174 BULLETIN 30, UNITED STATES NATIONAL MUSEUM. 



tlie part of tbe ramus wliicb iiniuedia-tely succeeds it; aveolar border 

 flat. 



Measurements of the sl-idl. — (Britisb Museum, 359«. L. eleetra, Tjpe.) 

 Total leugtb, 45.7""; lengtb of rostrum, 24.35""; breadtb of rostrum at 

 base, 13.95""; at its middle, 9.2""; breadtb of iutermaxilbe at same 

 point, 0.1""; breadtb between orbits, 25.2""; lengtb of temporal fossa, 

 9.4"" ; deptb of temporal fossa, 5.5"" . 



Habitat. — Indian Ocean; tropical Pacific Ocean; Hawaii. 



LAGENORHYNCIIUS OBSCURUS (Gray). 

 (Plate 2D, figs. 1 aud 2.) 



Form apparently like tbat of L. aeutus, but tbe snout longer and 

 narrower and not distinctly divided oft" from tbe bead. 



"Fins moderate and falcate; neck and belly wbite ; a black band 

 from tbe angle of tbe moutb to tbe pectoral fins; lateral oblique streaks 

 of wbite; otberwise entirely black" (Gray). 



Teetb, |=. Skull similar to tbat of X. ohUqiiidens, but smaller. Pter^'- 

 goid bones in contact in tbe median line. Iutermaxilbe broad proxi- 

 mally, more or less convex distally ; outer margins straigbt. Lengtb 

 of rostrum sligbtly exceeding one balf tbe total lengtb of tbe skull. 

 Temporal fossi^e moderate, elliptical ; tbeir lengtb always exceeding tbe 

 widtli of tbe beak at tbe middle. 



Measurements of the exterior.— (Britmh. Museum, type skin, 41, 1733).* 

 Total lengtb, 65 incbes (1G5.1"") ; extremity of snout to corner of moutb, 

 S.7 incbes (22.1'"') ; to base of pectoral fin, 1G.5 incbes (41.9'""') ; to base 

 of dorsal fin, 31.75 incbes (80.6*^'") ; vertical beigbt of dorsal fin, 7.5 incbes 

 (19"''); lengtb of pectoral fin, 11 incbes (27.9""); breadtb of flukes, 

 15.75 incbes (40'"'). 



Measurements of the 67.i<ZL— (Britisb Museum, 354 a.) Total lengtb, 

 3G.8"'; lengtb of rostrum, 20.1""; breadtb of rostrum at base, 9.3""; at 

 its middle, G.l""; breadtb of iutermaxilbe at same point, 3.3""; breadtb 

 between orbits, 15.5""; lengtb of temporal fossa, G.7"" ; deptb of tem- 

 poral fossa, 4.8"". 



Hal)itat.—Q'A\\Q, of Good Hope {Gray); Cbili {Flower)-, New Zealand 

 {Hector^ ? another species). 



8. SAGMATIAS Cope. 



Eostrum moderate, broad and tapering. Eostral portion of iuter- 

 maxilbe flat. Triangular area in front of superior imres elevated above 

 tbe plane of tbe surrounding parts. Pterygoid bones short, scarcely or 

 not toucbiug in tbe median line. Teetb small, 32. 



Exterior and skeleton not known. 



* This mounted skia is very much warped from its original shape, and the measure- 

 ments are, therefore, of doubtful value. 



