Vmhonudad from the Seas of Japan. 265 



2. Umbonium giganteum, Lesson. 



Rotella gigantea. Less. lUust. de Zool. pi. 17. 

 Globulus giganteus, Phil. 

 Rotella aucta. Sow. 



Hab. 0-Sima, 



3. Umbonium costatum, Valenc. 



"Rotella costata, Val. Kien. Sp. Conch, viv. pi. 11, f. 5. 

 Globulus costatus, Phil. Conch. Cab. pi. 7. 1. 15. 



Hob. Simoda; Hakodadi; Tsu-Sima; Tsaulian. 



4. Umbonium moniliferum, Lamk. 



Rotella monilifera, Lamk. Hist, des Ann. s. Vert. vol. vii. p. 8. 



Rotella javanica, Lamk. 

 Globulus monilifer, Phil. 



Hab. Nagasaki; Simoda; Tatiyama; 0-Sima; Tago. 



5. Umbonium anguliferum, Phil. 

 Globulus anguliferus, Phil. Conch. Cab. pi. 8. f. 3. 



Hab. Simoda. 



6. Umbonium superbum, Gould. 

 Rotella superba, Gould, Otia Conch, p. 156. 



Hab. Kagosima. 



Genus Microthyca, A. Adams. 



Testa globoso-turbinata, late umbilicata, subporcellana, longitudi- 

 naliter rugoso-plicata ; suturis canaliculatis ; anfractibus ad suturas 

 crenulatis. Apertura semicircularis, peritremate continuo ; labio 

 incrassato, arcuato ; labro margine incrassato ; umbilico creaulato. 



1. Microthyca crenellifera, A. Adams. 

 Isanda crenellifera, A. Adams, Ann. & Mag. Nat. Hist. 1862. 

 Hab. Gotto Islands, 71 fathoms; Seto-Uchi, 17 fathoms. 



In this curious little form, which I referred to Isanda (not 

 having the type of that genus to compare with it), the peritreme 

 is continuous, and the outer lip thickened — characters which 

 prevent its being referred to any existing genus. 



Genus XJmbonella, A. Adams. 



Testa globoso-conoidea, solida, porcellana, polita, anguste umbili- 

 cata. Apertura subquadrata; labio rectiusculo, autice dilatato; 

 umbilico angusto, margine crenulato-rugoso. 



1. Umbonella murrea, Reeve. 



Turbo murreus, Reeve, Conch. Icon. sp. 54. 



Isanda maculosa, A. Adams, Ann. & Mag. Nat. Hist. 1862. 



Hab. Gotto Islands; 71 fathoms. 



Ann. ^ Mag. N. Hist. Ser. 3. Voixi. 18 



