LAURIA, AZORES ISLANDS. 1-1 



Faune Malac. Canaries, 1872, p. 125, pi. 6, f. 18, 19. Repro- 

 duced in Novitates Conchologicse iv, p. 106, pi. 125, f. 18, 19. 

 — Wollaston, Testacea Atlaiitica, p. 455. — Vertigo taeniata 

 M.vr.n.i.i:. Nouv. Arch, du Museum (2) viii, 1885, p. 161. 



Wollaston considered taniata and pythiella as doubtfully 

 distinct. He writes: — 



"Judging from the few examples to which 1 have access, 

 the P. tu-niata may be said to have its volutions not quite so 

 flattened and also more strongly striated, being sometimes 

 indeed well-nigh costate. and its surface (instead of being of 

 an almost uniform concolorous brown) is of an olivaceo- 

 corneous hue, but conspicuously banded with a castaneous 

 zone (immediately above its suture) on the hinder portion of 

 each of the whorls ". 



The figure is from a specimen out of the Wollaston col- 

 lection. A callus runs from the angular lamella towards the 

 termination of the outer lip. There is a long lower-palatal 

 and a short basal fold. No upper-palatal. Length 3, diam. 

 1.65 mm., 5% whorls. 



Species of the Azores Islands. 



A key to these forms was given on p. 7:}. They are figured 

 on plate 15. 



Aside from L. cylindracea anconostoma (p. 51), probably 

 an introduced species, the Azorean Laurise fall into three 

 groups. 



1. Group of L. tesselata (Section Azoriptcpa) , in which 

 there are many flat whorls, very deeply entering lamellae, 

 and two weak palatals. This is a specially Azorean modifica- 

 tion of tbe Leiostyla stock, unlike anything known elsewhere. 



2. Group of L. fuscidula (Section Leiosiyla). These are 

 unspecialized Leiostyla' related to the taeniata group of the 

 Canaries and the vineta group of Madeira. In the Azores 

 species, as in the Canarian, there is no upper-palatal fold. 

 In the somewhat aberrant L. vermiculosa the parietal lamella 

 is disappearing. 



3. Group of L. fasciolata (Section Petrarca). With the 

 color and sculpture of L. fuscidvla, there has been reduction 

 of teeth — only the angular lamella and a vestigeal columellar 

 remaining. \ 



