two Forms ofHissoid Gasteropods, 349 



planis, spiralis, ad suturas acute angulatis, costelHs longltudinali- 

 bus tenuibus confertis, interstitiis lineis transversis elevatis decus- 

 satis instructis ; apertura ovata ; peritremate continuo ; labro 

 margine anguste varicoso. 



Hab. Mososeki ; 7 fathoms. 



In this rather thin species the whorls are spirate, sharply 

 angulate at the sutures, and furnished with longitudinal 

 riblets. 



6. Onoha patula, A. Adams. 



0. testa ovata, solida, rimata, sordide alba ; spira brevi ; anfrac- 

 tibus 3y, postice acute angulatis, ultimo magno, costelhs longi- 

 tudinalibus undulatis et lineis transversis elevatis concinne decus- 

 sate ; apertura oblonga, antice dilatata ; labro valde dilatato, 

 margine reflexo, undulato, postice libero et angulato. 



Hab. Yobuko, west coast of Kiusu ; 14 fathoms, mud. 



In this species the lip is greatly dilated and reflexed; the 

 whorls are sharply angulated posteriorly, and there is an elon- 

 gate narrow umbilical chink. 



7. Onoba egregia, A. Adams. 



O. testa subnlato-turrita, sordide alba ; anfractibus 6, planiusculis, 

 spiralis, postice rotundate angulatis, lamellis longitudinalibus 

 erectis undulatis, interstitiis transversim pulcherrirae striolatis in- 

 structis ; suturis profundis ; apertura aperta, ovali ; peritremate 

 tenui, continuo ; labro subdilatato, margine simplici, undulato. 



Hab. Seto-Uchi; 17 fathoms. Yobuko; 10 fathoms. 



A very charming species, with lamellar, undulating longitu- 

 dinal riblets, and the interstices crossed by fine spiral elevated 

 lines. The aperture is somewhat expanded, and there is no 

 external varix on the outer hp. 



8. Onoba lucida, A. Adams. 



O. testa turrito-subulata, alba, tenui, pellucida ; anfractibus 4, con- 

 vexiusculis, lineolis transversis elevatis concentricis confertis or- 

 nata ; apertura ovali, antice Integra ; peritremate continuo ; labro 

 margine tenui, varicoso. 



Hab. 0-Sima. 



This species resembles O. bella in 'form and sculpture ; but it 

 wants the spiral callus at the base of the last whorl, and the 

 conspicuous varix on the outer lip ; it is also much smaller and 

 more pellucid. 



