300 Rev. R. T. Lowe on Melumpus, &c. 
designated it in my MSS. by the generic name of Erpetometra; derived 
from its peculiar manner of crawling. This appellation I had since 
purposed changing into Truncatella: the very name by which I find the 
self-same species designated by Risso, in his Histoire Nat. &c. de Europe 
Meridionale, In this work, however, the genus rests, like very many 
others of the same writer, on most unsubstantial grounds; the animal 
g__ being entirely neglected. The name therefore being settled by Risso’s 
priority in publication, nothing remains but to supply the last mentioned 
deficiency ; and to indicate the species that will probably be found to 
agree in the above characters. 
The following extracts are made more with the view of confirming the 
marine nature of Melampus, than to settle the question in respect to the 
present genus; whose proper abode does not seem to have been so much 
a subject of doubt. 
Experiment 15. 
April 28, 1827. A single specimen of Cyclostoma truncatulum, 
Drap., found alive on the north coast of Ponta Saé Laurenco, 
under large stones on the beach, a little below high-water 
mark; in company with specimens of Melampus equalis, 
Mel. exiguus, and Pedipes afra. Within the aperture on 
the right of the neck, as the animal is crawling, there is an 
air-bubble, 
Experiment 16. 
June5, Having opened to-day the small tin box in which I had 
deposited on April 30 this same shell, together with a 
number of specimens of Melampus equalis, Mel. exiguus, 
and Pedipes afra fouud with it, on placing them all in a 
glass of sea-water, to my great astonishment the animal of 
this specimen began instantly to protrude itself, and crawled 
actively about the glass. Itdoes not seem to have suffered 
in the least from its long confinement without water. All 
the others are quite dead. <* Is it then a Pulmonia?” MSS. 
The following statement sufficiently negatives this last question. 
Experiment 17. 
June 9, 1827. I inclosed this same specimen in a small lace bag, 
previously soaked to exclude any air-bubbles, and immersed 
