406 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



generated on an area where the scales had previous^ been lost by 

 injury. In a former paper the authors described 1 in detail the 

 occurrence, in Coryphaenoides {N ematonurus) fectoralis, of areas of 

 scales bearing an increased number of parallel rows of spinules. On 

 reexamination we find that these scales, too, are thinner than the 

 normal ones and that they lack striae, except near their margins; it 

 is evident, then, that these scales also are regenerated ; this explana- 

 tion accounts for the peculiarly inconstant location of the groups of 

 such scales. 



The terminal rostral plate ends in a long, sharply acuminate, 

 spine-like tip, behind which the plate is covered by several long, 

 straight rows of small spinules; the following scales of the infra- 

 orbital ridge are closely set with rather strong spinules; these scales 

 are in two series behind middle of eye — that is, on the suborbital and 

 preopercular portions of the ridge; the infraorbital ridge ends 

 sharply a short distance before the preopercular margin, the inter- 

 space enterring about 8 (7 to 9) times into the length of the post- 

 orbital region of head. The scales below the orbit, in an area ex- 

 tending forward to the nasal fossa and backward to the preopercular 

 ridge, although small, are armed by several series of spinules directed 

 downward and backward. The 8 (to 11) subquadrate scales cover- 

 ing the median superior rostral ridge bear numerous series of spin- 

 ules radiating from near the center of each ; similar scales cover the 

 supranarial and the anterior half of the supraorbital ridges; the 

 posterior half of the supraorbital ridge and the occipital and post- 

 orbital ridges are prominent, bearing elongate scales strongly armed 

 by a single (or a few) series of strong spinules directed backward. 

 The scales on the top of the head and on its posterior sides are little 

 reduced in size, bearing several series of high, trenchant spinules; 

 about five series occupy the space between the occipital ridges; a 

 median enlarged series lies between the occipital and postorbital 

 ridges, in advance of the lateral line. The median occipital scute 

 bears 3 (to 5 in large specimens) spinous carinae; it is usually pre- 

 ceded on each side by a similar scute; a scute with a strong median 

 keel is located just above the origin of the lateral line. The scales 

 on the anterolateral region of the snout are small, bear a few tren- 

 chant carinae, and are separated by a narrow groove from the series 

 of scales bounding the median rostral series. The lower half of the 

 nasal fossa is scaled. The under side of the head, including the 

 rami of the mandibles, is covered with very small scales, most of 

 which bear a few spinous carinae directed backward. 



Length of first dorsal base, 1.7 (to 1.4) in interdorsal space and 

 1.9 (1.8 to 2.25) in postorbital length of head. Length of fin-rays 



1 Proc. U. S. Nat. Mus., vol. 51, 1916, pp. 161-162. 



