TAYLOR : MOLI.USCA OF AUDRUICQ, I'AS-DE-CALAIS. IO7 



It may l)e well to remark that every slug in its emi)ryonal stage 

 possesses a spirally coiled shell, the Arions l)eing no exception to this 

 rule. In some genera the embryonal shell is even said to be furnished 

 with an operculum. 



Bouchard-Chantereaux describes L. maximus as common in tlie 

 department and cites four varieties, he also catalogues L. agresiis, 

 L. brunneus, L. arborum and L. variegatus. 



Vitrina pellucida (Miill.).— Is only represented by a few small 

 and mostly dead shells from Henuin, though Mr. Cribb describes the 

 species rfs very common and well distributed. 



Bouchard-Chantereaux says " common throughout the department." 



Hyalinia cellaria (Miill.). — Specimens collected at Audruicq in 

 June and at Ostove in November are remarkable for their unusually 

 brilliant polish, quite reminiscent of helvetica. Bouchard-Chantereaux 

 enumerates this as Helix iiitida Drap., and probably includes under 

 this name Hyalinia lucida also. 



Hyalinia nitidula (Drap.). — The examples found at Polincove 

 and Ostove in November are richly coloured and large, so large 

 indeed as almost to entitle them to be var. major. Bouchard- 

 Chantereaux does not include this species, but may possibly have 

 confused it w^ith his Helix nitida or Helix hicida. 



Hyalinia pura (Alder). — Collected at Polincove in November ; 

 apparently referable to var. lenticida Held. This is at present only 

 known in England from Watlington, Oxon., and the species was 

 unknown to Bouchard-Chantereaux. 



Hyalinia crystallina (Miill.). — Two found at Polincove in 

 October. One specimen is referable to the var. contractu Clessin. 

 Catalogued by Bouchard-Chantereaux. 



Zonitoides nitidus (Miill.). — -Found during November at Polin- 

 cove ; brilliantly lustrous, especially in the immature stage. Bouchard- 

 Chantereaux catalogues this as Helix lucida Drap. 



Pyramidula rotundata (Miill). — Widely distributed and very 

 common. The shells collected at Polincove in November are remark- 

 able for their subuniform dusky pigmentation, var, obsciirata Dumont 

 and Mortillet, while those from Audruicq are pale rufous fawn, 

 beautifully and distinctly maculate with rich rufous, var. vulgaris 

 Dumont and Mortillet. Pas-de-Calais (Bouchard-Chantereaux). 



Helix aspersa L. — Widely distributed and very common. Two 

 specimens are from the banks of the lagoon, Calais, one a pretty 

 specimen o{ \2iX. fasciata Picard showing the formula 12345, the other 

 more typical with a band formula (f?3)45, but also showing a strong 

 tendency to var. albofasciata Jeffreys. The shells from' Polincove 

 collected in July include a fine shell shovying the transverse markings 



