302 CHASTER AND HEATHCOTE : MOLLUSCA OF OBAN. 



Calliostoma zizyphinus, L. (Trochus zizyphinus). Not 

 uncommon on Fuci along the shore. From a rowing boat 

 they could be seen crawluig over the weeds at a consider- 

 able depth, when the water was calm and the sun shining 

 brightly. A specimen of the var. lyonsii, Flem. was 

 dredged off Maiden Island. The var. hu/nilior, Jeff, was 

 taken on the shore. 



C. montagui, Wood. {Trochus moutacuti). Dredged alive in 

 shallow water off Lismore and Maiden Islands. 



C. millegranum, Phil. Very common in all the dredgings on 

 hard ground. Most of the specimens are pure white, and 

 when clean some of them are beautifully iridescent. One 

 or two with a much narrower base may perhaps be referred 

 to the var. pyra/nidata, Jeff. * 



Gibbula magus, L. {Trochus magus), [var. a3a, Jeffreys]. 

 On Lamijiaria in the strait between Fraoich and Kerrera 

 Islands, and off Maiden Island. The only adult specimen 

 obtained alive is almost entirely white, presenting merely 

 traces of colour here and there along the spiral striae on the 

 body whorl. 



G. umbilicata, Mont. A few found on Bala?ius-covtx&6. 

 rocks and stones along the shore. In some the spire is 

 very much depressed. 



G. cineraria, L. Very common among Fuci. 



G. tumida, Mont. Common on hard ground. 



Margarita helicina, Fabr. {Trochus helicimis). Immature 

 specimens dredged dead. 



M. grcEnlandica, Chem. [A.M.N.]. Several examples 

 dredged alive in shallow water off I.ismore and in Kerrera 

 Sound. The var. albida, Jeff, occurred with the type. A 

 single specimen has been taken in the Clyde district 

 (Brown); Loch Leven Ferry (Knight). 



Fissurella grasca, L.. Dredged in Kerrera Sound and taken 

 under stones on the shore. 



J.C, \\\., Jan. 1894. 



