1. GASTEROSTEUS. 5 



3. Gasterosteus brachycentrus. 



Gasterosteus bracliycentrus, Cur. l^ V(d. iv. p. 499. pi. 98. f. 2 ; 



Thompson, I. c. p. 100 ; Yarr. Brit. Fishes, i. p. 9(5 ; Heck. Kner, 



SitHswusserJisehe, f. 17. 

 aculeatus, var., White, Catul. Brit. Fishes, p. 35. 



T). 1 I 1 I-. A. -. P. 10. V. 1/1. 



Three or four scaly plates above the pectoral fin. The anterior 

 dorsal spines only one-fifth of the height of the body ; the ventral 

 spine one-third of the length of the os innominatum. 



Italy. 



4. Gasterosteus biaculeatus. 



frasterosteus biaculeatus, Shtuv, Zool. iv. p. 608 ; Penn. Arct. Zool. 



ii. p. 385 ; Cuv. ^ Val. iv. p. 503. 

 cuvieri, Girard, Bost. Journ. vi. p. 254. pi. 7. f. 1. 



D.l|l|l A.-i. P. 9. V.1/1. 



Sides of the tail without scaly plates. The ventral spine with a 

 spinous process at the outer side of its base. Blackish. 

 Coasts of Newfoundland and Labrador. 



Gasterosteus biaculeatus, Dekay, New York Fauna, Fishes, p. fc!5, 

 pi, 3. f. 9, is a different fish, probably identical with Gasterosteus 

 noveboracensis. Strangely enough he says, " Vent 'with an anterior 

 pouch, analogous to that observed in Syngnathus.'^ (?) 



5. Gasterosteus tetracanthus. 



Gasterosteus tetracanthus, Cue, Sf Vul. iv. p. 499. 



D.l|l|l|f.. A.i. P. 11. V.1/1. 



Sides of the posterior part of body naked ; the anterior dorsal 

 spines shorter than one-third of the height of the body. {Cuv.) 

 Italy. 



6. Gasterosteus spinulosus. 



Gasterosteus spinulosu.s, Jett. <5r Yarr. ; Jen. Man. p. 350 ; iStark, 

 Jameson's Edinb. Journ. 1830, p. 327 ; Yarr. Brit. Fishes, i. p. 97; 

 Parn. I. c. p. 3(3. t. 25. 



aculeatus, var., Thompson, I. c. p. 103. 



D. 1 I 1 I 1 I f A. 1 P. 9. V. 1/1. 



Sides of the posterior part of body naked ; the anterior dorsal 

 spines about one-fourth of the height of the body ; the ventral spine 

 does not reach the posterior extremity of the pubic bone. 



Fresh waters of Great Britain.. 



a. Adult. Isle of Arran. Museum Ajcach. 



b. Half-grown. Berwick. Presented by Dr. Johnston. 



