188 es Dr. Maton’s and Mr. RACKETT'S 
zs 
subeavi- H. testa umbilicata, striata, convexiuscula, anfractibus 
nata.  lineotis 3 elevatis delicatissimis. 
Walker Test. Min. Rar. f. 22.? 
Montagu Test. Brit. p HAS t. EXE Ae 9. 
Habitat in mari, rarior. 
Testa diametro ad basin +; gne satis crassa, alba, aun Anfractas 
8, subtilissime transversim striati, superné lineola. unica elevata delicatis- 
sima, subtus lineolis duabus, Apertura ovalis. Margo integerrimus, 
versus anfractum seeundum in angulum acutum decurrens, Umbilicus 
profundus. Testa Neritis valde affinis. (Montagu.) 
Found on the coasts of Kent and ji enemies 
a. x 
Planorbis.H. testa subcarinata, zai Raat plana, supra concava, 
t. 5. f.18. apertura oblique ovata, utrinque acuta. Linn. Fauna 
Suecica, n. 2. Syst. Nat. p. 1242, n. 662. Linn. Gmel. 
p. 3617. 
Lister Anim. Angl. t. 2. Í. o7. Conch. t, 138. f. 42. 
: Act. Angl.. n. 105. t. M DI TET ONT 
Petiver Gaz. t. 10. fA... amori 
Gualt. Test. t. 4. f. E.E. 
Klein Ostr. t. 1. f. 8. — Ka 
Hill Swammerd. t. 10. f. 5. 
Muller Verm. 2. p. 160. n. 346.? Planorbis umbilicatus. 
Pennant Brit. Zool. t. 83. f. 123. 
Da Costa Brit. Conch. p. 63. t. 4. f 10.; §& 48. ^ 8. 
| Schrot. Flussconch. t. 5. f. 13. 
cores Favanne Conch. t. 61. f. Bob. 
© Chemm. Conch. 9. t. 126. f. 1102: a—b. — — 
‘Pult. in Hutch. Dorset. p. AG. t. Bef Bugt. 20. f 10. 
Montagu Test. Brit. p. 4 ( : 
Habitat in stagnis; frequens. — noc xi Bo Jg e 
5 -Testa constat 4 anfractibus RSRS dum animal intra eandem latet 
opaca, —— e pestem mm fpi: Stric minimae 
oblique 
