUE.) 

 b. Bony plates teeled, without spines: fins very small: teeth on vomer. 



ASPrUOPHOEOIDES, 193. 



193. ASPIDOPHOROIDES Lacepede. (dtnris, shield; ^pe'», 



to bear : elbos. form.) 

 a. Snout with two large diverging spines above; no other spmes present. 



421. A. monopterygius (Bloch). Body elongate, subterete. re- 

 sembling that of a pipe-lish : eyes very large. Brownish, obscurelv 

 banded. Head 5|; depth 9. D. 5. A. 6. Lat. 1. 50. L. 6. Cape 

 Cod, X. {fiovos, single : irrepv^. fin.) 



Familt LXXY. CEPHALACAXTHID^. 

 (The Flying Gurnards.) 



Body elongate, with bony keeled scales : head blunt, cuboid, its 

 surface almost entirely bony ; nuchal shield with a strong spine on 



