G4. GASTEROSTEID^ GASTEROSTEUS. 395 



69§. O. cnicfi'oecplaaltis Glranl. 



Olivaceous, silv^^ry below; skin thicklj' punctulate; males blackish in 

 spring-, with cop])eiy or golden lustre. Body short, deep, moderately 

 compressed. (Jaudal peduncle rather deep and compressed. Posterior 

 l)art 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 3i|. D. II-1, 11 ; A. I, 8. Lateral plates, 4 to 6. 

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

 w^ard. 



(Girard, Proc. Acad. N.it. S^-i. Pliila. 1854, 13;^ : Gasfcroftieus j9?r?)r)HS and iiio2)ina1us 

 Girard, 1. c. 147: GaateroHtciis pugvlli, Girard, U. S. Pac. R. R. Surv\ Fish. 92.) 



629. G. bBai-tiBeatcss Sliaw. 



Closely' related to the i)receding, 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 

 Euroi^e and United States from Cape Cod northward. Considered by 



most European writers as a variety of G. aculeatus. 



(Shavr, Gen.Zool. iv, 603, 1805; Giiutlier, i, 5: CrafitcrofifeHs gi/mniirtis Ciivier, Rogue 

 Auiin. : Gasfcroytcus hiiirnn Cuv. et Val. iv, 481: Gastcrosfeiis cuvieri Girard, Bost. .Jouru. 

 Nat. Hist, vi, 254 ; Gastcrontciis aculeatus tracliurus Goode &Beau, Bull. Essex lust. 1879, 

 5: Gasterosteus xvhoatlandi Putnam, Proc. Essex Inst. 1837, 4.) 



aa. Tail keeled, armed with plates. 



630. O. ;atkinsii Beau. 



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

 slender, as in G. imn(iitius. Lateral plates 15 in number, the i)osterior 

 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.) 



63 1. O. aculcJltElS L. — Common SticJcIehacl: ; Burnfiticlcle. 



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

 often red. Head rather long. Caudal i^eduncle very slender, covered 

 with i)lates 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. Oi)ercle finely stri- 

 ate. Large rugose bony plates on ea(!h side of base of dorsal spines, 

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



