4 8 



THE BRITISH NATURALIST. 



[March 



Vivipanis viviftarus, L. — Common in many parts of the Trent ; 

 also found in the Soar ; and more or less plentifully in most of the 



canals. 



Genus Bythinia, Gray. 



Bythinia tentaada, Jeff. — Generally distributed and plentiful. 



Var. excavata, Jeff. — In the canal at Worksop. Found plentifully 

 by Mr. Musson and myself. 



Mons dec olla turn, Jeff. — Lenton (Lowe) ; canal at Worksop (Musson). 



Bythinia leachii, Shepp. — Occurs, in company with the last species, 

 in many localities, generally in small numbers. In a ditch communi- 

 cating with the Trent at Dunham Bridge, I once took this species by 

 hundreds, B. tentaculata being comparatively scarce ; in the following 

 year the two species were about equally abundant. 



Family VALVATIDiE. 



Genus Valvata, Mull: 



Valvata piscinalis, Mull. — Very widely distributed. I have before 

 me a long list of localities, including rivers, streams, canals, ponds, &c. 



Var. depressa, C Pfr. — Nottingham Meadows (Lowe) ; Clumber 

 Lake, Bawtry, &c. (Musson). 



Var. albina, Taylor. — " A white variety, Trent Pond, and Clum- 

 ber " (Musson, in note book). 



Valvata cristata, Mull. — Occurs rather sparingly in several localities. 



NATURALISTS OF THE DAY. 



XIV.— JOHN A. CLARK, F.E.S., M.P.S., L.D.S., Eng. 



President of the City of London Entomological and Natural History Society. 



The illustration accompanying our present issue is an excellent 

 portrait of Mr. J. A. Clark, of London Fields, ' Hackney, N., whose 

 efforts in connection with the formation and encouragement of 

 Natural History Societies in the Metropolis fully entitle him to rank 

 as a leading naturalist of the day. 



Mr. Clark was born within the sound of Bow Bells, namely at 

 Aldermanbury, in the -City of London, in November, 1842, and may 

 thus be considered a true-born Cockney. At that time the dimensions 

 of our great city were comparatively circumscribed, and when the 

 Clark family removed to the suburb of Homerton, the latter locality 

 was essentially a countr}- place, the green fields and shady lanes in 

 the neighbourhood affording good hunting grounds for the entomoio- 



