LAUKIA, AZORES ISLANDS. 123 



A species resmbling L. fanalensis in size and shape, but 

 differing by the much more distinct, tine sharp striatum, and 

 by the development of a weak columellar lamella which 

 emerges nearly to the edge of the columellar lip in some ex- 

 amples, in others only so far as to be barely visible. In 

 color, too, it is usually unlike fanalensis, yet some specimen* 

 are nearly as pale as that species. 



The alleged distribution '* dans toutes les iles de lArch- 

 ipel " given by Morelet has been mentioned by Wollaston in 

 an ironic note. It will probably be found in different racial 

 forms on the several islands inhabited. 



The typical form as figured by Morelet, PL 7, fig. 16, is 

 transparent grayish ("corneous") with a cinnamon band 

 just above the periphery and a patch at the umbilicus. 

 Columellar lamella distinct. 



Length 2.7, diam. 1.5 mm., 5 whorls. 



Length 2.5, diam. 1.4 mm. 



A single specimen from S. Miguel, pi. 7, fig. 17, is corneous, 

 very faintly brownish above the periphery. One of this color 

 was sent us by Morelet with others of the typical color pat- 

 tern, the island not specified. 



In all adults the angular lamella is a mere thread within, 

 rising triangularly in front, in a short compressed lamella 

 well removed from the termination of the lip. 



Immature specimens probably a half whorl short of full 

 size show the usual two lamella?, rather small, and two ex- 

 tremely weak radial palatal teeth, placed as in L. cylindracea. 

 They may perhaps be found stronger in younger shells. 



Form hortana, n. f., collected at Horta, Fayal, PL 7, figs. 

 18, 19, is chestnut-brown above the periphery, pale olive but? 

 below, sometimes brownish again at the umbilicus. Colu- 

 mellar lamella very weak, less emerging. 



Length 2.6, diam. 1.4 mm., .">' , whorls. Type of /. hortana. 



Length 2.25, diam. 1.4 mm., 5 whorls. 



The color pattern is that of L. angUca. 



