88 BULLETIN 3fi, UNITED STATES NATIONAL ]\IUSEUM. 



identical with L. danculm. The type-specimen consists only of the 

 beak (with the integuments) cut off close behind the last teeth. The 

 length of the superior tooth row is 0.8 inches ; width between the last 

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

 dihle, G.C inches; symphysis, 1.5 inches; depth of ramus at last tootli, 

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

 tines, 1.4 inches ; teeth, ||^ 



Fig. 1. 



Fig. 1 represents the type s[)ecimen seen from above, reduced to a little 

 more than two-tif«^hs natural size. 



I have carefully coinpnred the measurements of the exterior given 

 b3^ Waterhouse with Duguid's measurements of L. acntus,* and with 

 my own measurements of the type-cast of Professor Cope's L. jicrspi- 

 cillatus but find no correspondence between them. 



Compared with L. perftpicUlatus (which I regard as identical with Ij. 

 f(cufus), Fitzroy's dolphin ai>pears to have a smaller dorsal fin, t;iru;ite<l 

 farther from the extremit}' of the snout; and longer pectorals also 

 relatively farther from the extremity of the snout. The 8ha[)e 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. 



LafjcDorhynchus thicolea, Gray, Proc. Zool. Soc, London, 1849, p. 2. 



Eli'otra thicolea, Gray, Synopsis, Whales and Dolpliins, 1868, p. 7, pi. 3G ; Suppl. 



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

 Clymmia (Elcctra) thicolea, Flower, Proc. Zool. Soc, London, 1883, p. 512. 

 ? Delphiuus brevicejys, Wagner, Schreber's Siingeth., pi. 360, tig. 1 ; .laquinot et 



Pucheran,Zool. Voyage de I'Astrolabe et Z6l6e, iii, 1853, p. 39; Atlas, PI. 22, 



fig. 1. 



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

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

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

 aflbrded 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 Lagenorhijnehus, and after- 



Ann. & Ma;;. N. H.,(3), xiv, 1864, i)p. 134,135. 



