Terebratula costaia. — Turbo carneus. 7f) 



Serpula co7icamerata, Mont, is also attaclicd to Delesseria 

 alataiwm Appiu. The fact of the two latter shells beuig attached, 

 has however been long noticed. 



Terebratula costata, Zool. Journ. ii. p. 105. t. 5. f. 8, 9, 9/;, 

 may possibly be T. aurita of Fleming's Phil, of Zool. ii. p. 493. 

 t. 4. f. 5.; though it must be confessed that a comparison of its 

 characters with the description of that shell in the work referred 

 to, previous to the publication of T. costata, did not appear to 

 warrant such an idea. It is much to be regretted that this circum- 

 stance was not stated at the time, and the reasons for considering 

 it distinct. .At the present moment 1 have not the book to refer 

 to; but Dr. Fleming's opinion is certainly of the greatest weight. 



I place full reliance on Mr. Gray's accuracy with regard to 

 Turbo carjieusy Zool. Journ. ii. p. 107. t. 5. f. 12, 13, 136., whose 

 identity with Margarita striata, Leach, in App. to Ross's Voyage, 

 seems not to be questioned. In this case also, I have unfortunately 

 not been able to verify the fact by a reference to the book itself; 

 but no doubt remains of the truth of Mr. Gray's remark. 



In answer to his query, why is this shell placed in the genus 

 Turbo of Lamarck, rather than in Trochus, it should be recol- 

 lected, that the round horny operculum is not made by Lamarck 

 the characteristic of c///ier genus; and therefore the presence of 

 one in T. carneus does not forbid its being referred to the former, 

 "which, moreover, contains many species having undoubtedly a horny 

 one. Besides, Lamarck's generic character of Trochus, " aperture 

 depressed transversely, and shell conical," by no means answers 

 to this shell. No "removal" has certainly been made by me 

 " of the other species ; " as it had been described by other authors 

 long before, under the name of Turbo Margarita. It is also evi- 

 dent, that, though in referring T. carneus to Turbo (merely how- 

 ever provisionally, and on account of its near affinity with T. Mar- 

 garita of Mont.), a synonym may have been added eventually to 

 the nomenclature in respect to this species, — had it been referred 

 to Trochus, the same must have happened in respect to the other, 

 T. Margarita; since this surely belongs to the same genus as 

 T. carneus, whatever that may ultimately prove. The less evil 

 was therefore chosen, in referring to Turbo what was considered 

 a new species, rather than removing from that genus an old- 



