20 



Mont. — Serpula cornea, Adams. — Delphi- 

 noidea depressa, Brown, 



Animal white, translucent ; head proboscidiform, 

 but not furnished with a trunk ; tentacula long, cy- 

 lindric, transparent, with the eyes at their bases exter- 

 nally ; eyes large ; foot short ; no cirrhi. It does 

 not erect its shell when in motion, but drags it side- 

 ways. The tentacula, during progression, are in 

 general turned back, or directed laterally. 



Under stones at low water. Common. 



2. divisa. 



Skenea divisa, Flem. — Turbo divisus, Adams. 

 Very rare. From deep water off Douglas Head. 



3. serpuloides. 



Skenea serpuloides, Flem, — Helix serpuloides, 

 Mont. — Delphnoidea serpuloides. Brown. 

 — Valvata minuta, Turt. 

 Douglas. Not rare. 



XXXIV. Valvata, Mull 

 1. piscinalis. 



Valvata piscinalis. Lam. — V. obtusa, Pfiiff. 

 — Nerita piscinalis. Mull. — Turbo fonti- 

 nalis, Mont. — Cyclostoma obtusum, Drap. 

 — Helix piscinalis, Gmel. — Lymnaea fonti- 

 nalis, Flem. (Ed. Enc.) 

 Testa junior. Valvata depressa, Pfeiff. 

 The animal is described by Nilson. 

 Ditches in the Curraghs. Common. 



