TRANSPLANTATION OF BIVALVES. 65 



A Specimen of Dytiscus marginalis with a shell of 

 Sphceriuni lacustre clinging to one of the front legs was 

 caught by Mr. Standen, in a pond at Gorton, in 1890. 

 The shell had been slightly broken, probably from 

 having been dashed against some object by the insect, but, 

 being still alive^ it held on tightly. A beetle belonging 

 to the allied genus Acilius with a shell of Pisidiiim 

 fontinale on one of the legs of the second pair has been 

 presented to the Manchester Museum by Mr. Hardy/ 

 and I hear from Sydney that two water-beetles with 

 Pisidia attached were obtained by Mr. Whitelegge (now 

 of the Australian Museum) when collecting, years ago, 

 in Lancashire ; in one of the cases two shells were 

 clinging to the same insect, one on each side. 



Two or three instances of the clinging of bivalves to 

 the antennae of water-beetles have been observed,' and 

 Mr. A. J. Jenkins tells me that in a large bell-glass, 

 which he used as a sort of aquarium, a Pisidium on one 

 occasion fastened its valves tightly upon one of the 

 maxillipedes of a shrimp. 



Before coming to any conclusion as to whether water- 

 beetles, -bugs, etc., have much affected the ranges of 

 bivalve-molluscs and have helped in any perceptible 

 degree to stock newly formed and isolated ponds with 



^ This and the other specimens here stated to have been 

 presented to the Manchester Museum were obligingly sent to me 

 in London for examination ; two of them, I regret to say, were 

 damaged in the post. 



2 A case of this kind once came under the observation of Mr. 

 Hardy ; another is recorded in " Science Gossip,'' 1873, P- ^9o> ^^^ 

 see also " Nature." xxv. (1882), 529-30. 



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