748 Bulletin 47, United States National Museum. 



Gasterosteus elegans, BLANCHAKD, Poissons des eaux douces de France, 234, 1866, Cadillac and 



Langou; 6 plates. 

 Gasterosteus argyropomus, CUVIEK & VALENCIENNES, Hist. Nat. Poiss., iv, 498, 1829, Florence; 3 



plates. 

 Gasterosteus brachycentrus, CUVIER & VALENCIENNES, Hist. Nat. Poiss., iv, 499, 1829, Florence; 4 



plates. 

 Gasterosteus letracanthus, CUVIER & VALENCIENNES, Hist. Nat. Poiss., iv, 499, 1829, Florence; 4 



plates; 4 dorsal spines. 



Gasterosteus algeriensis, SAUVAGE, Revision des pinoches, 17, 1874, Algiers; 6 plates. 

 Gasterosteus islandicus, SAUVAGE, Revision des pinoches, '20, 1874, Iceland; 5 plates. 

 Gasterosteus gymnurus, CUVIER, Regne Animal, Ed. 2, n, 170, 1829, 



Gaslerosteus tpinulosm, JENYNS & YARRELL, Manual, 350, Edinburgh; 4 dorsal spines. 

 Gasterosteus aculeatus, JORDAN & GILBERT, Synopsis, 395, 1883. 



1099. GASTEROSTEUS BISPINOSUS, Walbaum. 

 (COMMON EASTERN STICKLEBACK.) 



Head 3i ; depth 4|. D. II-T, 13 ; A. I, 9 j lateral plates 33. Head rather 

 long. Caudal peduncle very slender, covered with plates similar to those 

 on the body, and provided with a conspicuous keel. Processes from 

 shoulder girdle below, covering most of the breast, leaving a narrow 

 naked area between them. Opercle finely striate. 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 the spines, of catfish. 

 Naked area in front of pectorals large ; pelvic bone lanceolate ; ven- 

 tral spine with a basal cusp ; spines all serrate, those of anal and soft 

 dorsal small. Dark greenish above ; sides silvery, or yellow ; membranes 

 of ventrals often red. Length 4 inches. The stickleback of the east 

 coast of North America seems to differ from the European Gasterosteus 

 aculeatus in having higher spines and more slender body. The dorsal 

 spines when depressed each extends beyond the base of the next. In other 

 respects G. Uspinosus does not differ materially from G. aculeatus. The 

 typical marine form has the body fully plated as in the marine form of G. 

 aculeatus ; its partly naked fresh- water varieties (atlcinsii, cuvieri, wJieatlandi} 

 are better defined than those of G. aculeatus, and are less abundant, being 

 still rare in collections. Labrador to New Jersey, near the coast, in salt 

 water ; very common in New England. (Ms, two : spinosus, spined.) 



Two-spined Stickleback, PENNANT, Arctic Zoology, n, 385, 1784; after FORSTEU; no locality 



specified. 

 Gasterosteus bispinosus, WALBAUM, Artedi Pise., 450, 1792; after PENNANT; said to be " New 



York," but more likely Hudson's Bay ; JORDAN & GILBERT, Synopsis, 395, 1883. 

 Gasterosteus biaculeatus, SHAW, Zool., iv, COS, 1839; after PENNANT, as above; STOKER, Hist. Fishes 



of Mass., 88, plate vnr, figs. 2 and 3, 1867. 



Represented in the rivers of Maine and Quebec by 



1099a. GASTEROSTEUS BISPINOSUS ATKINSII (Bean). 



Head 3 ; depth 4f ; eye 3J ; snout 3, a little greater than eye, pointed ; 

 mouth oblique, maxillary shorter than eye. D. II-1, 12 ; A. I, 8. Lateral 

 plates variable, usually from 10 to 22 in number, the posterior ones small 

 and weak ; caudal peduncle depressed, keel usually developed. First and 



