CANARIAN GROUP. 311 



que inferioribus parce occurrens. In Canaria Grandi etiam 

 semifossilis, juxta Tafira, cepit Kevdus. R. B. Watson. 



It was from Canarian examples that the T. Maugei was 

 originally described ; nevertheless the species does not appear 

 to be very abundant in the archipelago, nor am I aware that it 

 has been observed hitherto except in Grand Canary and Tene- 

 riffe. Indeed it is far from impossible that it may have been 

 naturalized in these islands ; though since an example which is 

 now before me, and which was met with by Mr. Watson near 

 Tafira in Grand Canary, is unmistakeably subfossilized, there is 

 at least presumptive evidence that it is truly indigenous. It is 

 found likewise in the Madeiran and Azorean archipelagos, as 

 well as in central and southern Europe and northern Africa. 



The shell of the T. Maugei is rather thick, ancyliform, and 

 robust ; and externally it is opake and more or less eroded and 

 decorticated, of a pale yellowish-olivaceous hue, and with the 

 lines of growth irregular but conspicuous, a few of them, 

 which are usually more or less filled up with a brownish 

 deposit, being deeper and coarser than the rest. Internally, 

 however, it is whitish, shining, and pearly, reflecting sometimes 

 a faint opaline lustre ; and its aperture, which is enormous and 

 oblong, has its curvature a little interrupted by a slight sinuo- 

 sity, or emargination, at the upper angle of the outer lip. 



The animal, which tapers anteriorly and is unprovided with 

 a shield, is of a livid-black, with the edge of the pedal disk (as 

 seen from above) of a pale salmon colour which shades-off 

 gradually, by means of a number of minute specks, into the 

 darker upper-surface. It is much roughened with irregular 

 grooves or coarse reticulations, and carries its limpet-like shell 

 (which covers the respiratory orifice) immediately above its 

 apical region. 



Testacella haliotidea. 



Testacella haliotidea, Drap., Tabl. des Moll. 99 (1801) 



Lowe, Cambr. Phil. S. Trans, iv. 40 



(1831) 

 W. et B., Ann. des Sc. Nat. 28. syn. 



(1833) 



d'Orb., in W. et B. Hist. 49 (1839) 



Lowe, Proc. Zool. Soc. Lond. 163 



(1854) 



,. , Paiva, Mon. Moll. Mad. 5 (1867) 



Mouss.,Faun. Mai. des Can. 1 1 (1872) 



Habitat ' Canariam Grandem ' (sec. Webb et Berthelot) ; 

 mihi non obvia. 



According to Webb and Berthelot the European T. halio- 



