412 



TELEOSTEI 



lateral and dorsal rows of scutes. Large paired scutes are attached to 

 the pelvic as well as to the pectoral girdles (Fig. 407). The pelvic fina 



FIG. 408. 

 Gasterosteus aculeaius, L. (After Heckel and Kner, from Clans and Sedgwick.) 



have one or two spines, and sometimes one or two jointed dermotrichs. 

 The pectoral radials are quite short (Fig. 406). The anterior region of 

 the dorsal fin is represented by a series of finlets with 

 isolated spines (Fig. 408). The anal fin has an anterior 

 spine. 



Family GASTEROSTEIDAE. The ribs are slender and 

 free, and the pelvic fins have not more than two 

 jointed dermotrichs. 



Gasterosteus, Art., Sticklebacks (Fig. 408) ; Apeltes, 

 De K. ; Eucalia, Jord. ; Spinachia, L. Northern 

 hemisphere. 



Family AULORYXCHIDAE. With a longer and more 

 tubiform snout, an elongated body, and four jointed 

 dermotrichs in the pelvic fin. The ribs are expanded 

 and fixed to the lateral scutes. 

 A ulorhynchus, Gill ; N. Pacific. 



\ 



TRIBE 2. HEMIBRAXCHII. 



FIG. 409. 

 Ankylosed anterior 



The snout is extremely long and tubiforni, the 

 skull consequently much modified, the symplectic 

 and neighbouring bones being much lengthened. The 

 pelvic fins are spineless, with from three to six 

 lepidotrichia. The ribs are reduced or absent, but 

 parapophyses are usually present. This Tribe is 

 distinguished by the specialisation of the anterior 

 vertebrae, four of which generally become enlarged, 

 fou r vertebrae of Fiatu- elongated, and often fused together (Fig. 409). 



! Anaiomylfyfrtelnttel', SUB-TRIBE A. PROTOSYNGNATHOIDEI. Slender free 



by permission.) r ;bs are present, and the anterior vertebrae are 



slightly elongated. This extinct group is less 

 specialised than the next. 



Family PROTOSYXGNATHIDAE. Protosyngnathus, v. d. M. ; Tertiary of 

 Sumatra. 



SUB -TRIBE B. AULOSTOMOIDEI. The body is very elongate ; the occip- 

 ital condyle becomes distinctly convex, and long ossified ligaments extend 



