THE LAND IN CERTAIN PARTS OF SWEDEN. 



35 



Names. 



8. Rissoa parva. {Turbo 

 parvus, Mont.) 



9. Neritinajluviatilis. 



10. BuUmus lubricus. 



Observations. 



selected from the different localities of fossils before men- 

 tioned near Stockholm. In var. a there are five volutions, 

 which are of a squarish form ; in var. b five, which are 

 rounded ; and in var. c six, which are rounded. On com- 

 paring a great number of individuals, there appeared to be 

 so many passages from one form to another as to render 

 it difficult, if not impossible, to establish distinct species. 



I found at Brankyrka a few individuals which Mr. Gray 

 referred to this species. 



A small black variety of this species was met with at 

 Brankyrka, which I also saw recent in abundance on the 

 shores of Moen, in Denmark. Dr. Beck, of Copenhagen, 

 regards it as a distinct species. It is smaller than the 

 same shell living in fresh water. I found some varieties 

 both fossil at Brankyrka and recent at Graso, near Gefle, 

 which had the ordinary colours of the N.JiuviatiUs. 



Fossil at Brankyrka. (See page 6.) 



List of Fossil Shells from Uddevalla, on the West Coast of Sweden. 



Names. 



1. Pholas crispata. 



2. My a truncata. 



3. Anatina my alts, Lam. 

 {My a pubescens, Turt. 

 Llgula pubescenSj Mont.) 



4. Saxicava rugosa. {My- 

 tilus rugosus, Mont.) 

 PI. II. figs. 24—29. 



Observations. 



I met with one valve only of this species, at Capell- 

 backen, near Uddevalla. 



Found in very great abundance around Uddevalla. 



I met with one very perfect specimen, with its liga- 

 ment, fossil near Uddevalla. 



The small individuals, figs. 28, 29., would be called by 

 some conchologists Hiatella arctica ; but many natural- 

 ists are now of opinion that the shells called Saxicava or 

 Hiatella rugosa {Mytilus rugosus, Linn.), and the Hia- 

 tella arctica, are not specifically distinct ; and the fossils 

 which I collected in great abundance at Uddevalla con- 

 firm me in this opinion. This shell is more abundant 

 perhaps than any other, and some individuals are of great 

 thickness, and must evidently have been very aged (see 

 fig. 27.)- I never found any of them lodged in cavities in 

 f2 



