78 Rev* R. T. Lowe on Balanus punctatus, S^c. 



PUNCTURELLA. 



Char. Gen. Testa patellar is ^ vertice iniorto, vel spirally canali 

 deorsum ampliore ah apice decurrente^ in perforatione de- 

 sinente. Perforatio ohliqua ; intus fornicata^ ant quasi 

 punctura lamina fornicata instruct a.^ 



A second true species of this group, which was formerly in the 

 collection of Mr. G. Humphrey, and is marked " from the Falk- 

 land Islands," has been most kindly presented to me by Mr. G; 

 B. Sowerby. A third, he informs me, is in his brother's possession. 

 Most probably Fissurella gibberula of Lamarck belongs also here. 

 It need scarcely be added that the shell marked Cemoria Mon- 

 tagui in the British Museum, wants all the characteristic marks 

 of the genus but the more general appearance, and has no trace 

 of the canal nor of the peculiar internal structure of the true 

 Puncturellce, 



In corroboration of Mr. Gray's idea that many of the minute 

 Cephalopoda of Lamarck, are more nearly related to the Annelida^ 

 I am able to state that Nautilus crispus + of authors is certainly 

 not an internal, but an attached shell. At Appin in Argyllshire, 

 it is to be found, in the greatest abundance, attached io growing 

 plants of Delesseria alata^ and other marine hydrophytes. When 

 the animal was placed alive und^r the microscope, a few fine 

 radiating filaments appeared to proceed from the shell ; but no- 

 thing further of the nature of the animal could be ascertained. 

 More favourable opportunities, combined with patient investiga- 

 tion, may, it is to be hoped, be attended with better success. 



Mr. Clark informs me, he has frequently procured Serpula 

 lobata of Mont, alive, and that it is decidedly not an internal 

 shell. Specimens in his cabinet, ground down, still exhibit the 

 remains of the animal within the compartments of the shell. 



* Perhaps it would be better to say with Fabricius, " intus in canalem brevem 

 fornicatam producta.^' 



+ The shell when perfect is furnished with short points, set at regular inter- 

 vals round the circumference, like the pricks on the rowel of a spur. These I 

 suspect have something to do with the mode of the shell's attachment. They 

 are very easily obliterated. 



