812 TESTACEA ATLANTICA. 



tided occurs in Grand Canary; nevertheless, considering the 

 confusion which existed, at the time of the publication of their 

 catalogue, in the nomenclature of the Testacellas, and bearing 

 in mind also the extreme looseness of many of their determina- 

 tions, I cannot but agree with Mousson in doubting the pro- 

 priety of admitting this species, without further evidence, into 

 the fauna of the archipelago at all. Nevertheless since it 

 has occurred undoubtedly at Madeira (perhaps imported acci- 

 dentally from more northern latitudes), I will not absolutely 

 expunge it from the Canarian list. 



Genus 4. PARMACELLA, Cuvier. 



Parmacella calyculata. 



Parmacella calyculata, Sow., Gen. of Shells, f. 103 (1823) 

 Cryptella canadensis, W. et B., Ann. ties Sc. Nat. 28 syn. 



110 (1833) 

 „ ambigua, cVOrb. [nee Fer.'], in W. et B. Hist. 50. 

 t. 1. f. 1-12 (1839) 

 Parmacella calyculata et auriculata, Mouss., 1. c. 8. t. 1. 



f, 1-3 (1872) 



Habitat Lanzarotam et Fuerteventuram ; hinc inde in mon- 

 tibus haud infrequens. 



After a very careful comparison of a long array of indi- 

 viduals of this Parmacella, collected by Mr. Lowe and myself 

 in Lanzarote and Fuerteventura, I have come to the conclusion 

 that Webb and Berthelot were correct, as well as d'Orbigny, in 

 recognizing but a single species, found in those two eastern 

 islands of the Group, and consequently that Mousson's P. auri- 

 culata cannot be looked upon as more than, at the utmost, 

 a very slight and unimportant insular phasis, peculiar to 

 Fuerteventura, of the P. calyculata. Indeed the few diag- 

 nostic characters which he gives (and he himself says of them 

 4 sont a la verite faibles ') seem to me to be absolutely untrace- 

 able in the majority of the examples which are now before me, — 

 all that can be said of the Fuerteventuran ones being that they 

 have their spatula, on the average, a trifle shorter and more 

 solid (or thickened) than is the case in those from Lanzarote, 

 the mere result in all probability of their having been matured 

 on a still drier and more calcareous soil. I will, however, so 

 far recognize their distinctions as to cite them as representing 

 a ' var. /3. auriculata.'' 



This Parmacella, which we found more common in Lanza- 

 rote than in Fuerteventura, occurs, so far at least as my own 

 experience would imply, at a rather lofty elevation ; though it 



