CANARIAN GROUP. 329 



and which were taken by myself (from beneath the bark of a 

 rotten tree) in the sylvan district of El Grolfo on the western 

 slopes of Hierro, the P. concinna differs from the textilis, 

 merely, in its transverse costse being rather less raised or de- 

 veloped, in its ultimate volution being just appreciably wider, 

 and its umbilicus being a trifle larger or more open. Its spire, 

 too, is, if anything, just perceptibly more depressed. In colour 

 it would seem to be either of a pale reddish brown, or else of a 

 still paler albino-yellow. 



Patula putrescens. 



Helix putrescens, Lowe, Ann. Nat Hist. vii. 104 (1861) 



Pfeiff., Mon. Hel. v. 143 (1868) 

 Patula putrescens, Mouss., Faun. Mai. des Can. 23. pi. 1. 



f. 48-50 (1872) 

 Helix putrescens, Pfeiff., Mon. Hel. vii. 144 (1876) 



Habitat Palmam ; a meipso in sylvaticis editioribus, sub- 

 truncis arborum putre scent ibus, detecta. 



The present Patula, like the P. Pompylia and textilis, has 

 been observed hitherto only in the wooded districts of Palma,-^- 

 where it was met with by myself, abundantly, beneath the trunks 

 of decaying trees and pieces of rotten wood, in the Barranco de 

 Galga. It differs however from those species in its larger size, 

 darker, coffee-brown hue (although it has an occasional albino 

 variety or state), more open umbilicus, more shining surface, 

 and less costate sculpture, its volutions (which are fewer, and 

 which, in spite of the spire being much depressed, are extremely 

 convex) being merely striated transversely with irregular sub- 

 confluent hair-like lines. The larger examples of the H. putres- 

 cens are about 4^ lines across, in the widest part. 



Patula engonata. 



Helix engonata, Shuttl., Bern. Mitth. 139 (1852) 

 Pfeiff., Mon. Hel. iii. 114 (1853) 



Patula engonata, Mouss., Faun. Mai. des Can. 23. pi. 2. 



f. 1-4 (1872) 

 Helix engonata, Pfeiff., Mon. Hel. vii. 211 (1876) 



Habitat Teneriffam; juxta oppidulum Garachico, raris- 

 sima. 



The P. engonata may be regarded as one of the representa- 

 tives at the Canaries of the common European P. rotundata, 

 with which in size, colour, and sculpture it is almost coinci- 

 dent. It differs, however, essentially, from that species in the 

 conformation of its very much larger umbilicus, ^which is not only 



