566 Analytical Notices of Books. 



been done by the Rev. Lansdown Guilding, under the name of 

 Caprella. and to which he has assigned the following character : 



Testa dextera " ovalis, spiralis, spira elevato-obtusa : anfracti- 

 bus duobus ultimis maximis ; os integrum elongatum : labium 

 internum uniplicatum, infra medium cavernoso-inflexum : 

 externum incrassatum marginatum." 



The animal of this species is described, as are also those of 

 Helicina fasciata, Bulimus haemastomus, (the shell of which is 

 subdiaphanous when young and covered with an epidermis, but 

 becomes pale as this is worn off and the animal approaches to ma- 

 turity,) and of Bulimulus stramineus^ a new species, u Testa 

 tenera, tota, straminea, transverse obscuro-dense striata : anfracti- 

 bus sex." To the generic character of Helicina is to be added, 

 " Tentacula duo setiformia : oculis radicalibus ;" and to that of 

 Bulimulus, li Tentacula 4, duo superiora longa oculis terminalibus : 

 operculum nullum." 



The papers which we have just noticed are highly creditable to 

 their industrious authour, and we cannot omit this opportunity of 

 observing that the most beneficial results would be derived to 

 Natural Science, if other gentlemen residing in our distant colo- 

 nies and possessions, would follow the example which he has thus 

 set before them. 



The only remaining article, which it comes within our scope to 

 notice, is one " On the Insect called Oistros by the ancient Greeks, 

 and Asilus by the Romans : by W. S. MacLeay, Esq.;" who justly 

 observes that " the determination of the animals and plants, men- 

 tioned by the ancient writers, must always be a pleasing subject of 

 research, tending, as it does, not merely to our better comprehen- 

 sion of the meaning of these authors, but also to our better ac- 

 quaintance with the mysteries of nature." For this investigation, 

 in those departments of Natural History to which he has devoted 

 his attention, no one can be better qualified, by classical as well as 

 zoological attainments, than the authour of the present paper, 

 which presents so closely connected a chain of argument and illus- 

 tration, as to render it extremely difficult to analyse. We shall, 

 therefore, merely observe, that Mr. MacLeay considers the insect 



