LAMELLIBRANCHIATA. 



The maximum length is 23 """. 



The measurements of some specimens will illustrate the form-relation among the varieties 

 mentioned. 



A. Montagui typica: 



Length Height 



18.5 """. 



15 



14 



*3 



12 



I I - 64.7 



9-5 - 6 5-5 



8.2 



7.2 - 62.6 



8 - 69.6 



7.25- 



. I. Montagui var. striata : 



23 - 19.75 ■ 85.9 - 12 52.2 



19.8 - 16.75 " 8 4- 6 _ 



19 - 16.5 - 86.8 - 9.5 ■ 5° 



18.5 - 16 86.5 - 9.25- 50 



17 - 14-75 - 86.8 8.5 ■ 50 



15 - 13 86.7 - 8 - 53.3 



A. Montagui var. Warhami. 



19 - 15 78.9 - 9.25- 4 s -4 



17.75- H 7 8 -9 - 9 - 5°-7 



14.5 - 11.25 - 77- 6 - 7 4 8 -3 



12.75- 9-75 - 7 6 -5 6 -5 ■ 5 1 



East Greenland. 



Here A. Montagui has been taken at 15 localities between Angmagssalik and Sabine Island 

 (65°4o'— 74°32' N. L.), at depths of 3— 501m. The largest specimen is 24.2 " long. 



The majority of the specimens at hand belong to the variety Warhami, in a form which is 

 generally rather compressed but is sometimes rather tumid; the variation in this regard will b< 

 from the accompanying measurements. 



