480 EXPLANATION OF 



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

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

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

 after preserved specimens and a sketch by Mr. Clark. 6. Gastro- 

 chcena modiolina, and 6. Saxicava rugosa. 



Plate G. — 1. Petricola lithophaga (after Philippi). 2. Ve7ierupis 

 irus (after Deshayes). 3. Corhida nucleus. 4 and 5. Necera cus- 

 p>idata, 6. Its siphons and their appendages, greatly magnified. 

 7. Tlie orifices of the siphons. 8. Necera costcUata, and 9. its 

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



1'late H. — 1. 3/i/a truncata. 2. Lutraria dliptica, and 2. a. its 

 siphonal apertures. 3. Lyoiisia norvegica. 4. Thracia phaseo- 

 lina. 5. Thracia distorta. 



Plate I. — 1. Solen siliqua. 2. Solen peUucidus : these and 5. Solc- 

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

 siphons, are from life (E. F.). 3. The siphons oi Solen marginatus 

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



Plate K. — 1. Psammdbia tellineUa, 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 Syndo.vnya intermedia. 6. Scrobicu- 

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

 phons oi Mesodesma, introduced for comparison (E.F.). 



Plate L, — \. Mactra dliptica. 2. Siphons of i/. so^z'c^a. 3. Those of 

 M. s%ibtruncata. 4. Tliose of M. stultorum. 5. Tapes pulla^tra, 

 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 undata (from 

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

 in Milford Haven). 4. Cyprina islandica (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. edv.le, 6. Isocardia cor (after 

 Bulwer). 



Plate O. — 1. Turtonia minuta, called pewpwrea on the plate ; the sliell 

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

 cuta svhstriata. 3. Kellia rubra. 4, and 4. a. Kellia suborbicu- 

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

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

 Pisidium jnisillum. The figures of Kellia and of Lepton are from 

 drawings by Mr. Alder. 



