156 ASHP'ORD : LIST OF CHRISTCHURCH MOLLUSCA. 



P. carinatus. — River Avon at Christchurch ; Winkton and 

 [Ringwood] ; R. Stour, Tuckton ; [Holmsley] ; in places 

 plentiful. 



P. marginatus (Drap.). — Frequent in most places round 

 Christchurch, in R. Stour, R. Avon, ditches and marshes ; 

 [Holmsley, Brockenhurst]. Of examples from the Avon 

 Mr. Nelson remarks : " a rather curious form with very 

 compact whorls." 



P. corneus. — In ditches near the Avon, Christchurch. 



P. contortus. — Local. Abundant in a brook, Somerford, 

 with jP. albiis and P. nautileus ; [Holmsley]. 



Physa hypnorum. — Only two examples, in ditches near 

 Christchurch. 



P. fontinalis. — Numerous and generally distributed round 

 Christchurch in Avon, Stour, smaller streams, ditches, and 

 marshes ; [Brockenhurst, Ringwood]. Some variation in 

 shape approaching oblonga and inflata. 



Limnaea peregra. — Our most abundant aquatic species, 

 occurring in both rivers, but preferring quiet ditches. 

 Christchurch, Wick, Tuckton, Iford, Blackwater, Wink- 

 ton, Sopley, Mudeford, [Ringwood, Holmsley, Brocken- 

 hurst]. Fry innumerable in May, no adults to be found 

 after June. Prevailing form in ditches is intermediate 

 between ovaia and acuminata, attaining 21 rnm., a few 

 tending to each extreme ; in the rivers more nearly typical. 

 A dwarf form, 7 — 10 mm. {jnaritima),va. the mineral stream, 

 Boscombe Chine. [To the last named variety may perhaps 

 be referred a small russet-brown form, 10 — 12 mm., found 

 alive in a dry cattle trough at Beaulieu]. 



L. auricular! a. — Christchurch, in both rivers, seldom found 

 adult and never fine. 



L. Slagnalis. — Christchurch, in R. Stour, ditches near R. 

 Avon, rarely adult. 



L. palustris. — In most waters near Christchurch, abundant in 

 places, adults varying from 15 to 20 mm. Also at Boscombe, 



J.C, v., Jan., 1887. 



