298 Mr. A. Adams on new Species of Alaba. 



24. Alaba subangulata, A. Ad. 



A. testa ovato-conica, tenui, viridula, lineis transversis rufescentibus 

 interrupts, et maculis rufescentibus irregularibus, ad suturas, or- 

 nata ; anfractibus planiusculis, transversim crebre sulcatis, ultimo 

 ad peripheriam subangulato ; apertura quadrato-circulari, antice 

 producta et effusa ; labio tenui, recto; labro margine, in medio, 

 obtusim angulato. 

 Hab. Tsu-Sima; 16 fathoms. 



A thin species, with subangular periphery, most nearly re- 

 sembling A. picta. 



Subgenus Diala, A. Ad. 



Testa Cinguloidea, vitrea, subopaca, transversim striata vel sulcata ; 

 anfractibus non varicosis, vertice subacuto. Apertura ovata; labio 

 antice non truncato. 



1 . Diala varia, A. Ad. 



Annals, 1861. 



Hab. Awa-Sima ; Takano-Sima ; Tanabe. 



2. Diala suturalis, A. Ad. 



Monoptygma suturalis, A. Ad., Sow. Thesaur. Mon. Monopt. pi. 1/2. 

 figs. 31, 33. 



Hab. Philippines ; Port Adelaide. 



3. Diala sulcifera, A. Ad. 



D. testa ovato-conica, alba, rufa aut fusca, interdum variegata ; an- 

 fractibus 5, convexis, transversim sulcatis, sulcis impressis, regu- 

 laribus, suturis profundis ; apertura oblonga ; labio arcuato, saepe 

 rufo tincto ; labro margine crenulato. 



Hab. O-Sima; Tanabe. 



This is a smaller and more ovate species than D. varia, with 

 the whorls transversely deeply sulcate. It occurs in the Lanri- 

 narian zone, in the society of D. varia. 



4. Diala rufilabris, A. Ad. 



D. testa elato-conoidali, spira attenuata, lfevi, solida, polita, straminea, 

 peritremate aurantiaco ; anfractibus 7|, planis, simplicibus, ultimo 

 ad peripheriam obtusim angulato ; labio iucrassato ; labro margine 

 subincrassato. 



Hab. Port Lincoln. Coll. Cuming. 



A simple, conical, straw-coloured species, with an orange- 

 coloured peritreme. 



5. Diala lauta, A. Ad. 



D. testa elevatim conica, albida, lineis runs interruptis transversis 

 ornata ; anfractibus 7, planis, transversim sulcatis, suturis exaratis, 



