328 



very distinct species : M. corrugata may easily be distinguished 

 from M. laevigata var. substriata (M. laevis Beck) by the cha- 

 racter that the periostracum of the median area is not smooth, 

 but shows a fine wrinkling when placed under a lens, almost 

 as M. nigra] from the latter species M. corrugata differs again 

 by the feature that the median area is distinctly set off against 

 the posterior area as in M. laevigata. 



Fossil. A fragment of a middle-sized valve was found at 

 Hurry-Inlet opposite the anchoring place (Dan. East-Greenland 

 Exped. 1900). 



Modiolaria nigra Gray. 



1901^ — 02. Tasiusak 10 — 15 fms. 1 specimen. 



1900. Cape Dalton 9 — 11 — Clay 25 — 



1900. Turner-Sound ca. 3 — 30— (IS— 445 mm.). 



1900. HuiTv-lnlet 7—0 — Clay and sand 5— (3 empty). 



1900. Cape Bovlase Warren Laminarians 1 — (empty). 



The largest specimen, the one from the last mentioned 

 locality, is of a length of 4o'5 mm. 



The Kolthoff-Expedition of 1900 took 15 specimens, up 

 to a length of 40 mm., in Mackenzie-Bay N. of Franz Joseph- 

 Fjord, where the depth was 6V2 — 19 fms. (Hägg 1. с. p. 26). 



Modiolaria nigra is thus found from the most southern 

 region up to Cape Borlase Warren which is situated at 74°20'N. 



The shape is very variable in the East-Greenland speci- 

 mens, sometimes low and ventricous, sometimes comparatively 

 high and compressed, which will be seen from the measures 

 stated below: 



Length. Height. Breadth. 



a. Turner-Sound ... 44-5 mm. 21*5 mm. 16 mm. 



b. Cape Dalton 40 — 22 — 14 — 



c. — — 35-5 — 19-6 — 14-6 — 



d. — — 35-5 ~ 20 — 12-6 — 



e. — — 34-5 — 18.5 — 12-25 — 



f. Turner-Sound ... 31 — 17 — 10-5 — 



