XXXIl. 
Family Teredinide. 
Genus Teredo, L. 
Family Gastrochenide. 
Genus Gastrochena, Spengler. 
Anatinacea. 
Family Anatinide. 
Genus Cochlodesma, Couthuoy. 
Thracia, (Leach) Blainville. 
Family Pandoride. 
Genus Pandora, Brug. 
Family Lyonsiide. 
Genus Lyonsia, Turton. 
Poromyacea. 
Family Poromyide. 
Genus Poromya, Forbes. 
Family Cuspidariide. 
Genus Cuspidaria, Nardo ( = Newra). 
It will be observed that the genus Avinus has been replaced by 
Ptychina, inasmuch as Kirby has previously made use of the name in 
1817, Sowerby’s genus not being published until 1821. Cyprina has been 
replaced by Arctica, since the former:had been previously used by 
Linneus in Fishes. Similarly Newra (Gray, 1834, non Robineau 
Devoidy, 1830) has been replaced by Cuspidaria ; and the shell usually 
called Amphidesma castaneum has been valled Ervilia nitens, Mont. 
Other changes have been dealt with in the systematic portion. The 
genus Savicava might with advantage be provided with a sub-genus 
Panomya, Gray, for S. norvegica. 
