Y7 



last wliorl subinflatcd, aperture ovate, disjoined from the last 

 whorl. Length, 3 ; breadth, 1 mill. 



Habitat, Jordan Eivcr, near Brighton. Augustus Simson. 



A very distinct but small species, with the whorls some- 

 times almost entirely separate. 



3. BvTHixiA DULVERTOXENSis, n. s. B. tcsta turhinato-conica, 

 fnlva, epidcrmide alba, spira obtusa, anfradibus (G) rotuiulntis ; 

 apcrtura ovata, snpcrnc angulata, Integra, ab aitfractu distincta, intus 

 albida. 



Shell turbinately conical, fulvous, with a white epidermis ; 

 spire obtuse, whorls (»>) rounded, aperture ovate, angulated 

 above, entire, distinct from the whorl, whitish within. Length 

 3 ; breadth 2 mill. 



Habitat, Lake Dulverton. More turbinate than any of the 

 preceding species. Under the microscope the epidermis is 

 found to consist of small, oval, silvery scales. 



4. Bythinia huonensis, 11. s. B. testa elongata, pyramidata, 

 attenuafa, famoso-cornea, nitida, epidermide fusca; spira elcvata 

 acuminata, anfractibus (S) vix obliqnis, duobus apicalibus aliquando 

 subinjlatis, apcrtura pyriformi ; labio interna rcfiexo. 



Shell elongate pyramidal, attenuate, smoky horn, shining, 

 with a blackish epidermis ; spire elevated, acuminated, 

 whorls (8), scarcely oblique ; the two apicial sometimes in- 

 flated, aperture pyriform ; inner lip reflected. Length 4. 

 Breadth 1^ mill. 



Habitat, Huon Eiver. A very distinct and interesting 

 species, with a pyramidal habit. 



5. Bythinia unicarinata, n. s. B. testa elongato-conica, tenui, 

 semi-pellucida, fumoso-curnea, anfractibus (0) rotandatis, duobus 

 tdtlmis unkarlnatls, carina Intcrrupta ; apcrtura ovata, integra 

 crassiuscula. 



Shell elongately conical, thin, semi-peliucid, smoky horn, 

 whorls (6) rounded, two last with one interrupted keel; 

 aperture ovate, centre somewhat thickened. Length 4. 

 Breadth U mill. 



Salmon Ponds — Not common. 



6. Bythinia dunrobinensis, n. s. B. testa elongato-pyrimidata, 

 tenui, pcllucula, albida, epidcrmide paUide rufa vel atra maculata ; 

 anfractibus (6) pla)iatis regulariter decrescentibus ; spira obtusa; 

 apcrtura pyriformi, integra; labio interno superne reflexo. 



Shell elongately pyramidal, thin, pellucid, whitish, spotted 

 with pale or black epidermis; whorls (G) regularly decreas- 

 ing ; spire obtuse, aperture pyriform ; inner lip reflected 

 above. Length, 3 ; breadth, 1 mill. 



The Ouse near Dunrobin. A pale narrow shell longer and 

 more slender than any of its congeners. 



7. Bythinia tasmanica, n.s. B. tcsta tarblnato-conlca, solidius' 



