PHYLLOBRANCHIA. TURBONIDZ. 175 
NEPTHEUSA CRASSA. 
T. testa pallidé viridescente, nigro, angulaté-undulato lineata. 
Trochus crassus, Petiver, Gaz. t. 36. f. 11; Pult. Cat. Dor- 
set. 44. t. xvi. f. 3, 7; Donov. Brit. Shells, t. lxxi.; Mont. 
Test. Brit. 281; M. & R. Trans. Linn. Soc. viii. 154; 
Flem. Edinb. Encycl. vii.; Dill. Dese. Cat. 786; Turt. 
Conch. Dict. 188. sp. 6. 
Turbo lineatus, Da Costa, Brit. Conch. 100. t. vi. f. 7. 
Habitat in mari Britannico ubiqué. 
Shell pale greenish, with zigzag black lines. Height one 
inch and one-eighth. 
Inhabits the sea. Very common on almost all the British 
coasts. 
This shell varies in colour, and is sometimes pure white. 
Genus 77. GIBBULA. 
Trochus Auctorum. 
Testa gibbosa, subconiea. Sutura profunda. Umbilicus 
apertus. Operculum tenue, corneum. Animal incognitum. 
The shell gibbous and subconical ; its suture deep; its um- 
bilicus open ; its operculum slender and horny. The animal 
of this genus is unknown. 
Synopsis Specierum. 
i. tumida. Testa anfractibus tumidis, lineis spiralibus, elevatis, 
alternatim latis et angustis, preesertim in anfractu basilari. 
2. striata. Testa anfractibus moderatim tumidis, lineis elevatis, 
transversim et in nonnullis tenuissimé impressis. 
3. lineata. Testa sutura angustissima; anfractibus subdepressis, 
glabris, politis. 
4. magus. Testé sutura profunda ; anfractibus elevato-lineatis. 
1. GIBBULA TUMIDA. 
G. testa anfractibus tumidis, lineis spiralibus, elevatis, alternatim 
latis et angustis, preesertim in anfractu basilari. 
Trochus tumidus, Pult. Cat. Dorset. t. xvi. f. 9, 10; Mont. 
