1905.] NATURAL SCIENCES OF PHILADELPHIA. 61 



trcmity equal to about f of pupil, much inclined and reaching well 

 beyond posterior margin of orbit. Teeth small, strong, somewhat 

 slender, pointed, uniserial in upper jaw^ and biserial in lower. Outer 

 series of mandible directed somewhat outward so that those of upper 

 fit in between. Patches of minute teeth on vomer and palatines, none 

 on pterygoids. Patch on vomer more or less rounded in shape and 

 Tvdthout backward prolongation like that in 0. sauriis. Palatine teeth 

 in form of broader patches anteriorly, becoming very narrow poste- 

 riorly. Tongue small, broad, rounded, and free in front, its upper 

 surface asperous. Surfaces of basibranchials also asperous. Nostrils 

 adjoining, nearly opposite middle of eye, and also a little nearer same 

 than tip of snout. Posterior a little larger and partly concealed in 

 front by a small flap along edge of anterior. Interorbital space elevated 

 convexly, and with a median trenchant k(>el extending from internasal 

 space to occiput. Region before spinous dorsal also trenchant. 



Gill-opening extending forward about opposit^^ nostrils. Rakers 

 about 7+16, slender, and longest a trifle shorter than filaments which 

 arc nearly equal to | of orbit. Pseud obranchi^e small. Isthmus 

 strongly compressed but edge rounded. 



Scales elongate, slender, pointed, and irregularly directed backward. 

 Lateral line curved or wavy at first, becoming somewhat straight along 

 side of trunk opposite rayed dorsal and anal. An axillary ca^dty at 

 base of pectoral covered over above by a membrane. A similar one at 

 base of ventral. Each spine of dorsal and anal depressible in a deep 

 groove. Head entirely naked. 



First dorsal spine directed forward, its tip about opposite middle of 

 pectoral. Dorsal spines separate, each one posteriorly united with 

 back by a membrane, and all graduated to last which is longest. Soft 

 dorsal inserted well behind origin of soft anal, nearly midway between 

 front margin of orbit and base of last dorsal ray. Anterior rays elon- 

 gate, forming a small lobe, and about last ten finlet-like though united 

 by a membrane. Soft anal similar, inserted about midway between 

 tip of mandible and base of last anal ray. Spinous anal inserted about 

 opposite tip of pectoral, spines nearly equal, united posteriorly with 

 abdomen by a low membrane, also depressible in a groove, and not 

 quite reaching origin of anal when depressed. Caudal moderate, 

 deeply forked, and lobes somewhat slender. Pectoral short, broad, 

 and its insertion nearly level above with lower rim of orbit. Ventral 

 inserted a trifle in advance, inner ray joined to abdomen by a membrane, 

 and depressed fin reaching a little over half way to origin of spinous 

 anal. Ventral spine about half length of fin. Anus a little nearer tip 

 of depressed ventral than origin of spinous anal. 



