CONCHIFERA. 



469 



£ 



Fig. 243. Mulleria lobata, Fer. (Original. 

 Tridacnida, p. 289. Animal of Tridaaia, as seen on removing the left 

 valve aud part of tlie mantle within the pallia! line. 



Fig. 265. Tridacii.acrocea^'LB.m. (Original), 

 a, the single adductor muscle; p, pedal muscle, and pedal opening in mantle; 

 /", the small grooved foot; h, byssus; t, labial tentacles; g, gills; I, the broad 

 pallial muscle ; between g and I is the renal organ; m, the double mantle-mar- 

 gin; s, the siphonal border; i, iuhalent orifice . e, valvular excurrent orifice. 

 An. Nat. Hist. 1855, p. 190. 



