764 PROCEEDINGS OF THE ACADEMY OF [NoV., 



others. The scales above the base of the pectoral are much larger, 

 and those directly above in the corselet are on the contrary indicated 

 as smaller. 



I adopt Gmelin's original spelling as there is no evidence that it is 

 an imintentional error, though of course incorrect. 



Subgenus SCOMBEROMORUS Lac^pfede. 



Gill-rakers 8 to 12 on first arch below angle. Dorsal spines XVII or 

 XVIII. Teeth 30 to 40 in each jaw. Lateral line somewhat wavy 

 and descending obliquely. 

 Soomberomorus argyreus sp. nov. Plate LI, lower figure. 



Head 4; depth 4|; D. XVII-iii, 13, 8; A. v, 13,8; P.i,20; V. i, 5; 

 width of head 2f in its length; depth of head If; snout 3; orbit 4^; 

 maxillary If; mandible If; interorbital space 3f ; fourth dorsal spine 

 2|; third simple dorsal ray 2^; height of anal fin (damaged) 2^; least 

 depth of caudal peduncle 4|. 



Body apparently compressed, rather deep, profiles similar, and great- 

 est depth between origins of soft dorsal and anal. From this point 

 back tail well compressed, especially small caudal peduncle. Latter 

 with depth about | of its length, measured to end of last vertebra. 



Head a little small, compressed apparently, and triangular anteriorly 

 in profile. Snout sharply conic, equal to about 1^ eye-diameters. In 

 front this is formed by broad maxillaries which project well forward 

 to form pointed tip of snout. Eye circular, a little high, and a little 

 anterior. Mouth large and mandible even with tip of snout in front. 

 Maxillary extending posteriorly till opposite posterior rim of orbit, slip- 

 ping below orbital rim for good portion of its length, and width of 

 distal extremity f of diameter of pupil. Teeth compressed, 2qEi9 ii^ 

 jaws. Tongue rather broad, obtuse, thick, small, and a little free in 

 front. Patches of very minute teeth on vomer, palatines, and ptery- 

 goids. Tongue almost perfectly smooth, but surfaces of branchial 

 bones in pharynx finely asperous. Nostrils distinct, well separated. 

 Anterior circular, and a little less than diameter of pupil from front of 

 eye. Posterior a vertical slit close in front of eye, also a little less in 

 length than half of pupil. Interorbital space broad, and elevated 

 convexly a little. Margin of opercle rounded posteriorly, hardly form- 

 ing a blunt angle. 



Gill-opening extending far forward till opposite anterior nostril. 

 Rakers small, i, 3-hl2, longest | length of longest filament, rather far 

 apart and not sharp. Longest filaments about i of orbit. Pseudo- 

 branchiae well developed, though a little smaller. Isthmus long, sharp, 

 and trenchant. 



