330 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



aa. Preopercio serrate; anal rays III, 8; furrow for premaxillary processes naked, 

 broad ; teeth very small. 



e. Preorbital entire; body without dark lengthwise stripes. 



/. Body ovate, the outlines somewhat regularly elliptical, the depth a little 

 less than half length ; spines rather slender and short ; second dorsal 

 spine half length of head, one-fourth longer than second anal spine, 

 which is less than half length of head Aueeolus. 



ff. Body rhomboid, short and deep, with angular outlines, the depth usually 

 rather more than half length; spines long and strong ; second dorsal spine 

 about as long as head, about half longer than the strong second anal 



spine, which is more than half length of head Peruviaxus.* 



ee. Preorbital serrate ; body with distinct dark stripes along the rows of 

 scales ; body rhomboidal, with angular outline, the depth a little less than 

 half length; spines very strong, the second dorsal spine two-thirds to 

 three-fourths length of head, about half longer than second anal spine. 



/. Pectoral long, reaching about to front of anal ; caudal longer than head ; 

 lateral stripes numerous Lineatus.I 



ff. Pectoral short, barely reaching vent ; caudal shorter than head ; lateral 

 stripes few BREViMANUS.t 



16. Gobius emblematicus, sp. nov. 



Body rather elongate, compressed, heaviest forwards, tapering regu- 

 larly from the occi])ut to the caudal fin. Snout short, rather broad, 

 acute in profile ; mouth terminal, very oblique ; gape wide, its length 

 nearly half length of head ; maxillary reaching to opposite middle of 

 jjupil ; premaxillaries in front on the leyel of the pupil. Tip of lower 

 jaw j)rotruding beyond the upper. 



Teeth in the upper jaw forming a single row, in the lower jaw partly 

 in two series in front, forming a single row laterally; the anterior teeth 

 in both jaws strong, incurved, and almost canine-like, the lateral teeth 

 smaller and more closely set. Vomer and palatines toothless. Tongue 

 emarginate in front. 



Eyes very large, placed high, close together, the interorbital space 

 extremely narrow, scarcely one-fourth the diameter of the orbit, which 

 is greater than the length of the snout and scarcely less than one-third 

 the length of head. Gill-opening moderate, extending from upper angle 

 of opercle to below level of lower edge of pectoral fin. 



Scales extremely small, cycloid, scarcely increasing in size toward 

 caudal peduncle; head and anterior part of body to front of dorsal fin 

 naked; a narrow naked strii) along base of anterior half of spinous 

 dorsal. 



Dorsal spines very slender and weak, some of the middle ones nsually 

 Ijrolonged, sometimes reaching nearly to the base of caudal, sometimes 



* Gerres i^eruvianus Cuv. & V. vi, 467, 1830: Gerres rhoinbcus Gthr. Fish. Ceutr. Amer. 

 1866, 391 (not of C. & V.?). Mazatlan (GUb.); Chiapam (Gi/;?-,) ; Fanama {GiJb.)  

 Peru(C'. # r.). 



\ Smaris lineatus Humboldt, Observ. Zoolog. ii. 185, pi. 46: Gerres axillaris Giinther, 

 Proc. Zool. Soc. Loud. 18G4, 102. Mazatlan (Gilb.) ; San Bias (Nichols coll.); Acapulco 

 (Humboldt) ; Chiapam (Gthr.). 



t Gerres brevimanus Giinther, Proc. Zool. Soc. Lond. 1864, 152. Chiai)am (Gthr.). 



