of North American Helicidce. 113 



adds to the synonymy of H. ohstricta Say's var. a. oiH. ijalliata^ 

 considering that the descriptions agree. The name H. denotata 

 appears in Ferussac's Prodromus. In the Histoire, PL 50, tig. 

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

 cation des Planches it is erroneously called 11. appressa Say. 

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

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

 (Mon. Hel. Yiv.) has H. Carolinensis in the synonymy of //. 

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



I have now quoted everything of any moment which has 

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

 diately allied to H. palliata. 



There can be no doubt as to the H. palliccta 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 H. helicoides. Say gives Ohio as the habitat of the 

 two first, which increases the difHculty, 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 H. 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 S. helicoides to var. a. instead of to II. 

 ohstricta. 



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

 certainly consider it identical with H. helicoides as Jlgitred by 

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

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

 very-prominent, and reinarkohle. In II. helicoides ihe, 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 Say. Under these 

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

 coides in the synonymy of H. ohstricta. 



H. jpalliata, var. a., is described by Say as having a very pro- 

 minent acute carina, and destitute of minute prominences. 



