1898-1902. No. 20.1 BRACHIOPODS AND MOLLUSCS. 



9 



Aug. 550. 1901. Gaasefjord, 8 m. Small stones and clay with fucaceae. 



July 11. 1902. St. Helena. 4 14 in. Large and small stones over grown with 



fucaceae. 



July 15. Off Havhestfjeld, North Devon. 

 July 19. Off the camping ground. North Devon, 6 14 m. Small stones and 



algae. 



At no locality was modiolaria laevigata abundant. At most places 

 the variety substriata GRAY (in. laevis BECK) was met with together 

 with the typical form, though the latter was more common than the 

 variety. I append a few measurements of both foruut typica and of 

 substriata, showing how the species varies in regard to form. 

 Forma typica: 



Rice Strait 



Gaasefjord 



Long. 



34 mm. 



26.5 



26.5 



31 

 29 











Forma substriata: 

 Gaasefjord 



Havnefjord. 



27 



33 

 29 

 20 

 19 



n 

 n 



Lat. 20 mm. 



17 



17 



19 



17 



18 

 18 



21 



W 



13 

 12 



Modiolaria nigra, GRAY. 



Locality: 



Aug. 18. 1898. Bay near Rice Strait. 

 Aug. 26. 



Sept. 20. 1900. The head of the Gaasefjord, 6-40 m. Clay with small stones. 

 Aug. 2. 1901. , about 40 m. 



Aug. 16. 



The species seems to he very scarce, since there are not more than 

 one or two specimens from any locality. 



Rice Strait Long. 35 mm. Lat. 18 mm. Crass. 11.5 mm. 



Gaasefjord 



27 



19 



45 



43.5 



38.5 



16 

 11 



24 

 23 

 20.5 



10 

 7.5 

 15 

 12 

 11 



In specimens from Rice Strait the epidermis is either olive-brown 

 or dark-brown, in specimens from Gaasefjord it is olive-brown or black. 



