480 EXPLANATION OF 



tube, as here represented. See note in vol. ii. p. 375. We liave 

 not been able to procure a fresh figure, as there promised. 3. Pholas 

 parva, from life. 4. Pholadidea papyracea, the siphons only, 

 after preserved specimens and a sketch by Mr. Clark. 5. Gastro- 

 chcena modiolina, and 6. Saxicava rugosa. 



Plate G. — 1. Petricola lithophaga (after Philippi). 2. Venerupis 

 irus (after Deshayes). 3. Corbula nucleus. 4 and 5. Necera aos- 

 pidata. 6. Its siphons and their appendages, greatly magnified. 

 7. The orifices of the siphons. 8. Necera costellata, and 9. its 

 foot, all from life; as also 10. Pandora obtusa. 



Plate H. — 1. Mi/a truncata. 2. Lutraria dliptica, and 2, a. its 

 siphonal apertures. 3. Lyonsia norvegica. 4. Thracia pkaseo- 

 • Una. 5. Thracia distorta. 



Plate I. — 1. Solen siliqua. 2. Solen pellucidus : these and 5. Sole- 

 curtus coarctatus (the shell reversed by mistake), with 6. its 

 siphons, are from life (E. F.). 3. Tlie siphons of Solen marginatus 

 (after Deshayes). 4. Ceratisolen legumen (shell reversed by error). 



Plate K. — 1. Psammobia tdlinella, and 1. a. its siphons. 2. Diodonta 

 fragilis (after Deshayes). 3. Tellina tenuis, and 3. a. its siphons 

 with part of mantle. 4. and 4. a. Similar figures of Tellina dona- 

 cina. 5. and 5. a. Ditto of Syndosmya intermedia. 6, Scrobicu- 

 laria piperita (lettered compressa). 7. Donax anatinws, 8. Si- 

 phons of Afesodesma, introduced for comparison (E. F.). 



Plate L. — \. Mactra elliptica. 2. Siphons of J/. soZic/a. 3. Those of 

 M. subtruncata. 4. Those of M. stidtorum. 5. Tapes pullastra, 

 and 5. a. its siphons. 6. Siphons of Vemis ovata. 7. Venus fas- 

 ciata. 8. Cytherea chione. 



Plate M. — 1. Artemis lincta (after Poli). 2. Lucinopsis inidata (from 

 sketch by Mr. Clark). 3. Circe minima (from a specimen dredged 

 in Milford Haven). 4. Cyprina idandica (the beaks are turned 

 the wrong way in the engraving). 5. Astarte sidcata, var. Danmo- 

 niensis. 6. Lucina borealis (from sketch by Mr. Alder). 7. Dip- 

 lodonta rotundata (from sketch by Mr. Clark). 



Plate N. — 1. Cardium norvegicum. 1. a. portion of the branchial 

 siphon. 2. Cardium pygmceum. 3. C.fasciatum. 4. C. echina- 

 tum, junior. 5. Siphons of C. edide. 6. Isocardia cor (after 

 Bulwer). 



Plate O. — 1. Turtonia minuta, e&Wcd p^trp^crea on the plate ; the shell 

 in this figure is reversed by mistake (see vol, ii. p. 375). 2. Monta- 

 cuta substriata. 3. Kellia rubra. 4. and 4, a. Kellia suborbicii- 

 laris. 5, Galeomma Turtoni (partly after Mittre). 6. Lepton 

 squamosum. 7. Cyclas ccdycidata. 8. Pisidium amnicum. 9. 

 Pisidiimi pusillum. The figures of Kellia and of Lepton are from 

 drawings by Mr. Alder. 



