PLATE I. 



Teredo. Pierces and inhabits wood. 

 Fig. 



1. T. navalis, Linn. — T. Batava. — Heme Bay, R. Pallets shelly 



crescented ; valves with auricles extended sidewise ; tube long. 



2. T. norvegica, Spengl. — T. Bruguieri. — Port Patrick, Teignmouth, 



etc., Mc. Pallets shelly, not crescented ; auricles not extended. 



3. T. megotara, Hani. — T. nana (young) . — Heme Bay, Devon, 



Swansea, etc., R. Pallets shelly, spade-shaped ; auricles raised 

 and expanded. 



4. T. bipennata, Turt. — Ireland, Scarborough, etc., R. Pallets horny, 



long ; auricles lobed. 



5. T. malleolus, Turt. — Torquay, Rr. Pallets shelly, rnallet-shaped ; 



valves narrow. 



6. T. palmulata, Lamh. — T. Ivpalmulata. — Moating wood, Ire., S. 



Eng. Pallets horny, short ; valves small, shaped like T. navalis. 



Xylophaga. In fixed and floating timber. 



7. X. dorsalis, Turt. — Ayrs., Dubl., Exm., Scarb., etc., C. Two 



dorsal plates, no tube, no pallets. 



Pholas. Pierces and inhabits stone. 



8. P. Dactylus, Linn. — P. /dans, P. callosa. — Eng., Scot., Ire., C. 



Dorsal plates four ; hinge pitted. 



9. P. Candida, Linn. — Eng., Scot., Ire., C. One dorsal plate; valves 



not beaked. 



10. P. parva, Penn. — P. callosa, P. tuberculata. — Salcombe, Belfast, 



Cornwall, etc., M. C. One dorsal plate ; valves beaked. 



11. P. crispata, Linn. — P. bifrons. — Hastings, Liverp., Scarb., Dubl., 



Forth, etc., C. No dorsal plate; valves broad, beaked, with 

 oblique division. 



13. P. striata. Rare and doubtful as British. Valves closed. 



Pholadidea. Pierces and inhabits stone. 



12. P. papyracea, P. Loscombiava,P. Goodalli. — S. Devon, N. Ire., R. 



Valves closed, with a cup. P. lamellata, Turt., when young, 

 not closed ; no cup. 



GastrocHjENA. Bores and inhabits stone, thick shells, etc. 



14. G. modiolina, Lamh. — G. Pholadia, G. /dans, Mya dubih, Mytihis 



ambiguus, Pholas f aba. — Torbay, Birterbuy, Galway, Weymouth, 

 etc. Valves thin, gaping, enclosed in bottle-shaped tube. 



b 



