128 Part [I11.—Twenty-fourth Annual Report 
The Number of Rays in the Paired Fins and Caudal Fin, 
t 
Length | | 
| | if BS aoe 
Species. of he Sex. | \ ent Pecto Caudal 
| ase ral Fin.|ra] Fin.| Fin. | 
Fish. | | | | 
= earn | Be. eee ee io 
Cm. | | | 
| 24 oO UN Go 19. daeee 
| | 26 3 Leh Ness 
G. luscus. erat He eid 6 | 20 | 40 
2 rl rahe Molar Nk rong eM 
Average, | 6 (4) | 19 (4)/39 (2) 
14 2 6 19 
14 2 6 19 
19 Ae Leak heme 
yl 2 Ce WO 
| . e272 2 6 | 18 39 | 
| G. minutus. | 93 Q Go das 39. 
| 24 Q 6 19 38 
eer as $v 6 19 
| 
Average, | 6 (8) | 19 (8) |38-6(3) 
| 
15) | ge og Neon 
Nee he 6 | 19 
16 a 6 19 
G. esmarkit. ieee Q 6 1.226 4.0 
| 
Average, «= 6 (5) |19°6(5), 
| | 
In all the specimens examined the same number of rays was obtained 
in the ventral fin, viz.,6. In the case of the pectoral fin there is a 
fairly similar amount of variation in each species; and the number of 
caudal rays is apparently very similar in the three species. The absence 
of variation in the ventral fin is to be expected, from the fact of there 
being so few rays. That may be one of the factors, but it may also be 
in part due to the fact that the ventral fin has a well fixed function in 
the genus—that its function, whatever it may be, is exactly similar in 
each of the species in which its rays remain the same. 
The Lengths of the Ventral and Pectoral Fins. 
The authors of “The Scandinavian Fishes” state in their description 
of G. minutus that the tip of the ventral fin reaches past the anus. This 
is not constant. The ventral fin has a long filamentous tip in the 
three species, 
