OF CONCHOLOGY. 43 



Mr. Lea upon instituting the genus lo re-named theJiuviaUs 

 as fusiformis, Lea, in accordance with a custom, very usual 

 among naturalists, but very disreputable. He has recently 

 done Mr. Say and himself the justice of restoring the original 

 name, — -an example worthy to be followed. 



The verrucosa of Eeeve is founded on a beautiful specimen, 

 but presents no claims to rank even as a variety. 



2. lo iNERMis, Anthony. 



Plate 3. Fig. 4, typical ; fig. 5, lurida, Anthony. 



This is a very distinct species, being larger and of heavier 

 texture than Jiuvialis. The lurida differs only in color, being 

 much darker. Mr. Anthony perfectly agrees with me in con- 

 sidering it identical with inermis. 



This shell is rather rare compared \f\i\\ fiuvialis and spinosa, 

 though Mr. Anthony states that he has observed some hun- 

 dreds of them. 



lo inermis was first published in the Proceedings of the 

 Academy of Natural Sciences, 1860, and lurida in Eeeve's 

 Monograph. 



SPIXOSE SPECIES. 



3. lo spiNosA, Lea. 



Plate 4. Fig. 7, typical ; fig. 8, gibbosa, Anthony ; fig. 9, recta, Anthony. 

 Plate 3. Fig. 6, rhombica, Anthony. 



This species, originally described acd figured in vol. v.. 

 Philosophical Transactions, has been well known to Concholo- 

 gists for many years. The three synonyms were first pub- 

 lished in Reeve's Monograph. 



lo recta is a variety of very usual occurrence, and does not 

 in any respect present distinct specific characters : rhombica is 

 merely a half grown shell of the same general form. 



Mr. Reeve in describing gibbosa, says, " The gibbous ridge 

 which encircles the lower part of the , body whorl of this 

 species, ' is not,' writes Mr. Anthony, ' a mere accidental abbera- 

 tion, I have seen others like it.' " 



The extensive suite of specimens that I have examined con- 

 vinces me, nevertheless, that the gibbous ridge is " a mere ac- 

 cidental abberation," being found in all stages of development 

 on specimens ofsjnnosa which are otherwise distorted in growth, 

 but never on perfect, well grown specimens. 



4. lo BREVis, Anthony. 



Plate 4. Fig. 10, typical; fig. 11, spirosloma, Anthony. 



This heavy short species offers many points of difference 

 from lo spinosa. 



The texture, form, short wide channel and broad obtuse 

 spines are all prominent, distinctive characters. Mr. Anthonv 



