496 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
generated on an area where the scales had previously been lost by 
injury. In a former paper the authors described? in detail the 
occurrence, in Coryphaenoides (Nematonurus) pectoralis, 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 les 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 
1Proc. U. S. Nat. Mus., vol. 51, 1916, pp. 161-162. 
