Plate IV. 



Fig. I. Astartr boreal is Chemnitz. 



a. A siiecinien without folds and with an almost smooth periostracum. x i. West Iceland, 22 fm. 



b. The same from above. 



c. A very high form, with quite narrow folds on the uppermost part of the shell and with 

 fairly thick, fibrous periostracum on the lowest part, x i. West Iceland (Faxafjordr), 

 8— 11V2 fm. 



d & e. A strongly compressed form with distinct folds on the uppermost part of the shell. 

 X I. West Greenland. 



f. A very elongated form from East Greenland (Hekla Havn). x I'/a- 



— 2. Astartc Mo7itagui T)\\\\^ yYL. 



a. Forma fypica, a short and high, somewhat triangular form, x 172- West Iceland (Faxa- 

 fjordr), 15 — 16 fm. 



b. Van striata (Leach) ,Sars, a more elongated form, x i'/,. West Greenland (Jakobshavn). 



c. Var. Warliaiiii Hancock, an elongated, elliptical form, x i. East Greenland (Hurr\- Inlet), 

 10 fm. 



— 3. Astarte sulcata da Costa. 



a & b. A typical specimen from the Faeroes, 150 fm. x i. 



c. A specimen with comiDaratively close-placed ribs, from Denmark Strait off south-eastern 

 Greenland (Ingolf St. 94), 204 fm. x i. 



— 4. Astarte clliptica Brown. 



a & b. A typical specimen from the Fceroes (Klaksvig), 10 — 15 fm. x i. 

 c & d. A very elongated form, from East Greenland (Hekla Havn). x i. 

 e & f. A very high and convex form, from West Greenland, x i. 



g. A specimen in which the folds disappear almost about the middle of the shell, x i. West 

 Greenland (Vaigat). 



— 5. Astarte creiiata Gray. 



a & b. A typical specimen from East Greenland (Hurr>' Inlet), 50 fm. x i. 

 c. A specimen with fewer and more prominent ribs, x i. East Greenland (Cape Hope), 121 fm. 

 d & e. A specimen of var. siibwquilatera Sowerby. xi. Davis Strait (Ingolf St. 32), 318 fm. 

 f & g. A specimen of var. crebricostata Mc. Andr. & Forbes, x i. North Iceland (Skage- 



strands Bugt), 119 fm. 

 h & i. A specimen of var. ii/ftafa Hagg. x i'/^. East Greenland (Forsblads Fjord), 90 — 50 fm. 

 k & 1. A specimen of var. aciiticostata Jeffreys, x I'/'a- S. of Jan Mayen (Ingolf >St. 116), 



371 fm. 

 m. A part of the shell, more magnified. 



