462 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
27. COELORHYNCHUS NOTATUS Smith and Radcliffe. 
Coelorhynchus notatus SmMirH and Rapciirre, Proc. U. 8. Nat. Mus., vol. 
48, 1912, p. 136 (type-specimen only), pl. 30, fig. 3. 
For the purpose of presenting a full comparison with the several 
closely related species which we are now describing, we have prepared 
a detailed description of this species. 
Type-specimen.—Cat. No. 72948, U.S.N.M., is the only repre- 
sentative of this species in the collection. It is a mature female, 
measuring 268 mm. in total length to the broken tip of the tail, and 
84 mm. to the center of the anus. These measurements indicate that 
CO. notatus is probably a larger species than any of the closely related 
forms with the exception of @. velifer. The type was dredged at 
Albatross station 5162, in Alice Channel, which connects Sulu Sea 
with Celebes Sea; depth, 230 fathoms; bottom temperature, 52.9° F. 
Dorsal rays, II, 9; pectoral, 17 (including the uppermost spine) ; 
ventral, 7. 
Greatest depth of the body, 1.7 in head; width over pectoral bases, 
2.25 in head, less than the depth below the origin of the lateral line. 
The concavity of the dorsal contour of the snout is well shown in the 
type figure; the lateral margins of the snout are much less strongly 
convex than in maculatus or velifer; they converge rather rapidly 
forward. The tip of the snout is sharper than in C. maculatus or 
velifer, but somewhat blunter than in the other closely related 
species; the snout near its tip is wider than deep; the terminal plate 
projects but little beyond the general contour of the snout. The 
preocular length of the snout is contained 2.71 times in the length 
of the head (63 mm.) ; the preoral length, 3.00 times; width of snout 
opposite front of orbits, 2.70 times. The posteroventral angle of 
the subopercle is produced backward as a rather bluntly pointed flap. 
Length of the orbit, 3.40 in head, 1.15 in postorbital length of the 
head, 1.28 in snout. The least interorbital width, above the front of 
the pupils, is contained 1.75 times in the postorbital; least sub- 
orbital width, 2.60 times. The length of the upper jaw is contained 
3.75 times in the head; the maxillary subtends the anterior two-thirds 
of the orbital length. The outer premaxillary series of teeth is 
scarcely enlarged. Length of the barbel, 3.40 in postorbital. Branch- 
iostegal rays, 6. A narrow free fold is formed on the median line 
behind the attachment of the gill-membranes. 
The anus is remote from the anal fin, the interspace being con- 
tained 1.6 times in the distance from the anus to the base of the outer 
ventral ray, a distance which is slightly shorter than the orbit. The 
interval between the isthmus and the base of the ventral fin is con- 
tained 1.07 times in the postorbital, and is 1.1 times as long as the 
distance from the ventral base to the isthmus. 
