A HISTORY OF SURREY 



doing right in preferring the specific name which Persoon had given 

 it to that which others had given it in honour of Persoon. When in 

 1 872 I chanced to find this species near Copthorn Common in Surrey 

 it appeared not possible to assign it to any of the genera defined by Bate 

 and Westwood in their British Sessile-eyed Crustacea, but to demand the 

 re-establishment of Koch's genus Zia, which they had made a synonym 

 of Philoscia. On this latter point my opinion was confirmed by Mr. 

 Spence Bate himself. He also regarded the species as new, and upon 

 this encouragement I described it as Zia saundersii, little conscious of the 

 tissue of work to which this maiden effort would eventually lure me 

 on. 1 It was however at once recognized by Dr. A. M. Norman that 

 the species though new to England had been long known on the con- 

 tinent, and at the same time he pointed out that as Koch's genus was of 

 later date than Brandt's the species ought to be called Ligidium agile 

 (Persoon). 8 But even this did not conclude the business, for Budde- 

 Lund in 1885 at length established the proper name as L. bypnorum 

 (Cuvier). Besides the vicinity of Copthorn Common and of Charlwood, 

 which is not far distant from Copthorn, no locality British or Irish seems 

 to have yielded this species. From all our ordinary inland woodlice it 

 is very easily distinguished by the second antennae. In these it will be 

 noticed that the flagellum or whip-like terminal part is divided into ten 

 or eleven small joints. An equally well marked character is furnished 

 by the other extremity, the tail-feet or uropods being peculiarly con- 

 structed. The peduncle of these is strongly produced on the inner side, 

 and though the inner branch affixed to the tip of this process is much 

 smaller than the outer branch, yet it extends much beyond it by help of 

 its two long apical bristles. The animal's coat is smooth and shining, 

 the animal itself is delicate and easily damaged, the two caudal bristles 

 when moist readily adhere together and look like one. 



In the family Trichoniscidae Surrey has the little claret-brown 

 Trichoniscus pusillus, Brandt. It has been found in the same neighbour- 

 hood as the previous species, but unlike that it is rather common and 

 widely dispersed. It was called Itea riparia by Koch, and Bate and 

 Westwood have followed Kinahan in calling it Philougria riparia, mean- 

 ing that it is fond of moisture and is found on banks and braes. But 

 Brandt's names for it are the earlier and must prevail. Its second antennas 

 are rather strikingly geniculated, and little outstanding spines give them 

 a thorny appearance. The flagellum or lash has only four joints. 



Of the family Oniscidae there are at least five species in Surrey, 

 Oniscus asellus, Linn., Philoscia muscorum (Scopoli), Metoponorthus pruinosus 

 (Brandt), Porcellio scatter, Latreille, and P. dilatatus (Brandt). The first 

 three of these have been found in the Copthorn district, the second is on 

 record from Reigate, 3 the second, third and fourth have been sent me by 



1 Ann. Nat. Hist. ser. 4, vol. xi. p. 236 (1873) ; Prof. Holmeidale Nat. Hist. Club, October, 1872, 

 to April, 1875, p. i. 



* jinn. Nat. Hist. ser. 4, vol. xi. p. 419. 

 8 Proc. Holmesdale Nat. Hist. Club (1872-5), p. I. 



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