GUDE : NEW AND UNFIGURED SPECIES OF PLECTOPVLIS. 



115 



short. One third of a whorl behind this set of barriers, occurs the 

 remains of an earher set ; the parietal barriers have been completely 

 absorbed, but the palatal folds are still left, although the upper ones 

 are already in course of disintegration. At this stage the bristles do 

 not appear to have been produced, several specimens, although quite 

 fresh, being void of these cuticular processes. A shell with only three 

 whorls has also two sets of armatures ; of the earlier the parietal folds 

 are still intact, while of the palatal folds the first and second have 

 almost disappeared, and the remaining ones are very slight. 



The shell figured is in my collection. 



Figs. 3a — 3c show the shell in three different positions, fig. 3d the 

 exterior of the wall behind the peristome magnified, fig. 30 illustrates 

 the parietal, and fig. 3f the palatal armature in situ. 



Mr. Mabille has obligingly compared my shell with the type in 

 the Museum d'Histoire Naturelle in Paris, and he informs me that it 

 is the true P. phlijaria. 



Pleetopylis (Endoplon) moellendorffl, n. sp. Figs. 4a— 4r. 



Shell dextral, discoid, deeply umbilicated, whitish corneous, rather 

 thin, the earlier whorls finely ribbed, the later ones finely striated, the 

 cuticle produced into raised lamellae and decussated with close set, 



Figs. 4a— 4f. — rkdopylls {Endoplon) moellendorjffi, n. sp. 



raised, spiral ridges provided with short bristles. Spire depressed, 

 apex raised, suture linear. "Whorls 7-^, a little flattened above, rounded 

 at the side and below, increasing slowly and regularly ; the last twice 

 as wide as the penultimate, a little dilated towards the mouth and 

 slightly constricted behind the peristome, a little descending in front. 



