232 MR. A. ADAMS ON JAPANESE OBELISCIN^. [NoV. 11, 



floor of sand or sandy mud ; tl:ey are very difficult to obtain aliv^e, 

 the shells forming the subject of this paper having been obtained, 

 for the most part, from an examination of shell-sand. The animal 

 of Syrnola cmctella crawls rapidly. It is of a semipellucid white, 

 with the upper surface of the mentum flecked with opake white ; the 

 tentacles are broad and triangidar, with the eyes between them very 

 close together; the mentum is greatly elongate, and bilobcd at the 

 end ; and the foot is narrow. This species lives in two fathoms' 

 sandy mud at Takano-Sima, a small island on the cast coast of Japan. 



Genus Obeliscus, Montf. 



1. Obeliscus pulchellus, A. Ad., Sow. Thes. Mon. Obel. 

 ph 171. fig. 20. 



Ilab. 0-Sima ; Yobuko ; Mososeki. 



2. Obeliscus teres, A. Ad., Sow. Thes. Mon. Obel. pi. 171. 

 figs. 31, 32. 



Hah. Mino-Sima. 



3. Obeliscus balteatus, A. Ad., Sow. Thes. Mon. Obel. 

 ph 171. fig. 2;"). 



Hah. Yobidvo ; Uraga. 



4. Obeliscus pusillus, A. Ad., Sow. Thes. Mon. Obel. pi. 171. 

 fig. 7. 



Hah. 0-Sima; Takano-Sima. 



5. Obeliscus nitidxtlus, A. Ad. 



Syrnola nitidvla, A. Ad., Ann. Nat. Hist. 1860, vi. 335. 

 Hah. Mino-Sima, C3 fathoms ; O-Sima, 25 fathoms. 



6. Obeliscus vitreus, A. Ad. 



Syrnola vitrea, A. Ad., Annals, 1860, vi. 335. 

 Hah. Uraga ; Tsu-Sima. 



7. OBELitScus trifasciatus, a. Ad. 



O. testa acuminato-conoidea, cornea, tenui, semipellucida, vitrea ; 

 anfractihus normalibus 7, phtnivscidis, fasciis trihus rvjls trans- 

 versis ornatis, suiuris exaratis, apertura ovata ; plica strprema 

 valida transversa, plica inferiore parva inconsp)icua ; lahro in- 

 tus liruto. 



Hah. Uraga; Mososeki. 



This species resembles O. niiidvlvs in form ; but the whoils, in 

 all my specimens, are adorned with three transverse bands. 



8. Obeliscus eburneus, A. Ad. 



O. testa suhulato-aciculata, elurnea, solida, opaca, Ictvi ; anfrac- 

 tihus normalibus circa 10, planidatis, sidcis lonyitiidinalihus hie 



