347 



The Nathorst-Expedition of 1899 took it at the following 

 localities, specimens of a length up to 21*5 mm.4: 



Scoresby-Sound, Fame-Isles 2V2— 4 fms. Mud 3 specim. 



— — .... ca. 5 — Mud 1 — 



— — ....12-13 — Clay 4 ~ 



— Cape Stewart 7— 9V2 — Mud and stones 2 — 



Franz Joseph-Fjord ca. IV2— 5 — Sandy mud 12 — 



— — 15 — 19 — Clay with stones & gravel 



2 specim. 

 S. of Little Pendulum-Island 9'/2— 11 — Mud and sand 1 — 



At last the Ко 1th off-Expedition of 190Ü took it at the 

 following localities, specimens of a length of up to 28mm.^): 



Mackenzie-Bay, N. of Franz Joseph-Fjord . . 6V2 — 10 fms. Mud 1 specimen. 



— — — — .. 6'/2— 19 — Mud 33 — 



Tellina moesta is thus found to occur generally along 

 East-Greenland from Cape Dalton (69° 24 V2' IN.) till south of 

 Little Pendulum-Island (74° 35' N.). 



Its further distribution is as follows : West-Greenland, 

 Baffin-Land, Alaska, the Tschuktscher-Peninsula, the Siberian 

 Arctic-Sea, the Kara-Sea, Nowaya-Zemiia and Spitzbergen. Its 

 vertical distribution is 3 — 150 fms. (comp. Jensen 1. c, with 

 the there given detailed record of the synonymy of the species). 



From Tellina (Macoma) calcaria Chemn. which T. (M.) 

 moesta Desh. most resembles in size (it obtains a length of 

 34*5 mm.) it may be distinguished by the extent of the palliai 

 sinus: in T. moesta the palliai sinus is short, not only on the 

 right valve but also on the left, and on both valves the sinus 

 stops at about the same distance from the impression of the 

 anterior adductor (flg. 4 è, с); in T. calcaria the palliai sinus 

 is, on the contrary, comparatively long on the left valve and 

 approaches near to the impression of the anterior adductor, 



^) Belong to the «Riks-Museum» in Stockholm -where 1 have examined them. 



^) Comp. R. Hägg 1. с. who on p. 47 names the species Tellina calcaria 

 Chemn. var. subovalis Posselt; but in a postscript p. 66 he has come 

 to the conclusion that this «variety of calcaria^' correctly must be 

 reijarded as Tellina moesta Deshaves. 



