329 

 Crenella decussata Montagu. 



1901—02. Tiningnekelak 1 specimen. 



By this specimen, which is 4-75 mm. high, the species has 

 for the first time been represented at East-Greenland. 



Limidae. 



Limatula hyperborea n. sp. 



Shell oval or elliptical, extremely convex, white or 

 yellowish white with a faint lustre. The valve is thin, a little 

 oblique, the anterior margin forming a faint regular arch, the 



h 



d 



Fig. 1. Limatula hyi)erborea n. sp. 



A specimen from East-Greenland (Forsblad-Fjord, 90- .50fms.), seen 



from the right side [a] and from the left [b], from before (c) and 



from above [d]. X ^/2. 



posterior margin being somewhat more arched above. Sculp- 

 ture, 24 — 36 fine, but distinct and sharp radial ridges which 

 disappear towards the sides; two of the middlemost are generally 

 stronger and with larger interval than the others, and thus they 

 form a rather marked furrow which is situated almost medially 

 or a little to the side of a line through the middle of the valve 

 (sometimes only one conspicuous median rib appears); the 

 concentrical striation exceedingly fine. Beaks prominent; hinge- 

 line comparatively long, almost straight, forming an obtuse angle 

 with the side-margins; the ligament-pit triangular; the inside 



