510 TEST ACE A ATLANTIC A. 



This widely-spread Mediterranean Stenogyra has recently 

 been detected, for the first time, in the Cape- Verde archipelago 

 by M. de Cessac, who met with it, according to Morelet, both 

 in S. Nicolao and Boavista. No traces of it were seen by either 

 Mr. Lowe or myself, in any of the six islands of the Group 

 which we visited ; but Boavista, at all events, was one of the 

 three which we had no opportunity of exploring. And it 

 appears to have been equally overlooked by Dohrn. In all 

 probability however it has become naturalized accidentally at 

 the Cape Verdes, as it seems to have been at Madeira. In the 

 Canaries there is a greater appearance about it of aboriginality, 

 for in Grand Canary it exists also in a truly subfossilized con- 

 dition ; but in the Azorean archipelago, where it occurs in 

 Sta. Maria and S. Miguel, it is the opinion of Morelet that it 

 has probably been introduced (cf. ' Hist. Nat. des Apor.' 197). 



Stenogyra Goodallii. 



Helix Goodallii, Miller, Ann. of Phil vii. 381 (1822) 

 hannensis, Rang, Ann. Sc. Nat. xxiv. 41. t. 3. f. 8 



(1831) 



Bulimus Goodallii, Pfeiff., Mon. Hel. ii. 159 (1848) 

 Stenogyra sp.?, Dohrn, Mai. Bldtt. xvi, 9 (1869) 

 Bulimus hannensis, Morel., Journ. de Conch, xiii. 239 (1873) 



Habitat S. Antao, S. Nicolao, S. lago, et Brava ; hinc inde 

 sub lapidibus. 



After a very careful comparison of the minute Stenogyra of 

 the Cape-Verde archipelago, which has been identified by More- 

 let with the Helix hannensis, of Kang, from Cape Verde on the 

 opposite coast of Africa, I have come to the conclusion that it is 

 absolutely identical with the S. Goodallii, Mill., a species 

 which has been naturalized in various widely-separated coun- 

 tries, probably through the transmission of plants, and which 

 was also some years ago imported into England (where it was 

 detected by the late Mr. Miller in a garden at Bristol). I have 

 several of Mr. Miller's original types in my possession, which 

 were given to Mr. Lowe by G. B. Sowerby in 1826, and which 

 so completely resemble those from the Cape Verdes that I do 

 not think it would be possible (if intermingled) to re-adjust the 

 two sets. Like most of the Bulimi, however (and, I may add, 

 also, of the Achatinas), the species is exceedingly inconstant, 

 not only in stature but also in the precise number of its volu- 

 tions ; and I have examples from both regions (i. e. from 

 England and the Cape Verdes) which vary in the same manner, 

 those with an extra whorl having the spire more drawn-out 

 (or elongated) and a trifle more parallel, causing the former to 



