338 NEW YORK STATE MUSEIUM 



As in E u c a 1 i a , the gill membranes form a broad fold ac-ross 

 the isthmus. Vertebrae 14+18=32. Species two, in northern 

 regions, the following cosmopolitan; a second, Pygosteus 

 s i n e n s i s Guichenot, from China. 



170 Pygosteus pungitius (Linnaeus) 

 10 spined Stickleback 



Gast&rosteus pungitius LINNAEUS, Syst Nat. ed. X, 296, 1758, Europe; GUN- 

 THER, Cat Fish. Brit. Mus. I, 6, 1859; STOKER, Hist Fish. Mass. 43, 

 pi. VIII, fig. 5, 1867; BEAN, Bull. 15, U. S. Nat Mus. 133, 134, 1879; 

 JORDAN & GILBERT, Bull. 16, tJ. S. Nat. Mus. 393, 1883; BEAN, 19th 

 Kept. Commrs. Fish. N. Y. 244, 1890. 



Gast&rosteus ocddentalis DE KAY, N. Y. Fauna, Fishes, 68, pi. 42, fig. 135, 

 1842; STORER, Syn. Fish. N, A. 63, 1846. 



Gast&rosteus concinnus RICHARDSON, Fauna Bor.-Amer. Ill, 57, 1886, Sas- 

 katchewan River and Great Bear Lake. 



Gasterosteus nebulosus AGASSIZ, Lake Superior, 310, pi. IV, fig. 2, 1850. 



Pygosteus pungitius EIGENMANN, Proc. Ac. Nat Sci. Phila. 235, 1886; JORDAN 

 & EVERMANN, 'Bull. 47, U. S. Nat. Mus. 745, 1896; BEAN, 52d Ann, 

 Rept. N. Y. State Mus. 100, 1900. 



Body moderately elongate and compressed, its greatest depth 

 one sixth of total length to base of caudal rays, its width one 

 tenth of the same length and two fifths of the length of the 

 head. The head is one fourth of total length to base of caudal r 

 its width contained two and one third times in its length; the 

 length of the snout equals the width of the interorbital space, 

 and nearly one fourth the length of the head; the upper jaw is 

 slightly more than one fourth the length of head, and the man- 

 dible is nearly as long as the eye, which is contained about three 

 and one fourth times in length of head. The spinous dorsal 

 is inserted at a distance from tip of snout equal to two sevenths 

 of total length without caudal; its base is a little longer than 

 the head; its first and second spines equal, and one fourth a& 

 long as the head; its last spine less than one fifth as long as 

 the head. The base of the soft dorsal is three times as long 

 as the mandible; the antecedent spine is as long as the mandible; 

 the first ray is longest, and is twice as long as the upper jaw. 

 The anal origin is twice as far from tip of snout as the spinous 

 dorsal; the anal base is twice as long as the middle caudal 



