8o JOURNAL OF CONCHOLOGY, VOL. 10, NO. 3, JULY, I9OI. 



Cochlodesma praetenue (Pult.) (Thracia). — Dredged alive, 

 Port Erin (Darbishire). 



T. fragilis Penn. (papyracea Poli). — A small example dredged 

 off Bradda Head. 



T. distorta (Mont.). — One dredged. 



Pulsellum lofotense Sars (Siphonodentalium). — Dr. Chaster 

 records i^J. Conch., vol. 8, p. ii) the occurrence of six living examples 

 in mud, trawled about five miles north-west of Peel (60 fathoms). 



Dentalium entalis I^. — Extremely fine living specimens dredged 

 off Port Erin and Spanish Head (20 fathoms). 



D. vulgare da ("osta (tarentinum). — Dead only. 



Patella vulgata E. — Very fine around Spanish Head and at the 

 Sound. Many are egg-shaped in outline. 



v. elevata Jeffr. — Plentiful at Port St. Mary, on the rocks on 

 each side of the esplanade. 



v. picta Jeffr. — Abundant at Port Erin. 



V. caerulea L. — Very scarce. Beautiful specimens under rocks 

 at the Sound. 



Dr. Jeffreys (B.C., vol. 3, p. 240) quotes Canon Norman's remarks 

 {Zoologist, Oct., i860) : — " It will be found to be a general rule with 

 regard to the limpet, that the nearer high-water mark the shell is taken, 

 the higher spired, more strongly ribbed, and smaller it will be ; and 

 that the lower down it lives the flatter, less ribbed, and larger it be- 

 comes." Our experience is quite contrary to this statement, for our 

 finest examples have all been taken near high-water at the Sound and 

 around Spanish Head. It would be interesting if members of the 

 Society would communicate their experience in notes to the Journal. 

 This species in its many forms presents a most interesting field of 

 molluscan research. 



Patella athletica Bean. — Abundant at Fle.shwick. Scarce at 

 Port Erin and the Sound. Very fine at Port St. Mary. Forbes and 

 Hanley (Brit. Moll., vol. 2, p. 426) go fully into the question of the 

 specific rank of this form. Clarke also considered it a species ; also 

 many continental authors. The chief reasons for this seem to us to 

 be— (rt), the remarkable difference from P. vulgata in the colour of 

 the animal ; (/'), it is always found in rock-pools left filled with water 

 by the receding tide : (<r), it is always covered with a long tuft of 

 weeds, which frequently almost hides the shell. Jeffreys says of this 

 (B.C., vol. 3, p. 237) "frequents rocks only at low water." We have 

 never found it at low water, but in rock-pools above half-tide. 



Patina pellucida E. (Helcion). 



V. Isevis Penn. — Large examples plentiful. We are strongly in- 

 clined to raise this variety to specific rank as it differs so markedly in 

 habitat and texture from F, pellucida. 



