Crustacea. 5615 



Aclis unica. From a sponge, Hayle Sands. 



Odostomia plicata. Beneath stones amongst Serpula, Penzance. 



„ rissoides. Beneath stones amongst Serpula, Penzance. 



„ cylindrica. Mousehole, near Penzance, amongst the 



smaller Alga?. 



Lachesis minima. Sea-weeds, Penzance ; not common. 

 Nassa incrassata. Rock pools, among Algae, Penzance. 

 Mangelia linearis. Beneath stones, between tide-marks, Penzance. 



„ costata. Rock-pools, Penzance. 



Cylichna truncata. Sea-weeds, Penzance, and much finer at the 

 Land's End. 



„ obtusa. Sea-weeds, Penzance. 



Amphisphyra hyalina. Sea-weeds, Penzance. 



Philine scabra. Mount's Bay, about a mile from shore, in mud- 

 sand, by dredge. 



Aplysia hybrida. Penzance, Mousehole and the Land's End. 



PULMONIFEROUS MOLLUSCA. 



Helix arbustorum. Penzance, Millett. 



„ pisana. St. Ives, feeding on the Eryngium maritimum, 

 Millett. 



„ revelata. Land's End, Millett. 

 Bulimus acutus. On the sand-hills, Bude Haven. 

 Balea fragilis. On walls, St. Michael's Mount. 

 Planorbis vortex. Abundant, about Lennen, near the Laud's 

 End. 



Lymnaeus glaber. Very abundant in ponds about Lennen Church, 

 near the Land's End. 



Conovulus denticulatus. Near Penzance, Millett. 



William F. Templer. 

 Charmouth, Dorset, April 5, 1857. 



Notes on the Habits of the Nipper Crab (Polybius Henslowii). — The nipper crab is 

 in captivity by far the most amusing of British Crustaceans ; and as, when kept a little 

 moisteued, it will long survive its capture, it is in the power of an observer to study its 

 habits with greater certainty than we can those of the larger portion of its fellows: 

 with a little attention it is probable it might even be sent a long distance without 

 injury ; and, confined in a tank, it does not require such frequent renewals of water as 

 other species. The following notes, which are written from frequent observation, are 

 intended to form a supplement to the more extended remarks on the habits of this 

 crab (Zool. 5531). The nipper crab is most frequently caught iu the summer and 



