REVIEWS. 69 



necessary for the purposes of description and recognition. Yet, on the 

 whole, he has abstained from using his privilege of creating and naming 

 unnecessary fossil species in this volume more than might have been ex- 

 pected from his previous works. Amongst his new genera, the geologist 

 will gladly perceive several which ought to have been recognised before, and 

 which serve to draw more distinctly the line of demarcation between recent 

 and fossil forms. Among the most judicious of these changes we may 

 mention the new genus Aviculopecten, of the middle and upper Palaeozoic 

 beds, to the separation of which from the recent Pectens, Mr. M'Coy was 

 led by the examination of a series of fossils from the dark limestone 01 

 Lowick, Northumberland, at present preserved in the collection of the Uni- 

 versity of Cambridge. From these fossils it was evident that in the Palaeo- 

 zoic Pectens there was no mesial ligamentary pit beneath the beak, as in 

 recent Pectens, but the ligament, as in Avicula, is confined to the hinge 

 margin, while the external form of the shell closely resembles the recent 

 Pecten, with the exception that the posterior ear is larger than the anterior, 

 thus differing from Pecten and approaching Avicula. 



We strongly recommend this handbook of Professor M'Coy to those geo- 

 logists who have an opportunity of comparing its descriptions with the 

 Cambridge fossils, and to those who are in possession of the works in which 

 the fossils described in it are figured. 



THE ENTOMOLOGISTS' ANNUAL FOR 1855, comprising Notices of the 

 new British Insects detected in 1854. Edited by H. T. Stainton. 

 Pp. 153. With a coloured plate. London : John Van Voorst, Pater- 

 noster-row. 1855. Price 2s. 6d. Second Edition, with considerable 

 additions. 



"WHAT are the additions?" will be the first question suggested by the 

 above somewhat unlooked-for announcement of a second edition of the 

 Annual. We shall at once supply the information by telling our readers 

 that they consist of instructions for collecting, preserving, and arranging, 

 lepidoptera and coleoptera, together with a few scattered notes of addi- 

 tional localities, &c., of different species, and an " Address to the Young 

 Entomologists at Eton, Harrow, Winchester, Rugby, and at all other 

 schools." 



How the necessity arose for publishing this edition we shall allow the 

 author to explain in his own words 



" The enthusiastic reception which * The Entomologists' Annual' has 



