Rate of Growth in Gobius minutus. 



233 



measuring 61 mm. showed 55 and 56 concentric rings on 

 adjacent scales (see PI. IX. fig. 5). A form taken in the same 

 month and measuring 58 mm. showed 60 and 65, while 

 another measuring 52 mm. showed 72 concentric rings upon 

 scales from the typical area. 



(2) G. friesii. 



Scales very large, only 28-29 in a longitudinal row, 8-9 in 

 vertical, oblong in shape, with the teeth on the longer slightly 

 convex side. The teeth are rather uneven in large (85 mm.) 

 specimens; they have slightly swollen bases. The radial 

 markings are pronounced and usually terminate in slight 

 clefts in the side of the scale opposite to that which bears the 

 teeth (see PI. IX. fig. 6). The following table will bring out 

 the fact that though the number of concentric rings is fairly 

 constant for scales taken from the same part of the same fish, 

 yet the numbers bear no relation to the size of the fish from 

 which the scales were taken. 



(3) G.flavescens (olim ruthensparri). 



One of the small-scaled gobies, 35-40 scales in a longi- 

 tudinal row, 12-15 in vertical. Roughly circular in outline, 

 with a rather acute curve of the portion to which the teeth 

 are attached. Teeth long and even, more symmetrical than 

 those of other species. The smallest specimens from which 

 scales were obtained measured 19 mm. Three scales taken 

 from the typical area of a 25 mm. specimen each showed 10 

 concentric rings. 



(4) G. minutus. 



Scales very small and variable in number, upwards of 60, 

 though often much less, in a longitudinal row, 13-19 in 

 vertical. Outline elliptical, with the teeth placed along the 



Ann. & Mag. N. Hist. Ser. 8. Vol. v. 17 



