Viola imberbis, a ? Species new to the British Flora. 277 



(I. 573.) The long eyes of most of the Podophthalma, 

 when at rest, are laid in a cavity adapted to their shape : in 

 many genera the fossula is excavated with extraordinary skill 

 and care. In others, where the eyes are seated in a circular 

 excavation the peduncles are short and thick, and are merely 

 drawn down a little as a protective from danger. 



(II. 206.) In my extensive and interesting collection of 

 West Indian Crustacea, there is a beautiful Portumnus, on the 

 arms of which are bright, square, pearly specula of great 

 beauty. Now, though this genus does not cover its body 

 with extraneous matter, and wait in ambush for its prey, I 

 have no doubt that these splendid ornaments contribute to 

 attract their prey. 



(II. 24.) In this island [St. Vincent], the timbers of wharfs, 

 &c, immersed in the sea, are sometimes coated with ship's 

 copper : the plan of the rusty nails seems very ingenious, 

 Some of our minute Crustacea, from their countless numbers 

 and boring habits, are not less injurious than the Teredo.] 



[Variableness in the Characteristics of Crustaceans of the same 

 Species, according to Age, Sex, fyc. — Dr. Johnston has expressed, 

 in VII. 235., his opinion that, in certain forms of the genus 

 JE^ga, the greater or less dilatation of the basilar joints of the 

 antennae " is a sexual character, or one dependent on age, and 

 of insufficient value, therefore, to be ranked among characters 

 which are seized upon to divide tribes or families from each 

 other ; and that the conformation of the extreme caudal seg- 

 ment is not sufficient to discriminate species, as Dr. Leach 

 seems to have believed, for his specific characters embrace 

 no other part." We understand these remarks as intended 

 to be applied, not to species of JE^ga alone, but to species of 

 Crustacea somewhat generally ; and we have, in this view 

 of them, deemed them too useful to the student of the Crus- 

 tacea to incur us censure for reprinting them.] 



A Mode qf preserving Specimens of Crustacea, practised by 

 Mr. Yarrell, has been described by him in the Entomological 

 Magazine, i. 421, 422. 



Art. VI. On Viola imberbis [Leighton], a f Species qf Violet 

 supposed to be nevo to the British Flora ; with brief Observations 

 on some Peculiarities qf Viola lactea, Viola carilna, Ranunculus 

 Ficaria, and Galium cruciatum. By W. A. Leighton, Esq. B.A. 



In a botanical ramble in the immediate neighbourhood of 

 Shrewsbury, in spring, 1833, 1 gathered on the south-western 



