182 LOO CHOO MOLLU8K8. 



Tridacna squamosa Lam. 



Itoma Jima Is. 13 young shells, 4" to 3i" long. 

 Tridacna crocea Lam. (=T. scapha Meusch.). 



Itoma Jima Is. 15 shells, from 5" in length down to 3*" 

 Tridacna elongata Lam. 



Itoma Jima Is. . 26 shells, 1-9" long, the rest from 6" down to 3" 

 in length. Native name, Aji-gai. 

 Tridacna elongata Lam. 



Var. smaller than the type ; more elongated and carved at the 

 basal opening. 13 specimens, from 6" to 3" long. 



Hippopus maculatus Lam. 



Itoma Jima. 9 shells, from 6i" to 4" long. 



CARDIIDJE. 



Cardium flavum Linn.* 

 Cardium rugosum Lam.* Yaeyama. 

 Cardinm (Serripes) muticum Kve. 

 Yaeyama. 6 large shells. 



Hemicardium cardissa Linn. 



Hirame Jima Is. 47 fine live shells, from 7 cm. down to 4 cm. 

 Native name, Avi-gai, so named after the leaf of the Avi plant, 

 which is the crest of the Tycoon. 



Hemicardium unedo Linn.* Ohon-me Is. 



CORBIDJE. 



Corbis 



LUCINID2E. 

 Lucina exasperata Reeve.* 



Yaeyama Is., Loo Choo group. 



Shell externally like L. exasperata, but less compressed, the diam- 

 eter half the length, with wider lunule. Interior having the surface 

 within the pallial impression most minutely roughened, outside of 

 the pallial impression polished and shining. 



Length 80, width 74, diam. 40 mm. . 



Length 50, width 40 A, diam. 24 mm. 



Of this form, two specimens are before us, the smaller one from 

 Okinawa Island (Yaeyama), the larger procured in Japan, locality 

 unknown. The smaller shell is yellow within, with a white border, 



