PHYLLOBRANCHIA. TURBONID®. 179 
2. Natica LAMARCKIANA. 
N. testa fuscescente, nigro-fusco, aut nigricante-pallido, spi- 
raliter maculata. 
Habitat in mari Cambriensi et Hibernico Australi. Mus. 
nost. in Mus. Brit. 
Shell pale fuscous brown, spirally spotted with deep fuscous 
brown or pale black. Height five-eighths of an inch. 
Inhabits the Welsh sea and the southern coasts of Ireland. 
Some specimens of this species were given to me by Miss 
Hutchings, of Bantry. I afterwards found other specimens in 
Dingle Bay, and afterwards at the Mumbles near Swansea. I 
have named this elegant species in honour of my kind-hearted 
and excellent friend le Chevalier de Lamarck, who first sepa- 
rated this genus from Nerita. 
3. Natica BROWNIANA. 
N. testa semipellucida, czerulescente-alba; anfractibus strio- 
lis, transversis, curvatis sculptis. 
Nerita glabrissima, Brown, Trans. Wern. Soc. i. 532. t. xxiv. 
ft? 
Nerita sulcata, Turt. Conch. Dict. 124. t. xiv. f. 56, 57. 
Habitat in mari Hibernico. Mus. Dr. Goodall et Capt. 
Brown. Alt. 4 unc. 
Shell semitransparent, bluish-white, the whorls sculptured 
with transverse, narrow, curved lines. Height four-eighths of 
an inch. 
Inhabits the Irish sea. 
I am indebted to Captain Brown for his kindness in per- 
mitting me to describe this species from a specimen which he 
afterwards gave to Dr. Goodall. 
Genus 79. NERITA. 
Nerita Lamarck. 
Testa spiralis, gibba, subtis plana. Apertura semiorbicu- 
laris. Peritrema planum. 
Animal ore rostrato, moderatim elongato, cylindrico. Ten- 
