364 REVIEWS. 



the entire order Hymenoptera, upon which the author has 

 bestowed so much attention, and in which we find the natu- 

 ral habits of the insects, as well as their structural peculiari- 

 ties, considered as the ground-work of the classification here 

 proposed. 



It is impossible to compare these two works together with- 

 out noticing the different mode in which they are written : — 

 whilst the latter exhibits a lucid methodical arrangement in 

 all its parts, the former is lamentably deficient therein. For 

 instance, there is no generic character of Aphelinus and Pter- 

 optrix ; and almost every species is formed into a distinct 

 section, apparently of equal rank, without any gradation al 

 series of groups. Thus, although the species may be well 

 described specifically ', their generic and subgeneric investiga- 

 tion will be attended with endless labour, unless the work be 

 revised. As there are 84 species of Cirrospilus here describ- 

 ed, it would have been well to have republished the 74 which 

 have already, or are intended to appear in the i Annals of 

 Natural History,' and in which they are scattered through 

 many numbers. 



Art. II. — 1. Supplement to the ' History of British Fishes. 11 By William 



Yarrell, F.L.S. London : Van Voorst. 1839. 

 2. On the Growth of the Salmon in Fresh Water. By the same Author. 



Van Voorst. 



The additions made to British Ichthyology in the short pe- 

 riod that has elapsed since the publication of Mr. Yarrell's 

 valuable ( History of British Fishes,' have now enabled the 

 author to increase his work by the descriptions of nearly thir- 

 ty species. Figures of all these are given in the present sup- 

 plement, which, with their history, adds 72 pages of matter 

 to the original publication. Of course, the supplement will 

 fiud a place in the library of all those who possess a copy of 

 the previous volumes, in the second edition of which latter 

 we suppose the additional species will be incorporated. One 

 of the fishes now recorded by Mr. Yarrell as an acquisition 

 to the Fauna of the British seas, is also new to Ichthyology 

 generally; it is a species of the genus Osmerus. captured 

 near Roth say, in the isle of Bute, and sent to the author by 

 Mr. William Ewing, of Glasgow. It is described under the 

 specific name Hebridicus. 



The following is a list of the genera to which the additions 

 contained in the Supplement are referable. — Trigla, 1 ; Peri- 

 stedion, 1, (from Dr. Edward Moore; described Mag. Nat. 

 Hist., vol. i. n. s.) ; Gobius, 3 ; Crenilabrus, 2; Abramis, 1 ; 

 Exoccetus, 1 ; Salmo, 1 ; Coregonus, 2; Motclla, 1 ; Platessa, 



