12 PROCEEDINGS OF THE ACADEMY OF [Jan., 



dorsal. This replaced by siinilar parallel keel beginning little below 

 opposite dorsal origin and continued to end of tail. Median lateral 

 keel from pectoral axil, slopes clown beliind close to lower body keel, 

 and ends opposite beginning of hind section of upper keel along 

 back. Median keel on belly complete from breast to vent. Lower 

 keel along each side of body from head to caudal base, and not 

 interrupted. 



Head short, compressed, and upper profile concave. Snout little 

 longer than postocular region, profile concave. Eye circular, rather 

 small, supraorbital keel moderate. Mouth terminally superior, 

 small. Maxillary short, about half of eye. Interorbital concave. 

 Opercle with well-developed horizontal keel, and fine striae radiate 

 above and below. Slight mecUan keel on snout above occiput, and 

 then continued back obsoletely to dorsal, each one being broken at 

 segment junctures. 



Gill-opening small superior oblique slit about its own length above 

 pectoral origin, 1| in eye. 



Fig. 5. — Corythroichthys matterni sp. nov. 



Rings all firm, and keels without spines. Each ring with numerous 

 transverse striae. 



Dorsal origin slightly behind vent and beginning of second section 

 of upper lateral keel, and extends over 6 abdominal rings. Anal 

 very small, about long as pupil, insertion near last third of ring 

 before dorsal origin. Caudal small, oblong, median rays longest. 

 Pectoral broad basally, long as eye. 



Color faded dull brownish in alcohol, ground-color uniform, 

 speckled and finely dotted minutely and irregularly with deeper or 

 darker brown to burnt umber. Side of head with brownish dots 

 and bars, especially on opercle below. Eye crossed by several deep 

 brown radiating bars. Broad deep brown streak from eye along 

 side of snout. From beliind each eye obliquely down below deep 

 brown bar, but not united on lower surface of head. Fins all plain 

 and unmarked. Iris pale slaty. 



Length 138 mm. 



Type, No. 47,484, A. N. S. P. 



Philippine Islands. Presented by the Commercial Museums of 

 Philadelphia. 



