PUNCTURELLA. HALIOTIS. 255 
PUNCTURELLA, Lowe. 
P. noacuina, Linnzeus. 
P. noachina, Brit. Moll. ii. p. 474, pl. 62. f.10, 11, 12; (animal) pl. 
B.B. f.4, 5, 6. 
This Puncturella is a northern and Scotch species, and I 
believe has not occurred on the southern coasts; I therefore 
refer for all that is known of it to the ‘ British Mollusca,’ 
vol. ii. p. 474, which contaims an excellent description of the 
shell and animal. 
HALIOTIS, Linneus. 
H. rusercutata, Linn. et Auct. 
H. tuberculata, Brit. Moll. ii. p. 485, pl. 64; (animal) pl. C. C. f. 3. 
This species is the only one of the genus, and cannot be 
strictly considered indigenous ; it appears to be admitted in 
the list as an inhabitant of Guernsey, our ancient contiguous 
dependency. That the eminent French zoologists and com- 
mentators on Lamarck should have stated that Haliotis has 
the closest alliance with the Trochi, is so extraordinary, and, 
as I think, so contrary to fact, that I could scarcely believe 
I had read right. Naturalists, after they have examined 
this comparative statement, will judge where the error lies. 
I set out with the invocation, “Cuvierum legitote!” That 
illustrious anatomist says, ‘On pourrait presque dire que la 
Fissurelle est un Haliotide ; and of course vice versd, I think 
it will be shown that Haliotis and Trochus are considerably 
removed from each other. 
This genus presents the first evidence of departure of that 
symmetry in the shell, which has hitherto characterized this 
portion of the Gasteropoda ; and in the remaining genera of 
the group, either in the shell or animal, marks of the non- 
symmetrical structure will appear, which will henceforth be- 
come more and more developed, until the termination of the 
class. 
Though Haliotis has abandoned the strict patelloid form, it 
still, by the animal, declares the closest relationship with Fis- 
surella. 
