1901.] NATURAL SCIENCES OF PHILADELPHIA. 409 



THE LAND MOLLUSKS OF THE LOO CHOO ISLANDS: CLATJSILIIDJE. 

 BY HENRY A. PILSBRY. 



Seven or eight years ago, at the time of my first studies upon 

 Japanese mollusks, only two species of Clanisilia were known from 

 the Loo Choo Islands: C. valida Pfeiffer, 1 described from speci- 

 mens collected by Largilliert, and C. prceclara Gould, 2 collected by 

 William Stimpson, naturalist of the U. S. North Pacific Explor- 

 ing Expedition, under Commanders Ringgold and Rodgers. 



Mr. Frederick Stearns brought a third species, taken on Oki- 

 nawa, which I described in 1894 as C. Stearnsii,* and a fourth was 

 sent in 1900 by Mr. Hirase, C. hyperoptyx, 4 from the same 

 island. 



Two other species, C. Bernardii Pfr. and C. ptychochila Bttg.. 

 supposed to be from Siam and China respectively, seem from their 

 characters to be so near Loo Chooan species that I think their 

 formerly assigned habitats were probably erroneous, and that both 

 really came from the Loo Choo Islands. Acting upon this 

 hypothesis, I provisionally include them in the following account. 



Through the researches conducted by my esteemed correspondent, 

 Mr. Y. Hirase, the number of species known from these beautiful 

 and interesting islands has now been increased to eleven, 5 not 

 counting the two species of doubtful provenance alluded to above. 



Up to this time we have received species from only three islands r 

 Yayeyama in the southwestern group, Okinawa or Great Luchu in 



1 Zeitschr.f. Malak., 1849, p. 106 ; Mon. Eel. Viv., Ill, p. 591. Kiister, 

 Conchyl. Cab., Clausilia, PI. 23, figs. 1-3, figures of Pfeiffer's type. 



2 Proc. Bost. Soc. Nat. Hist., VI, p. 425, February, 1859 ; Otia Conch., p. 

 103. The name prcedara being preoccupied in Clausilia, Pfeiffer changed 

 it to C. excellens, Jour, de Conchyl., p. 266 (1861), basing the new name 

 on Gould's description. 



3 Nautilus, VIII, p. 47 (August, 1894); Catal Mar. Moll. Jap., Appen- 

 dix, p. 163, PL I, fig. 12. 



4 These Proceedings, 1900, p. 446, PI. XIV, figs. 12-14. 



5 This includes the species of Oshima, as this island belongs both geo- 

 graphically and faunally to the Loo Choo group. Being politically a part of 

 Kagoshima Ken or prefecture, it is not usually considered by the Japanese 

 to be one of the Loo Choo group, which in ordinary parlance includes merely 

 the Central and Further groups of islands, belonging to Okinawa Ken. 



