304 CHASTER AND HEATHCOTE : MOLLUSCA OF OBAN. 



Patella vulgata, L. Abundant everywhere in the Laminarian 

 zone. The var. picta, Jeff, occurs with the type. 



Acanthochites fascicularis, T.. {Chiton fasciadaris). [van 

 attenuata, Jeffreys ; A.M.N. ; fine in Lam. roots and under 

 stones at Kerrera ferry, F. Archer; R.D.D. MS.]. A few 

 dredged and taken under stones on the shore. 



Hanleyia debilis, Gray. {Chiton hanhyi). [Jeffreys; A.M.N.]. 

 One came up from 30 fathoms in the Sound of Mull, 

 nestling inside a valve of Astarte sulcata. 



Trachydermon marginatus, Penn. {Chiton marginatns). 

 Several taken on the shore, all of them comparatively small. 



Leptochiton c\r\ere\AS,^^. {Chiton cinereus). Dredged of the 

 usual size; specimens measuring 19 mm. taken under 

 stones at low water. 



L. ruber, L. A few dredged in Kerrera Sound and off 

 Lismore. 



Tonicella marmorea, Fabr. {Chiton mamioreus). One fine 

 specimen taken on the shore. Another, which was dredged, 

 has the shell remarkably raised along the middle so as to 

 present a prominent keel ; when viewed from the end, 

 the angle is seen to equal approximately a right angle. 



Callochiton laevis, Penn. [Jeffreys; A.M.N.]. Fine speci- 

 mens, measuring 24 mm., were taken on stones at low 

 water near Kerrera ferry and on Fraoich Island. 



Dentalium entails, L. Common in mud between Maiden 

 and Lismore Islands. 



** Pulsellum lofotense, Sars. {Siphonodentalium iofotense). 

 A few small specimens in the dredgings from off Lismore. 

 Mr. Robertson has taken it in the Clyde district, 



Anomia ephippium, L. Dredged on stones and shells. 

 Fairly common but generally small. Large specimens, 

 measuring as much as 54 mm., taken under loose stones 

 on the shore, where also the var. aculeata, Gmel. occurs 

 sparingly. 



J.C, vii., Jan. 1804. 



