88 BULLETIN 3G, UNITED STATES NATIONAL MUSEUM. 



identical with L. clancuJus. The type-specimeu consists only of the 

 beak (with the integnments) cnt off close behind the last teeth. The 

 length of the snperior tooth row is G.8 inches ; width between the last 

 upper teeth on opposite sides, 2.4 inches ; length of tooth row of man- 

 dible, 6.6 inches; symphysis, 1.5 inches; depth of ramus at last tooth, 

 1.3 inches ; width of deviated portion of the maxillary joining the pala- 

 tines, 1.4 inches; teeth, ^g£|| 



Fig. 1 represents the type specimen seen from above, reduced to a little 

 more than two-fifths natural size. 



I have carefully compared the measurements of the exterior given 

 by Waterhouse with Dugnid's measurements of L. acntus,* and with 

 my own measurements of the type-cast of Professor (Joyie's L. perspi- 

 cillatus but find no correspondence between them. 



Compared with L. perspiciUattis (which I regard as identical with L. 

 acutus), Fitzroy's dolphin appears to have a smaller dorsal fin, mtnated 

 farther from the extremity of the snout; and longer pectorals also 

 relatively farther from the extremity of the snout. The shape of the 

 head and the pattern of coloration seem to be very different. 



This species cannot be properly studied until more specimens have 

 been obtained. 



LAGENORHYNCHUS THICOLEA Gray. 



Lafinwrlnjvclius IhicoJea, Gray, Proo. Zool. Soc, London, 1849, p. 2. 



Ehdra thicoh'n, Gray, Synopsis, Whales aud Dolpliins, 1808, p. 7, pi. 30; Snppl. 



Cat. Seals and Whales, 1871, p. 77. 

 Clymcnia (Elcctra) thicolea, Flower, Proo. Zool. Soc., London, 1883, p. r)12. 

 ? DelphiitKs hrericeps, Wagner, Schreber's Siingeth., pi. 360, fig". 1 ; .Taqninot et 



Pucheran, Zool. Voyage de I'Astrolabo et 7u6\6e, iii, 1853, p. 39; Atlas, PI. 22, 



tig. I. 



This species, like L. loiigidens, is one whose affinities are uncertain. 

 Founded upon a single defective skull, reported to have been ob- 

 tained on the west coast of North America, no opportunities are 

 afforded for an estimate of the individual variation to which it is prone, 

 or even for a very accurate determination of its cranial proportions. 



Gray first placed the species in his genus LagenorhyncJms, and after- 



• Anu. & Mag. N. H.,(3), xiv, 1864, pp. 134, 13.'>. 



