45i0 Notes on Animals in small Aquaria, 



cotties, gobies, and those creatures which delight in very shallow 

 water, or which have the power of climbing out of their liquid 

 element. The varieties I have myself kept in perfect health for the 

 period mentioned are crabs, blennies, gobies, cotties, and varieties of 

 Actinia. Cancer Msenas has under these circumstances cast its skin 

 three times during the present year, having increased in its dimen- 

 sions most extraordinarily each time. 



Memorandum 3. — The form of aquarium which, after upwards of 

 five years' experience and observation on the natural habits of the 

 various animated tenants, I have now adopted, consists in a four-sided 

 vessel having the back gradually sloping upwards from the bottom at 

 an angle of 45 to 50 degrees, and the consequently extended top 

 sloping slightly downwards and resting on the upper part of the back. 

 The bottom, therefore, becomes necessarily narrow. The front for 

 the purposes of observation, and the top for the admission of light, 

 are to be of glass ; the back, ends and bottom being constructed of 

 slate ; the whole fixed in a stout framework. 



The advantages of this arrangement are : — 



First. That it allows of a most extended view of the whole interior 

 of the aquarium. 



Secondly. That it enables the occupants to resort to water of any 

 depth they may desire, or even to ascend the sloping back and 

 emerge from the water. 



Thirdly. It admits of a much larger surface of water being exposed 

 to the action of the light ; and 



Fourthly. The sloping top allows the water which condenses on 

 the glass, from the effect of radiation, to trickle off and return to the 

 aquarium without first resting on the zinc or iron frame-work. 



I need hardly mention that the sloping back is to be covered 

 with light rock-work extending to a short distance above the water- 

 line. 



Robert Warington. 



List of Land and Fresh Mollusca found in the neighbourhood of 

 Banbury, Oxfordshire. By Richard Stretch, Esq. 



The nomenclature of this list is that of Gray's ' Turton's Manual.' 

 Neritina fluviatilis. Not uncommon in the Cherwell, but small. I 

 collected about two dozen specimens in a few minutes. Turton (page 

 33) limits this species to the southern part of the island ; but I have 



