Saxicava. Bores and inhabits stone. 



Fig. 



15. S. EXJGOSA, Linn. — Mytllus r., Hiatella r., S. galUcana, S. p/wladis, 



Byssomya plwladh, Mi/a byssifera. — Eng., Scot., Ire., C. Valves 

 oval. 



16. S. ARCTiCA, Linn. — (Mya) Hiatelia a., Anatina a., Lliatella minuta, 



Solen minutus, S. r/wmboides, Agina purpurea, Solen p. — Eng., 

 Scot., Ire., C. Valves rhomboidal ; angle serrated. 

 Omitted. — S. fragilis, Nyst. Not the young of S. rtigosa. Vigo Bay. 



Petricola. Inhabits stone. 



17. P. LiTHOPHAGA, Betz. — P. striata, eosteUata, rocellaria, ruperella, 



Lamk., Mya and Sjihania decussata. — Cork, Bristol, E. as British. 



Veneeupis. Bores and inhabits stone. 



18. V. Irus, Linn. (Donax). — Tellina cornubiensis, Cunem foUaceus, 



Petric, and Pullastra, l.-^ln limestone at Plymouth and other 

 southern coasts. Wedge-shaped. 



Mya. Burrows in mud and sand. 



19. M. truncata, Linn. — M. ovalis and Splmnia Swainsoni (young). 



— Various localities and depths, C. Truncated at end. 



20. M. ARENARIA, Linn. — Heme Bay, Portsmouth, etc., C. Tapering 



at end. 



Panop^a. Burrows in mud. 



21. P. NORVEGiCA, Spengl. — P. glycimeris, P. arctica. — Scarborough, 



Zetland (90 fath.), Kr. Quadrate. 

 21*. P.ALDR0VANDi,i;a»2,f-. — Cornwall, ouc Specimen, Je^^-gj'*. Oblique. 



CoRBULA. Dredged in mud and sand. 



22. C. NUCLEUS, iawzX-. — C. striata, Mya, zwi. C.incequivalvis. — Dubhn, 



Torquay, Forth, 4 to 80 fath., C. Valves unequal, beaked. 



23. C. ROSEA, Broivn. — Weymouth, Er. as Brit. Valves not beaked. 



24. C. OVATA, Forbes. — Isle of Man, Er. Oval, truncated at end. 



Sph^nia. Burrows in foliaceous sheUs. 



25. S. BiNGHAMi, Turt. — Corhula B. — Torquay, Guernsey, Swansea, 



Forth, etc., E. 



Ne^ra. Lives incrusted in sand. 



26. N. cosTELLATA, BesJi. — Corbula c. N. sulcata. — Loch Fyne, Er. 



Eadiately 3-ribbed. 



27. N. ouspiDATA, Olivi. — Forth, Northumberland, Cape Clear, etc., 



Mr. Pear-shaped. 



28. N. ABBREViATA, Forbes. — Loch Fyne, Mc. Eadiately 1-ribbed. 



