56 Christmas Island. 



3. Lamprocystis mildredsB (Smith). (PI. YIII, Figs. 5-7.) 



Ariophanta [Microcystis) mildredce, Smith, P.Z.S., 1888, p. 537. 



Testa Z. normani similis, sed minor, latius perforata, anfractibus 

 magis convexis, utrinque distinctius spiraliter striatis. Diam. maj. 5, 

 min. 4f mm. ; alt. 3 mm. 



Collected by Mr. J. J. Lister. 



This species is smaller than either of the preceding, and also is 

 more distinctly striated both above and below, and more widely 

 umbilicated. The whorls are rounder and the suture deeper. 



Family SUCCINEID^. 

 4. Succinea solidula, Pfeiffer. (PI. VIII, Figs. 8, 9.) 



Succinea solidula, Pfeiffer, P.Z.S., 1849, p. 134 ; Monog. Helic, vol. iii, p. 22 ; 

 Smith, P.Z.S., 1887, p. 578, figs. 1, 2. 



Testa ovata, pallide flavescens vel dilute rufescens, subpellucida, 

 incrementi lineis fortibus obliquis curvatis sculpta, undique minute 

 subgranulata ; anfractus 3, rapide accrescentes, perconvexi, sutura 

 obliqua sejuncti, ultimus magnus ; apertura inverse auriformis, 

 intus nitens ; peristoma tenue, vel interdum intus leviter in- 

 crassatum, margine columellari paulo incrassato, callo tenuissimo 

 labro juncto. Long. 13 mm., diam. maj. 10mm. ; apertura 9 mm. 

 longa, 6 lata. 



Another small but adult specimen is 9 mm. in length and 7 ^ in 

 diameter. 



Hah. — Flying Fish Cove (Andrews). 



There are two principal characters which distinguish this species, 

 namely, the thickened peristome and the peculiar sculpture. The 

 former is not, however, observable in all specimens, but its absence 

 may be due to their immature condition. It is only slight in any 

 of the specimens, and internal; hence Pfeiffer's expression "perist. 

 submarginatum." The sculpture has the appearance (under a 

 strong lens) of the texture of very fine linen, or minute crisscross 

 lines, rather than minute granulations. Besides this excessively 

 fine ornamentation the surface exhibits rather strong lines of 

 growth or subplications. 



5. Succinea solitaria, Smith. (PL YIII, Figs. 10, 11.) 



Succinea solitaria, Smith, P.Z.S., 1887, p. 518, figs. 3, 4. 



Testa suboblique ovata, supra acuminata, solidiuscula, vel albida, 

 versus apicem rufescens, vel omnino rubescens, lineis incrementi 

 validis, valde obliquis, curvatis, striisque spiralibus, fortibus, plus 

 minus distinctis, sculpta ; anfractus 3, rapide crescentes, duo 

 superiores perconvexi, ultimus supra declivis, antice descendens; 

 apertura rotunde ovata, supeme acuminata, intus pallida vel 



