428 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



that depth of head at hind preopercle edge f its greatest width. 

 Also prominent ridge on each side of head above opercles. Upper 

 profile slightly convex at first, or to occiput, then concave to predorsal 

 ridge. Lower profile steeply convex. Snout wide, depressed or 

 but slightly convex, length about § its width. Eye small, high, 

 front edge near first fourth in head. Mouth vertical, commissure 

 extending slightly below lower eye edge. Upper jaw greatly pro- 

 tractile, or for space slightly greater than eye-diameter. Maxillary 

 vertical, extending back about half way to front of eye. Lips 

 fleshy. Lower jaw vertical, convex in profile, shallow, rami not 

 elevated inside mouth. Teeth small, simple, inconspicuous or 

 concealed more or less in fleshy lips, disposed as narrow short band 

 mostly in front of jaws. Tongue thick, fleshy, depressed, free 



Fig. 3. — Orestias cypho Fowler. 



around edges. Nostrils 2 little slits, close together, above and 

 opposite front edge of eye. Interorbital wide and slightly convex. 

 Hind ridge of preopercle slightly inclined back. Very slight median 

 concave depression on top of head before predorsal ridge. 



Gill-opening extends forward opposite middle of eye. Gill-rakers 

 about 10 short stumps, rudimentary. Gill-filaments slightly longer 

 than eye. Isthmus narrow, gill-membranes forming broad fold 

 across. Branchiostegals 5. 



Scales cycloid, largest on predorsal, becoming smaller on hind 

 part of body, caudal base and lower side of trunk. Prepectoral 

 region scaly. Scales on upper surface of head, predorsal and 

 shoulders finely granular, other scales finely roughened with concen- 

 tric stria?. Cheeks with 4 rows of scales, none below preorbital. 

 Scales down median line of predorsal not especially enlarged. Bases 



