1886.] NATURAL SCIENCES OF PHILADELPHIA. 24t 



7. Gasterosteus dimidiatus. 



Gasterosteus biaculeatus Cuvier & Valenciennes, Hist. Nat Poissons, 

 iv, 503, 1829 (Newfoundland, not O. biaculeatus of Shaw); Giinther, 

 Cat. Fish. Brit. Mas., i, 5. 1859 (Coast Newfoundland and Labra- 

 dor); Gill, Cat. Fish. East Coast N. A., 16, 1873 (Name only); 

 Sauvage, Revision des Epinoches, 21, 1874 (Newfoundland); Jordan, 

 Cat. Fish. N. A., 442, 1878 (Name only); Jordan & Gilbert, 8yn. 

 Fish. N. A., 395, 1883 ; Stearns, Proc. U. S. Nat. Mus., 1883, 123 

 (Labrador). 



Gasterosteus dimidiatus Reinhardt, Green. Faun. 37, 1837 (Greenland); 

 Reinhardt, "Kong. Dansk. Vidensk. Selsk. Nat. og. Math. Afhand. 

 vii, 193," 1838; Sauvage, Revision des Epinoches, 28, 1874 (Name 

 only). 



Gasterosteus aculeatus var. dimidiatus Gill, Cat. Fish. East Coast N. 

 A., 39, 18G1 (Name only). 



Gasterosteus cimeri (Girard MSS.) Storer, H. R. Fish. Nova Scotia and 

 Labradoi-, 254, plate vii, fig. 1, 1849 (Bras d'Or, Red Bay). 



Habitat East Coast North America, northward. 



This species differs from its nearest relations in having a cusi^ 

 at the base of the ventrals and a fleshy caudal carina. 



The name biaculeatus cannot be retained for this species, as it 

 was originally based on a description of Pennant which appar- 

 ently refers to G. aculeatus. 



I have examined no specimens of this species, and I am not 

 sure that it diffei'S in any important respect from the naked tailed 

 sticklebacks (G. gi/mnurus Cuvier = G. leiurus Cuv. and Yal.) 

 of Europe. 



8. Gasterosteus williamsoni. 



Gasterosteus williatnsoni Girard, "Proc. Acad. Nat. Sci. Phila., 133," 

 1854 (Williamson Pass); Girard, Pacific R. R. Survey, 93, 1859 

 (Williamson Pass); Sauvage, Revision des Epinoches, 25, 1874; 

 Jordan, Cat. Fresh Water Fish. N. A., 441, 1878 ; Jordan & Gilbert, 

 Syn. Fish. N. A., 393, 1883; Rosa Smith, Proc.U. S. Nat. Mus., 

 1883, 217 (Artesian well at San Bernardino). 



Eucalia williamsoni Jordan & Copeland, Checklist Fresh Water Fish. 

 N. A., 141, 1876. 



Habitat. Streams of California. 



This species differs from the other species of this genus in 

 having no lateral plates. Miss Rosa Smith records one from an 

 artesian well in California and pronounces it a true Gasterosteus 

 and not a Eucalia. 



The species is known to me from Girard 's description in the 

 Pacific R. R. Survey, and from the account given by Miss Smith. 



