ODHNER, MARINE MOLLUSCA OF ICELAND 15 



All these specimens form a connecting series between 

 the Scandinavian D. hyalina and D. glacialis Odhner 1907 

 of Spitzbergen, which I therefore consider to be only an ex- 

 treme variety of D. hyalina and not a separate species. On 

 the Iceland specimens the outher lip extends to the height 

 of or över the plane of the spire; in the Scandinavian and 

 Greenland form these lie on the same plane; in the variety 

 glacialis of Spitzbergen the outher lip extends far beyond the 

 apex. (Cfr Odhner 1907.) 



Retiisa pertenuis (Mighels). ^ 



Berufjord, 25—40 fms, clay, ca 40 sps., max. height 3,2 

 (Odhner 1907) — Hofsos, 40 fms, clay, 3 sps., max. h. 2,3 — 

 Raufarhofn, 35 fms, 12 sps. (a fevv born), max. h. 3,2 — Thistil- 

 fjord, 10 — 16 fms, sand, clay, 3 sps., max. h. 3,4 — Sigla- 

 fjord, 8—12 fms, 4 sps., max. h. 3,4. 



Cyliclma alba (Brown) 

 [incl. var. corticata (Möller)]. 



Berufjord, 15 — 30 fms, ca 50 sps., max. height 8,3 (Odh- 

 ner 1907) — Hofsos, 3 sps., max. h. 7,7 — Raufarhofn, 35 

 fms, 1 sp., h. 5,4 — Siglafjord, 8 — 12 fms, 2 sps., max. h. 11,5 

 — Thistilfjord, 10 — 16 fms, 4 sps., max. h. 5,7. 



Cyliclma Keiiihardti (Möller). 

 Hofsos, 40 fms, clay, 1 sp., height 3 mm (Odhner 1907). 



Cyliclma scalpta (Reeve). 



Berufjord, 40 fms, clay, 17 sps., max. height 7,4 mm. — 

 New to Iceland. 



Philiiie liiiia (Brown). 



Berufjord, 15—40 fms, clay, ca 30 shells, max. height 

 (length) 4,8 mm (Odhner 1907). 



^ Jeffreys inentiones B. ohtusa, citing Torell, but all the specimens 

 in the collections belong to the above species. 



