TAYLOR: MOI.LUSCA ,OK AUDRUICQ, PAS-DE-CALAIS. Ill 



var. txlbocincta Taylor is exemplified by several clearly banded shells ; 

 they are all of the widely umbilicate and depressed form. All the 

 specimens show that they have inhabited an exposed or open area, 

 being destitute of the periostracal hairs which are an almost invariable 

 feature of individuals frequenting a moist, umbrageous environment. 

 Bouchard-Chantereaux catalogues this species. 



Theba cantiania (Mont.). — Common, but local. The specimens 

 were collected in September by the lagoon, Calais ; all are of a deep 

 reddish colour basally and round the aperture, showing distmctly 

 thereon the white peripheral zone characteristic of the palceogenic var. 

 alhocinda Ckll. Bouchard-Chantereaux notices this as common in 

 places, under the name of Helix carthusiana Draparnaud. He 

 describes the shell as usually of a whitish colour and mentions a 

 variety which is reddish about the mouth, but does not allude to the 

 peripheral zonulation. 



Xerophila virgata (Da Costa) is represented by a few immature 

 shells, found by the lagoon, Calais, in August ; they do not exhibit 

 any marked deviation from the ordinary form. Bouchard-Chantereaux 

 cites this species as very common on the downs and enumerates eight 

 varieties, and catalogues Helix po/natia, H arbustorum. H. Carthusian- . 

 ella, H. olivieri, H. revelata \^ = H. fusca Montagu], H. pulchella^ H 

 ericetoriim, H. intersecta and H. striata, the two last named are 

 apparently equivalent to our Xerophila caperata and X. heripensis, 

 while Bulimus acutus is mentioned as found dead in the alluvium of 

 Wimereux, near Boulogne. 



Hna obscura (Drap). — Found at Polincove in May. Bouchard- 

 Chantereaux alludes to this as rather common. 



Pupa cylindracea (Da Costa). — Common, but local, and the sole 

 representative of the Pupillidce in the collection ; the specimens are 

 from the vicinity of the lagoon, Calais, where it is locally common. 

 They are mostly the small slender form named var. gracilis by Issel ; 

 the exceptionally massive lip of some of the mature shells is worthy 

 of note and such examples would be suitably named var. crassilabris. 

 Bouchard-Chantereaux mentions the species as very common. He 

 also enumerates Pupa marginata, Pupa secale, Pupa fruinentum, 

 P. tridentalis and Vertigo antivertigo. 



Balea perversa (L.). — Found near Audruicq in June, and re- 

 markable for rich black-brown colouring simulating the aspect of the 

 Clausilice in the same box. All are referable to the var. simplex Moq., 

 having a quadrate aperture which is quite destitute of the parietal 

 denticle. Bouchard-Chantereaux says it is very common. 



Clausilia bidentata (Strom) represents the genus in the collec- 

 tion, the specimens were all gathered at Audruicq in June, in company 



