88 KELLIAD^E. 



The undermentioned references have not occurred on the 

 South Devon coasts. 



L. SPINIFERA, Montagu. 



L. spinifera, Brit. Moll. ii. p. 49, pi. 35. f. 1. 

 L. LEUCOMA, Turton. 



L. leucoma, Brit. Moll. ii. p. 57, pi. 35. f. 2, as L. lactea. 

 L. FERRUGINOSA, Forbes. 



L.ferruginosa, Brit. Moll. ii. p. 60, pi. 34. f. 1, magnified. 

 L. DIVARICATA, Linnaeus. 



L. divaricata, Brit. Moll. ii. p. 52, pi. 35. f. 3. 



KELLIAD^E. 



This group of minute bivalves has lately been distributed 

 in five genera, Kellia, Montacuta, Galeomma, Lepton, and 

 Turtonia, but the four latter are so generically discordant 

 with Kellia (proper), the type, that we may say they have no 

 connection with it. We have therefore, without hesitation, 

 removed Galeomma and Lepton to the Arcada ; Montacuta, 

 for one of its species, to the new family of the Montacutidce -, 

 and Turtonia, for its only species, to another new family, the 

 Turtoniadce -, under which heads our reasons for these changes 

 will be found. The lately acquired knowledge derived from 

 an examination of all the Leptons except L. Clarkia, impera- 

 tively requires a family rectification ; they have not the vivi- 

 parous and tubular specialties of Kellia, and exhibit such 

 other different characters and structure as fully to sanction 

 the junction of Lepton with Galeomma, and the removal of 

 both to the Arcadce. 



Again, with respect to Montacuta, we have relieved it of 

 one of its late members, by consigning the M. bidentata to the 

 Anatinidae, as by the testaceous moveable ossicle it certainly 

 belongs to that family, which we confidently think will obtain 

 another recruit in M . ferruginosa ; that is, if it should be found 

 to have the characteristic ossicle of the tribe. The Kelliadce, 

 therefore, in our method, consists of only one genus, Kellia 

 (proper), with two species. 



