MAZATLAU TTKITALVES 395 



fundo, ad aperturam contracto, spiram suhascendente, callo 

 parietali minore ; zona translucidcs carente. 



Tvro perfect specimens and one broken were found of this 

 species, which resembles D. aspera, Hinds, and D. thiarella, 

 Val. but does not accord in sculpture with either. It is known 

 at once from D. ateri'ima by the position of the slit, which is 

 much nearer the suture and slopes upwards. This causes more 

 of the tubercles to be seen on the spire. Long. '64, long. spir. '4, 

 lat. -26, div. 35°. 



Hab. — ]\Iazatlan ; 3 sp. only ; L'pool Col. 



Tablet 1897 contains the perfect specimen. In the young 

 shell, the slit is quite close to the suture. 



463. Deihia zouulata, Itve. 



Pleurotoma cincta. Sow. Proc. Zool. Soc, 1833, p. 136. (Non 

 IJam. An. s. Yert. vol ix. p. 347, no. 8 : — Kien. Icon. Conch. 

 p. 60, no. 38, pi. 19, f. 3. Mauritius.) 



Pleurotoma zonulata, Rve. Conch. Syst. 1848, pi. 234, f. 10 : — 

 Conch. Ic. pi. 6, f. 39.— C. B. Ad. Pan. Shells, p. 148, no. 184. 



Crassispira (DriUia) zonulata, H. Sf A. Ad. Gen. i. 91. 



This pretty little species is known from D. aterrima, not only 

 by the yellow neck-lace on the spire and the yellow belt on the 

 base, but by the comparative smoothness of the infrasutujal 

 groove, and the shape of the tubercles, Avhich are very narrow, 

 but greatly elongated spirally. Long. *65, long. spir. '39, 

 lat. -25, div. 35". 



Sah. — Monte Christi and Xipixapi ; in sand and gravel 7 fm. ; 

 Cuming.— FsLXi.dt.mdk ; 2 sp. C. B. Adams. — Mazatlan ; 1 sp. ; 

 Upool Col. 



Tablet 1898 contains the specimen. 



464. Deillia monilifeea, n. s. 



D. t. turrita, nigrd, auraniio geminatci, ; anfr. subplanatis, 

 omnino minutissime et confertissime spiralifer striulatis ; regione 

 hifra-suturali haud excavata ; stria juxta suturam vix tv.hercU' 

 lata ; circa peripheriam zond aurantia-cd, tuberculis parvis, 

 circiter xii. ornatd ; et infra, striis sjnralibus, circiter v., tuber- 

 culis minimis convenientibus ; tuberculis omnibus et striis 

 plerumque axirantiacis ; aperturd intus, nisi ad zonam subdia- 

 phanam, purpureo-nigrd. 



