FISHES OF FAMILY GRAMMICOLEPIDAE — MYERS 



149 



QBAMMICOLEPIS 



1. Scaly part of gular membrane not 

 covering the blunt lower angle of 

 the hyoid apparatus (urohyal), 

 which is protected only by thin 

 skin. 



2. All 7 of the branchiostegal rays 

 lacking a cover of muscle and 

 easily seen without dissection. 



3. Upper anterior angle of the pre- 



ventral profile (covering the an- 

 terior horn of the cleitlirum), at 

 gill slit, directly below the middle 

 or anterior border of the pupil of 

 the eye. 



4. First anal spine shorter than eye in 



half grown and adult. 



5. Tip of lower jaw, with mouth closed, 



opposite upper border of pupil. 



6. Upper border of head above eye (at 



junction with scales of nape) 

 sloping downward sharply behind. 



7. Interopercle plainly visible beneath 



lower limb of preopercle; scaled. 



8. Body deep when young (depth al- 



most equal to length minus caudal 

 peduncle in a 75 mm specimen), 

 growing more elongate with age. 



9. Anterior portion of lateral line in 



a high, peaked curve In half 

 grown, flattening out into an ir- 

 regular, low curve with age. 



10. Ends of dorsal and anal bases al- 



most opposite in half grown, the 

 end of the dorsal becoming de- 

 cidedly more anterior with age. 



11. Anterior part of nape concave 



(possibly becoming straight or 

 convex in old age). 



XENOLE3PIDICHTHYS 



1. Scaly part of gular membrane 



nearly or quite covering the blunt 

 lower angle of the hyoid apparatus 

 (urohyal), which is protected not 

 only by the scaly membrane but 

 also by a thick layer of muscle 

 under the latter. 



2. The first 3 of the 7 branchiostegal 



rays thickly covered by a sheet of 

 muscle running to the lower pos- 

 terior limb of the ceratohyal, and 

 not visible without dissection of 

 this muscle. 



3. Upper anterior angle of the pre- 



ventral profile (covering the an- 

 terior horn of the clei thrum), at 

 gill slit, anterior to the vertical 

 of the front border of the orbit. 



4. First anal spine nearly equal to or 



exceeding length of head at all 

 ages. 



5. Tip of lower jaw, with mouth 



closed, opposite middle or lower 

 border of pupil. 



6. Upper border of head above eye (at 



junction with scales of nape) 

 sloping downward only slightly. 

 7 Interopercle mostly hidden under 

 preopercle. 



8. Body very deep at all ages, the 



depth nearly equal to or greater 

 than the length minus caudal 

 peduncle. 



9. Anterior portion of lateral line in 



a high, peaked curve at all ages. 



10. Ends of dorsal and anal bases 

 practically opposite at all ages. 



11. Anterior part of nape flat or con- 

 vex at all ages. 



