G4. GASTEROoTEID^ GASTEROSTEUS. 
395 
02§. <Go EaaccB’ocepSuaScis Gii-anl. 
Olivaceous, silvery below; skin thickly puuctulate; males blackish in 
spring, with coppery or golden lustre. Body short, deep, moderately 
compressed, (kiudal peduncle rather deep and compressed. Posterior 
l^art of body unarmed. Processes from shoulder-girdle below widely 
diverging, leaving a triangnlar 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 si)ines attached to bony plates, as in G. acu- 
Icatus. Head 3; depth 33 . D. II-1, 11 ; A. I, 8. Lateral plates, 4 to G. 
Pacific coast of the United States, ascending streams, abundant south- 
ward. 
(Girard, Proc. Acad. Nat. Sci. Pliila. 1854, 134: Gasferosleiis plcheins and inopiuatus 
Girard, 1. c. 147: Gasferosfeiis piq/elti, Girard, U. S. Pac. R. K. Surv. Fish. 92.) 
629. G. bfiacialeattss 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, G03, 1805; Giinther, i, .5 : Gafiterosteua gymnurus Cuvier, Regue 
Auim. : Gastcrosteus hiiirus Cnv. ct Val. iv, 481: Gautvrosteus ciivieri Girard, Bo.st. Jonrn. 
Nat. Hi.st. vi, 254 ; Gasterostcus aculeatus trachurus Gooilo & Beau, Bull. Essex lust. 1879, 
5: Gasterosieus ichcallaudi Putnam, Proc. Essex Inst. 1837,4.) 
an. Tail keeled, armed with plates. 
630. G. atiiiessii Bean. 
Reddi.sh, silvery below and with dark bands across the body. Body 
slender, as in G. inDuiitius. 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 34- 
in length; depth 5. D. II-I, 11; A. I, 8. {Bean.) Schoodic Lakes, 
Maine. 
(Beau, Proc. U. S. Nat. Mns. 1879, G7.) 
63 i. G. acu8e»ltsis L. — Common SticJdchaclc ; Burnsticlie. 
Dark greenish above; sides silvery, or yellow; membranes of ventrals 
often red. Head rather long. Caudal peduncle very slender, covered 
with plates similar to those on the body, and provided with a conspicu- 
ous keel. Processes from shoulder girdle below, covering most of the 
breast, leaving a narrow uiiked 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 firml}’ set, like 
