436 Remarks on Certain Species 



adds to the synonymy of H. ohstricta Say's var, a. ofU. paUiata, 

 considering that the descriptions agree. The name II. denotata 

 appears in Ferussac's Prodromns. In the Ilistoire, PL 50, fig. 

 7, agrees with Lea's figure of IL helicoides, but in the Expli- 

 cation des Planches it is erroneously called U. appressa Say. 

 In the Bull. Zool. (1835), Ferussac refers II. Carolinensis to 

 H. palliata, and treats H. helicoides as a variety of it. PfeifFer 

 (Mon. Hel. Yiv.) has H. Cai'olinensis in the synonymy of II. 

 palliata, and II. helicoides in that of 11. ohstricta. 



I have now quoted everything of any moment wdiich has 

 been written on the subject of the different forms of, or imme- 

 diately allied to II. palliata. 



There can be no doubt as to the II. palliata Say. It is im- 

 possible, however, with absolute certainty to identify Say's var. 

 a. and his II. ohstricta., looking at the descriptions, and his note 

 of 1834 on II. helicoides. Say gives Ohio as the habitat of the 

 two first, which increases the difficulty, inasmuch as no carinated 

 form, so far as I know, occurs in that State. 



Say, in 1824, separated II. ohstricta from var. a. \ in 1834 he 

 pronounced II. helicoides to be the latter, and did not mention 

 the former. At the latter date he erroneously referred H. 

 Carolinensis to H. apjpressa., and I believe that he was equally 

 in error in referring II. helicoides to var. a. instead of to H. 

 ohstricta. 



Judging alone from Say's diagnosis of II. ohstricta., I should 

 certainly consider it identical w'ith II. helicoides as figured by 

 Lea, who, in his description, makes no allusion to the carina. 

 Say characterizes the carina of II. ohstricta as acute., 'projecting^ 

 very prominent., and remarlx able. In II. helicoides \\\q carina is 

 certainly remarkable ; projecting from the edges of all save the 

 apicial whorls, compressed, and overlapping the suture, as in H. 

 Cumherlandiana Lea, a shell unknown to Sa3^ Under these 

 circumstances I concur with W. G. Binney in placing H, heli- 

 coides in the synonymy of 11. ohstricta. 



II. palliata., var. a., is described by Say as having a very pro- 

 minent acute carina, and destitute of minute prominences. 



