16 BULLETIN 180, UNITED STATES NATIONAL MUSEUM 



115944, Rose Island, lagoon, June 12, 1939, 14 specimens, 125 to 302 mm. 



52297, Apia, Samoa, Jordan nnd Kellogg, 1 specimen. 



52271 (recorded as Dalophis longipinnis by Jordan and Seale), Apia, Samoa, 

 Jordan and Kellogg. The specimen in the jar numbered 52271 and identified 

 by Jordan and Seale as Dalophis longipinnis (Kner and Steindachner) actually 

 has the dorsal inserted a trifle behind the base of the pectoral fin instead of in 

 front of the gill openings. This, along with no teeth on the vomer and 

 those on the maxillary plain when examined microscopically, Indicates that 

 this 75-mm. specimen belongs to L. semlcinctus, even though it lacks all traces 

 of black spots. Perhaps it recently passed through the usual metamorphosis. 



Genus MACHAERENCHELYS Fowler 



Machaerenchelijs Fowler, Acad. Nat. Sci. Pliiladelphia, Monogr. 2, pt. 3, p. 85, 

 1937. (Type, M. vander'biiti Fowler.) 



This genus is intermediate between Lemranus and Oi?hichthys but 

 differs from the former in having about two conical teeth on the 

 vomer and from the latter genus by lacking a long irregular row, 

 sometimes biserial or triserial, of conical teeth on the vomer. 



The teeth on the maxillary and dentary are small and conical and 

 arranged in a single series, as in Leiuranus. In this genus the pec- 

 toral is developed, the dorsal begins nearly over the base of pectoral 

 fin; the snout projects much beyond the tip of lower jaw, the latter 

 not reaching to rear base of anterior tubular nostrils on under side 

 of snout; posterior nostrils below front of eye in upper lip and 

 directed downward. 



MACHAERENCHELYS PHOENIXENSIS, new species 



Plate 1 ; Figtjke 2c 



Holotype. — The only known specimen (U. S. N. M. No. 115940), 

 335 mm. in total length, was taken by Leonard P. Schultz in the 

 lagoon of Canton Island, among coral heads, on May 23-25, 1939. 



Description. — (Based on the holotype. Detailed measurements are 

 given in millimeters; these were converted into proportions in the 

 key on page 13). Total length 335; head 21; depth 7; tipe of snout 

 to anus 156; tip of snout to origin of dorsal 23.7; tip of snout to 

 rictus 6.2; snout 3.2; eye 25; end of dorsal fin to tip of tail 4.8; 

 length of pectoral fin 4.5; length of tail 179; width of interorbital 

 1.6; length of lower jaw 3.5; width of gill opening 1.7; length of 

 10th black bar 12 ; and length of 10th pale interspace 2.2 mm. There 

 are 28 black saddles or bars on head and body. 



Pectoral rays 12; about 156 pores along the lateral line behind 

 gill opening ; on top of snout in front of eye 2 pairs of pores, another 

 pair in interorbital space followed posteriorly by a median pore; 2 

 pores at rear margin of each eye; 2 below each eye and behind 

 posterior nostril; 1 pore in a line between anterior and posterior 



