CANARIAN GROUP. 313 



is more usually to be met with, perhaps, dead than alive, 

 under which circumstances the specimens are often altogether 

 separated from (or devoid of) their spatula. It was originally 

 found by Webb in the Malpais (or ancient lava-current) of the 

 Montana de la Corona, in the north of Lanzarote ; and indeed 

 the greater number of our own examples were obtained at no 

 considerable distance from that particular spot, namely over- 

 looking the Salinas, and on the heights above Haria. It would 

 seem to have been collected also by Fritsch, in both islands. 



Farmacella callosa. 



Parmacella callosa, Mouss., Faun. Mai. des Can. 10 (1872) 

 Habitat Fuerteventuram ; a Dom. Fritsch semel tantum 

 lecta. 



A single example of a Parmacella, which was found by 

 Fritsch in Fuerteventura, was employed by Mousson to indicate 

 a new species under the name of P. callosa ; nevertheless he 

 himself appears to have had grave doubts as to whether it 

 should be regarded in reality as more than an accidental, or 

 individual, variety, shewing an unusual amount of thickening, 

 the result of age, and a chance deterioration of its nucleus. 

 'Je considere,' says he, < cette espece, jusqu'a de nouvelles in- 

 formations, comme tres sujette a caution. Le nucleus differe 

 de ceux des Parmacelles, a moins de n'etre qu'accidentellement 

 depourvu de son test exterieur ; la spatule est remplie d'un 

 depot calcaire ; le bord droit s'insere directement sur le cote du 

 nucleus, le bord gauche forme a la base du nucleus un arc plus 

 releve et dilate que dans les deux autres especes [according to 

 me, only one]. Peut-etre toutefois ces differences n'indiquent 

 elles qu'un etat senile, modifie par la deterioration du nu- 

 cleus et par des exsudations insolites.' 



Tarn. 3. VITBJNID^J. 

 Genus 5. VTTRINA, Draparnau 7 . 



Vitrina Lamarckii. 



Helicolimax Lamarckii, Fer., Prodr. 21 (1821) 

 Vitrina Lamarckii, Fer., Hist. ii. 69. t. 9. f. 9 



Teneriffse, Quoy et Gaim., Voy. de VAstrol. ii. 142. 



t. 13. f. 4-9 (1832) 

 Lamarckii, W. et J?., Ann. des Sc. Nat. 28. syn. 311 



(1833) 

 d'Orb., in W. et B. Hist. 53 (1839) 



