1913.] NATURAL SCIENCES OF PHILADELPHIA. 69 



No. 19,848, A. N. S. P., type of Mijloleucus thalassimis Cope. 

 It agrees largely with Rutilus bicolor Gilbert.^ The head is given 

 as 3| to 3f, which is a little smaller than in the types of Algansea 

 antica Cope. Gilbert has identified Myloleucus parovanus Cope 

 with this species, though is not followed by Snyder.^ 



Also a series of examples from Klamath Lake and Goose Lake, 

 Oregon (Cope), and "Pyramid Lake, Nevada"? (Cope). The 

 Klamath Lake specimens were all identified by Cope as M. parovanus. 

 Likely the Pyramid Lake example is wrongly labelled. 

 Rutilus anticus (Cope). Fig. 5. 



Algansea antica Cope, Proc. Acad. Nat. Sci. Phila., 1864, p. 282. '"Texas." 



Head 2| to 3|; depth 3^ to 3f ; D. in, 7, i; A. iii, 7, i; scales 45 to 

 50 in 1. 1. to caudal base +2 or 3 more on latter; 10 to 12 scales above 

 1. 1.; 7 or 8 scales below 1. 1.; 24 to 26 predorsal scales; snout 3y to 



Fig. 5. — Rutilus anticus (Cope). (Type of Algansea atitica^Cope.) 



4 in head; eye 4 to 5j; maxillary 3| to 4; interorbital 3j\ to 3^; 

 teeth 5—5 or 5—4; length 3|? to 5| inches. 



Nos. 4,911 (type) to 4,913, A. N. S. P., cotypes of Algansea antica 

 Cope. The type locality given as "Texas" is doubtless erroneous, 

 no member of the genus ever having been found there. It is likely 

 these specimens really came from some lake or stream in California, 

 Nevada or Oregon?. Provisionally, they may be distinguishable 

 from Myloleucus bicolor by the larger head, ranging as 2| to 3|. 



3 Bull. U. S. F. Com., XVII, 1897, p. 8, fig. 

 * Bull. Bur. Fisher., XXVII, 1907, p. 86. 



