Descriptive Catalogue of the British Testacea.. 169 
Habitat, rarior, in aquis dulcibus, confervis adhzerens. 
Testa diametro } poll. tenuis, pellucida, colore corneo. infractus tres 
teretes, leviter cohzerentes, minutissime longitudinaliter - striati. Um- 
_Uilécus patulus usque ad apicem. Apertura circinata. 
Muller has probably described this shell in two 
places; and Gmelin has not only continued this error, 
but has given the same species a third time, as a Heliz, 
` with a reference to Schróter's figure. 
27. 
Nautileus.T. testa planiuscula ; anfractibus annulatis, dorso cris- 
dg. £4. latis. Linn. BAT. Nat. p. 1241. n. 654. Linn. Gmel. 
p. 3612. — Merger oa 
— Linn. Syst. Nat. 10. p. | 109. n. . 934. Nautilus Crista. 
wt ext MO Helo. 4, p. 212. 4.9, f. 21, 29;- ae TE Meas ely 
Walker Test. Min. Rar. f. 20. § 21. 
. Muller Verm. 2. n. 351. _Planerbis imbricatus. 
Schrot. Flussconch. p- 238. n. 50. 
Chemn. Conch. 9. t. 193. f. 1077. A. a. 
Adams Micr. t. 14. f. 10, 11.; & t. 22. f. 39. 
Montagu Test. Brit. p. A64. H. nautileus. 
E —— ———— Supplem. t. 95.4.5... t 
20 o5 Pulteney in Hutch. Dorset. t: 19. 3. 16. be- 
- Habitat in aquis dulcibus, pinge p adhzrens.- docola pallidus, 
— tentaculis duobus setaceis. : | 
Testa damain daol, pellucida, pallide cornea, sub e idermi Enos abs. 
/ ^ Jus umbilicata, Anfractuum annuli nune manifesti, nunc fere obso- 
<< Teti, nunc- spinis seu ristis dorsalibu 2: 
First Bigubed aa ficii 
and ditches. = 
Walker. Found in ponds 
98. e í, r; 
cristatus. T testa supra planiuscula, subtus umbilicata; anfracti- 
: bus 3 vel 4, teretibus. _. auf | 
Muller Verm. 2. p. 198. n. 384. Valvata te w 
YOL. VIIL Z P o Walker 
