436 Bibliographical Notice. 



evident that Mithras paradoxus, together with its congeners M, 

 ftavidus and M. dubius, should occupy a place in the family 

 Cinifionida, immediately after the genus Veleda. 



The foregoing discovery necessitates a modification, as sub- 

 joinedj of the characteristics of the 



Genus Mithras. 



Ei/es eight, unequal in size, and disposed on the sides and ante- 

 rior part of the cephalothorax in two transverse, curved 

 rows ; those of the posterior row, which is much the longer, 

 and has its convexity directed forwards, are larger than 

 those of the anterior row, the lateral eyes, which are seated 

 on bold conical tubercles, being rather the largest; the 

 eyes of the anterior row, whose convexity is directed up- 

 wards, are situated above the prominent frontal margin; 

 the two intermediate ones are placed near to each other on 

 a minute tubercle, and the lateral ones are not very con- 

 spicuous, being the smallest and lightest-coloured of the 

 eight ; the lateral eyes of both rows are separated by a wide 

 interval. 



Maxillce short, straight, powerful, and greatly enlarged at the 

 extremity. 



Lip triangular or somewhat oval. 



Legs robust, of variable relative length in different species, each 

 metatarsus of the posterior pair having a calamistrum on 

 its superior surface. 



Spinners eight ; those of the inferior pair, which are the shortest, 

 consist of a single joint each, and are united throughout 

 their entire length. 



BIBLIOGRAPHICAL NOTICE. 



An Elementary Text-book of the Mici'oscope ; including a descrip- 

 tion of the Methods of preparing and mounting Objects, ^c. By 

 J. W. Griffith, M.D., F.L.S. 12mo. Van Voorst, London, 18G4. 

 Notwithstanding the numerous books of various kinds which have 

 been published as guides in the employment of the microscope. Dr. 

 Griffith appears to us to have justly come to the conclusion that there 

 was room for one more ; and the mode of treatment which he has 

 adopted in the little work now before us places it, in some respects 

 at least, not only apart from, but in a superior position to most of 

 its predecessors and competitors. It is, in fact, rather as an ele- 

 mentary course of microscopic research than as a ' Text-book of the 

 Microscope' that we welcome its appearance, by far the greater 

 portion of its pages being devoted to the description of the most 

 characteristic objects for microscopic examination derived from the 

 animal and vegetable kingdoms. By a judicious arrangement of 



