S60 THE ZOOLOGIST. 



that the Common Prawn [Palamon serratus) and the Shrimp [Crangon 

 vulgaris) are very hardy inhabitants of an aquarium, whereas the 

 iEsop Prawn [Pandalus annulicornis) is very delicate. Two observa- 

 tions upon this point may be given : — (1) On March 19th several 

 iEsop Prawns were brought from the seaside in the same collecting- 

 can with about an equal number of Common Prawns. Both kinds of 

 Prawns were subjected to the same conditions during capture in the 

 dredge and carriage home in the can, and both kinds were put into 

 the same tank. Within a few days all the iEsop Prawns were dead, 

 the majority of them apparently dying from the effects of the journey, 

 whilst the others were killed and eaten by the Common Prawns. 

 Some of the latter are still (July 17th) alive. (2) On May 19th six 

 Common Prawns, twenty-seven iEsop Prawns, and thirty Shrimps 

 mixed together were brought in two collecting-cans from the sea- 

 side. At the end of the five hours' journey it was found that none of 

 the Common Prawns and only two of the Shrimps were dead, but 

 that twelve iEsop Prawns had died. The six Common Prawns were 

 put into one tank, and four of them are still (July 17th) alive. The 

 iEsop Prawns and Shrimps were put into another tank. By the end 

 of May all the iEsop Prawns were dead, with the exception of one 

 individual which lived until the middle of June, most of them 

 apparently dying from the effects of the journey, and some of 

 them being killed and eaten by the Shrimps. All the Shrimps are 

 still alive. As an example of the hardiness of the Shrimps, it may be 

 recorded that when they were being dropped into their aquarium on 

 the night of the 19th, one of them happened to fall upon a dead 

 iEsop Prawn, which it straightway began to eat. A few minutes 

 later another Shrimp had begun to eat another dead iEsop Prawn. 

 The experiences of other aquarium-keepers on this point would be 

 interesting, — H. N. Milligan. 



I N S E T A. 



Acanthocinus sedilis at Sydenham. — On July 21st Mr. W. A. 

 Fowler, of Sydenham, submitted to me for identification a living 

 male individual of the beetle known as Acanthocinus cedilis. j Mr. 

 Fowler explained that he had found the beetle " in a sack of sugar 

 exported from the West Indies," and that it had come over in a boat 

 carrying a general cargo. — H. N. Milligan. 



Errata.— Page 317, line 19 from bottom, for four eggs read five. 



