298 Rev. R. T. Lowe o?i Melampus, 6)C. 



July 22. Sickly one dead and putrid ; the other quite healthy. 



24. The surviver quite healthy ; water changed. 



July 27. Ditto ditto. 



30. Ditto ditto. 



August 3. Ditto ditto. 



10. Ditto ditto. 



16. Ditto ditto. 



26. Ditto ditto. 



30. Ditto ditto. 



31. I went from home, leaving it in the care of a friend. 



Sept. 17. Water changed; the animal heing alive. A few days after 

 this, the water was observed to be cloudy, and the 

 animal was found dead and putrid. 



This is quite conclusive ; and the animal's surviving so long as 6, 7,. 

 and 1 days without even a change of water, leaves not the smallest 

 possibility of cavil. Yet this is the last of a series of experiments so 

 similar in every point to Nos. 1, 2, 3, 8, 9, 10, 11, 12, and 13 of those 

 above recorded of the Melampodes, that it is only necessary to substitute 

 the word Pedipes for Melampus in them as they stand. Pedipes has 

 the same habit of remaining fixed above the surface of the water, and of 

 crawling out of the glass if left at liberty to do so ; has a precisely 

 similar orifice in the mantle on the right side, which it opens when taken 

 out of the water ; has always the air-bubble at the mouth of this orifice 

 when beneath it ; and except in one instance (Experiment 1 4) has always 

 died on the third or fourth day of confinement below the surface. Setting 

 then aside one instance, there is no stronger reason to prove that Pedipes 

 belongs to the Pectinibranchia than that Melampus does. Yet this single 

 instance fortunately removes all farther question as to Pedipes : and all 

 this serves to corroborate the same decision respecting Melampus. 



Ferussac enumerates four speciesof Pcrfipcs; but his third, Ped. OvuluSy 

 seems from his short remarks upon it scarcely to belong to the genus ; for 

 he describes it as smooth and polished, and wanting the internal rib or 

 double tooth within the outer lip. In Mr. Sowerby's rich cabinet, I have 

 also seen two species of the genus, both apparently distinct from Ped. afra; 

 and these, as well as the rest of Ferussac's species agree in the presence 

 of the spiral strice, and the rib -like tootli or fold inside the outer lip. 



