44 6 



CYKENIDiE. 



in Tropical America, Australia, India, Africa, China, and the 

 Islands of the Pacific. They are found usually near the 

 coast, often buried in the mud of mangrove-swamps. 



Species of Gyrena. 



sequilateralis, Desk. 

 affinis, Desk. 

 angulata, Desh. 

 anomala, Desh. 

 arctata, Desh. 

 Bengalensis, Desh. 

 Buschii, Phil. 

 Caroliniana, Bosc. 

 Ceylanica, Chem. 

 Charpentieriana, Bourg. 

 compta, Desh. 

 conjuncta, Desh. 

 cordiformis, Recluz. 

 Cumingii, Desh. 

 cyclostoma, Bourg. 

 cyprinoides, Quoyand Gaim. 

 decipiens, Desh. 

 Deshayesiana, Bourg. 

 divaricata, Desh. 

 dura, Desh. 

 Essiugtonensis, Desh. 

 expausa, Mouss. 

 fallax, Desh. 

 Floridana, Conr. 

 Fontainei, D'Orb. 

 Galathese, Morch. 

 Gauritziana, Krauss. 

 impressa, Desh. 

 incerta, Desh. 

 inflata, Desk. 

 inquinata, Desh. 

 insignis, Desh. 

 isocardioides, Desh. 



Jukesii, Desh. 

 lauta, Desh. 

 mactroides, Desh. 

 maritima, C. B. Adams. 

 Moquiniana, Bourg. 

 nitida, Desh. 

 uitidula, Desh. 

 notabilis, Desh. 

 oblonga, Quoy and Gaim. 

 oviformis, Desh. 

 pallida, Desh. 

 Papua, Less. 

 Peruviana, Desh. 

 Petitiana, Bourg. 

 placens, Hartley. 

 placida, Desh. 

 radiata, Hartley. 

 Eaymondi, Bourg. 

 salmacida, Morel. 

 siinilis, Desh. 

 sinuosa, Desh. 

 solida, Phil. 

 sordida, Hartley. 

 sublobata, Desh. 

 suborbicularis, Phil. 

 subquadrata, Desh. 

 Sumatrensis, Sow. 

 triangula, Phil. 

 triangularis, Metcalfe. 

 turgida, Lea. 

 Vanikorensis, Quoy and 



Gaim. 

 ventricosa, Desh. 



