64. GASTERO^TEID^: - GASTEROSTEUS. 395 



628. G. lauBCD'OcepZaaltis Girard. 



Olivaceous, silvery below; skin thickly punetulate; males blackish in 

 spring, with coppery or golden lustre. Body short, deep, moderately 

 compressed. Caudal peduncle rather deep and compressed. Posterior 

 part of body unarmed. Processes from shoulder-girdle below widely 

 diverging, leaving a triangular area on the breast; naked area in front 

 of pectorals small. Ventral spines serrate, without distinct basal cusp. 

 Spines of soft dorsal and anal small. Innominate bone lanceolate, twice 

 as long as broad. Dorsal spines attached to bony plates, as in G. acu- 

 Icatus. Head 3; depth 3. D. H-1, 11; A. I, 8. Lateral plates, 4 to 6. 

 Pacific coast of the United States, ascending streams, abundant south- 

 ward. 



(Girard, Proc. Acad. Nat. Soi. Phila. 1854, 133 : Gastcrostens plcbeins and inopinatus 

 Girard, 1. c. 147: Gasterosteus pugelti, Girard, U. S. Pac. R. R. Snrv. Fish. 92.) 



629. G, foiaciaEeaftass Shaw. 



Closely related to the preceding, but rather larger; the innominate 

 bone triangular, two-thirds as broad as long. Ventral spine with a 

 distinct basal cusp on its outer edge. D. II-I, 12 ; A. I, 9. Northern 

 Europe and United States from Cape Cod northward. Considered by 



most European writers as a variety of G. aculeatus. 



(Shaw, Gen.Zool.iv, 60S, 1805; Giiuther, i,f>: Gasterosteus gymnurus Cuvier, Regue 

 Auim. : Gasterosteus Innrus Cuv. et Val. iv, 481: Gasterosteus cuvieri Girard, Bost. Jonrn. 

 Nat. Hist, vi, 254 ; Gasterosteus aculeatus trachurus Goode & Bean, Bull. Essex lust. 1879, 

 . r >: Gasterosteus ivhcatlandi Putnam, Proc. Essex Inst. 18G7, 4.) 



art. Tail keeled, armed with plates. 



630. G. atBcinsifi Beau. 



Keddish, silvery below and with dark bands across the body. Body 

 slender, as in G. pungitius. Lateral plates 15 in number, the posterior 

 very thin, covered by skin. Tail keeled. Ventral spines long, nearly 

 or quite reaching the vent ; dorsal spines in a straight line. Head 3^ 

 in length; depth 5. D. II-I, 11; A. I, 8. (Bean.) Schoodic Lakes, 

 Maine. 



(Beau, Proc. U. S. Nat. Mus. 1879, 67.) 



631. G. aculcaleis L. Common Stickleback; Bnrstickle. 



Dark greenish above; sides silvery, or yellow; membranes of ventrals 

 often red. Head rather long. Caudal peduncle very slender, covered 

 with plates similar to thos;; on the body, and provided with a conspicu- 

 ous keel. Processes from shoulder girdle below, covering most of the 

 breast, leaving a narrow n*ked area between them. Opercle finely stri- 

 ate. Large rugose bony plates on each side of base of dorsal spines, 

 the latter joined to them by a hinge and capable of being firmly set, like 



