odhner: marine mollusca of iceland. 21 



Telliiia calcarea Chemnitz. 

 Berufjord, 15—40 fms, many sps., max. I. 35; D:o, 7— 

 13 fms, many sps., max. 1. 12,5 — Hofsos, 40 fms, clay, ca 

 25 sps., max. 1. 27,5 — Raufarhofn, 35 fms, 7 sps. (f), max. 

 1. 29,.ö — Reykiavik, 2 fms, stones, 15 sps. (f), max. 1. 23 — 

 Siglafjord, 12 fms, 9 sps., max. 1. 6 — Thistilfjord, 10—16 fms, 

 sand, clay, many sps., max. 1. 12 — Öfjord, 50 fms, clay, 4 

 sps., max. 1. 14,3. 



Lyonsia areiiosa (Möller). ^ 

 Berufjord, 25 fms, clay, 4 sps. (f), max. 1. 14 (with a fresh 

 appearance). — New to Iceland. 



Tliracia triiiicata Brown. 



Fig. 14—15. 



Berufjord, 7—13 fms, 6 sps. (f), max. 1. 24,4 — D:o, 3 

 fms, ebb, Laminarise, 3 sps., max. 1. ca 4 — D:o 15 — 30 fms, 

 many sps., max. 1. 34,5 (f, bored), max. 1. living 7 — Hofsos, 

 40 fms, clay, 1 sp. (t), 1. 15 — Reykiavik, 8 fms, stones, 1 sp., 

 1. 8,5 — Thistilfjord, 10—16 fms, sand, clay, 6 small sps., max. 

 1. 2,7. — Jeffreys mentiones also Th. proetenuis from Iceland, 

 which is however not represented in tbe collections. 



Tliracia septentrionalis Jeffreys. 



= Th. truncata jMighels & Adams (not Brown). Fig. 12 — 13. 

 Ranfarliofn, 25 — 35 fms, many sps., max. 1. 27,5 — Dif- 

 fering from Th. truncata in the shells being very solid, re- 

 sembling Mactra, with a smooth surface and a yellowish, 

 shining cuticula. Sculpture consisting only of regular lines 

 of growth and some very fine radiating striae in the anterior 

 part. Umbones situated rather far behind the middle of the 

 shell; the anterior part consequently much prolonged, the pos- 

 terior one abruptly truncated. Pallial sinus lengthened, pro- 

 truding straight forward; its lower part being most prolonged 

 (in Th. truncata the sinus is symmetrically rounded and pro- 

 jecting obliquely upward). Fine träns verse strise surround- 

 ing the pallial line. Measurements (maximal) in mm: Length 



^ Jeffreys mentiones L- norvegica from Iceland, but the specimens 

 considered by him belong to the above species. 



