CHASTER AND HEATHCOTE : MOLLUSCA OF OBAN. 295 



young in all stages of growth was obtained. These 

 younger ones are delicate and beautiful objects, puzzling 

 to anyone acquainted only with the adult. 



Aporrhais pes-pelicani, L. One living and two or three 



dead specimens dredged between Kerrera and Lismore in 



mud. 

 ** Triforis perversa, L. {Cerithmm perversuui). One 



dredged alive. 

 Bittium reticulatum, Da Costa. {CeritJiium reiiadatiim). 



[R.D.D. MS.]. A few fresh examples dredged. 



* Cerithiopsis -tubercularis, Mont. [A.M.N.]. 



Trichotropis boreal is, Brod. and Sow. This species is 

 quite common on hard ground everywhere near Oban, 

 especially in Kerrera Sound. Unfortunately the majority 

 of specimens lose much of their beauty on drying, owing 

 to the shrinking of the epidermal spiny processes. A {^^fi 

 of the specimens have the interior of a pure white instead 

 of the usual brown colour. 



Turritella terebra, L. Dredged alive with the var. nivea, 

 Jeff, in mud between Kerrera and Lismore. Brown states 

 that in the Clyde district the variety selects a rather cleaner 

 bottom than the type. 



** Caecum glabrum, Mont. Two specimens were found in 

 the dredgings. 



Littorina littorea, L. Abundant everywhere in the lower 

 littoral zone, living amongst FiicL 



L. rudis, Maton. [Type and var. tenebrosa, A.M.N. ; vars. 

 sulcata and tenebrosa, R.D.D. MS.]. Very abundant on 

 rocks just below the high water mark of ordinary tides. 



L. obtusata, L. This species swarms on the Fucl'in the littoral 

 zone. The colouring is very varied — ^yellow, olive, green, 

 and purple-black. Many specimens are banded with black, 

 or tessellated in shades of reddish brown, having a beautiful 



