SUPPLEMENT TO DAWSON'S " MOLLUSCA OF ABERDEEN " 103 



TROCHUS ZIZYPHINUS, Z., var. ELATA, Jeff. This variety has been 

 brought into Aberdeen by trawl-boats on several occasions, but 

 in no case have I been unable to obtain precise information as 

 to where they had been fishing. 



RISSOA PARVA (Da C.), var. INTERRUPTA, Ad. Common amongst 

 littoral seaweeds. 



RISSOA VIOLACEA, Deom. Several dead specimens found on the 

 beach at Peterhead. 



RISSOA STRIATA (Ad.}, var. ARCTICA, Lov. Alive on the roots of 

 Laminaria and other littoral seaweeds. 



TURRITELLA TEREBRA (Z.), var. NIVEA, Jeff., and var. GRACILIS, 

 Jeff. Dead specimens common on trawl-boats when fishing in 

 deep water. 



ODOSTOMIA INTERSTINCTA (Mont.\ var. TEREBELLUM (Phil.'). 

 Mr. Marshall found several dead in dredged sand sent to him 

 by me in 1893. 



STILIFER TURTONI, Brod. Six specimens of this rare shell were 

 obtained by me in 1892 during a trip with a steam trawler. 

 They were brought up in the trawl, attached to the spines of 

 Echinus esculentus. At the time, we were trawling 80 miles off 

 Aberdeen in 40 fathoms. Since then, numbers from various 

 districts have been found on our local trawl-boats. 



NATICA GRCENLANDICA (Gm.\ Very common between the "Long 

 Forties," and the " Great Fisher Bank." Generally dead, but 

 quite fresh. 



In reference to our Northern form of N. grcenlandica, 

 Mr. Marshall says : " They have the shape and spire of N. 

 montacuti. The Dogger Bank specimens usually have a more 

 globular shell, with a small depressed spire." 



NATICA ALDERI, Forb., var. LACTEA, Jeff., and var. SUBOVALIS, Jeff. 

 Both varieties are often obtained from deep water off Aberdeen. 



PURPURA LAPILLUS (Z.), var. MINOR, Jeff. On stones at the north 

 breakwater at Aberdeen. 



BUCCINUM UNDATUM, Z., var. STRIATA, Penn. On forwarding 

 Mr. Marshall a specimen of what I took to be this var., he 

 replied that although it was not a well-marked example, he 

 would still regard it as referable to this form. Var. PELAGICA, 

 King. A large number of this fine variety have been brought 

 into Aberdeen by trawl-boats. The largest I have seen 

 measured 6| inches. Both varieties are found together, 

 between the " Long Forties " and " Fisher Bank." 



