242 MR ROBERT MACLAURIn's LIST OF SHELLS. 



Sphenia Swainsonii {common) Solen ensis (common) 



Anatina pubescens (very common) pellucidus (rare) 



Psammobia ilorida (not cominon) Hiatella rugosa {not rare) 



Ferroeusis (common) arctica (not common) 



Solen siliqua (cominon) Pliolas crispata (very rare) 



Of the Pholas crisjjata I have seen a living specimen, which is now 

 in the possession of Mr J. Duncan, Eyemouth. The whole of the 

 shells in the preceding list have been found in a living state, with the 

 exception of Area fusca, Pectuuculus pilosus, Cardium hevigatum, 

 Mactra stultorum, Venus cassina, and Mya truncata. They have 

 been procured principally from the fishermen's lines. The coast 

 where they live is very rugged, and very unfavourable to the growth 

 of such sj)ecies as prefer quiet and sheltered sandy shores. We thus 

 find, that the distribution of the Mollusca is quite characteristic of the 

 district. Donax trunculus, Tellina tenuis and solidula, Mactra stul- 

 torum, and Amphidesma compressa, which are abundant on every 

 sandy beach in the kingdom, are of comparatively rare occurrence 

 with us. A stripe of sand, a mile from the shore, runs east and west, 

 from St Abbs. This abounds with Mactra solida and elliptica, Cras- 

 sina compressa, Lucina radula, Tellina crassa, Pecten obsoletus, 

 Cardium edule, Cytherea exoleta, Solen siliqua and ensis. 



Beyond this, and extending many miles in breadth, the bottom of 

 the sea consists entirely of >nud, or of mufl and sand. This habitat, 

 though far from being so rich in species as the'former, is preferred by 

 Venus decussata and perforaus, Mya truncata, Lutraria elliptica, and 

 Modiolus vulgaris, which last obtains a great size, frequently growing 

 seven inches long. 



As we go farther from the shore the mud disappears, and we come 

 to a rocky bottom which is adjacent to the cod banks. In this situ- 

 ation we find Cardium echinatum, Cyprina Islandica, Venus cassina, 

 &c. The cod banks are the abode of Pecten maximus and opercularis, 

 together with many species which abound in the first mentioned bed. 



EoTTBOLLiA INOURVATA, Yax. fiUformis. This grass has been found 

 on the Links beyond Groswick, N. Durham, plentifully, by Miss E. Bell 

 and Miss Hurt on. 



Erratum in last JSfo. of Transactions of Berwickshire Naturalists^ 



Cluh. 

 Page 180, line 3 and 4 from top, for perhaps read pai'ticularly. 



