ADBORBIS.— Plate I. 



Thi; depressed Apeorbis. Shell brond, much depressed, 

 smooth; spire rather flat; whorls scarcely exserted ; 

 umbilicus moderate ; aperture small subovate. 



A. Adams. Ann. and Mag. of Nat. Hist., 18C1. 



JIab. Mino-Sima, Japan. 



Species 7. (Fig. a, h, Mus. Brit.) 



AoEORiiis PLANORBULA. Adc. testd viildc dcpressLi ; 

 tijrird fere planoi'buld ; anfractibus rotundis, ultmo 

 lato ; umbiLico maximo ; apertvrd fere rotundd. 



The planorbular Adeorbis. Shell much depressed ; 

 spire nearly pknourblar ; whorls round, the last 

 broad ; umliilicus very large ; aperture almost 

 round. 



A. Adams ( Cyclostrema). Froc. Zool. Soc, 1850. 



//(///. I'hilippines. 



Species 8. (Mus. Adams.) 



Adi:oi;bis tkochula. Ade. testd trochifoiini^ subelevatd ; 

 spird conicd, anfractibus hand promineniibus, 

 superne declivibus ; umbilico parvo, costd circum- 

 scrijitd ; aperturd subrotundd. 



The little-top Adeorbis. Shell trochiform, rather 

 elevated ; spire conical, whorls not prominent, 

 sloped above ; umbilicus small, defined by a rib, 

 aperture rather round. 



A. Adams, Ann. and Mag. of Nat. Hist., 18G3. 



Ilab. Gotto Islands, Japan. 



Species 0, (Mus. Brit.) 



Adeorbis orbklla. Ade. testd moderate depressd ; 

 spird depresso-conicd ; anfractibus siipeme subde- 

 rlivibzis ; umbilico maximo, circvmscripto ; aperturd 

 obliqud, subrotundd. 



The small-orb Adeorbis. Shell moderately depressed 

 spire depressed, conical ; whorls sloped above 

 umbilicus very large, defined ; aperture obhque 

 rather round. 



A. AnA.MS. Ann. and Mag. Hist. Nat., 18C1. 



Hab. Mino-Sima, Japan. 



Species 10. (Fig. a, b, Mus. Adams.) 



Adeorbis carinata.. Ade. testd depressd, spi/d siib- 

 planatd : anfractibus distiiictis, rotundatis, ultimo 

 versUs suturam gibboso, infra plaradatu, infra 

 carinato ; umbilico magno ; aperturd oblique 

 siibquadratd, infra ad margiiiem externum ros- 

 tratd. 



The keeled Adeorbis. Shell depressed, spire rather 

 flattened ; whorls distinct, rounded, last gibbous 

 towards the suture, flattened below, keeled at the 

 base ; umbilicus large ; aperture rather obliquely 

 squared ; beaked below at the outer edge. 



A. Adams. Ann. and Mag. of Nat. Hist., 18C3. 



Hub. Seto-Uchi, Javian, 



