396 MAZATL3LN UNIVALVES 



Only one specimen, not quite mature, was found of this 

 species, which resembles D. aterrima, zonulata, &c. but is 

 easily recognized by the non-excavation and extremely faint 

 keeling of the area of the sinus ; and the colour, which pre- 

 sents one large and several nanute rows of connected orange 

 tubercles upon a black ground. Long. '64, long. spir. '41, 

 lat. '23, div. (anfr. prim.) 30. 

 Hob. Mazatlan ; 1 fresh adolescent sp. ; L'pool Col. 



Tablet 1899 contains the specimen. 



465. DEILLIA ALBOVALLOSA, n. s: 



D. t. adolescente subturritd, nigrd ; costd rotundatd, albidd, 

 expressd, spiram ascendente ; marginibus spires subincurvatis ; 

 totd superficie confertim spiraliter striulatd, striulis in aream 

 sinus haud excavatam magis expressis ; costd albd suturam 

 approximate, haud attingente, undato-tuberculatd ; serie tuber- 

 culorum, circiter xvii., angustorum, radiatim elongatorum, vix in 

 spird monstrante ; striis spiralibus circa basim, quarum super- 

 lores tuberculoses, tuberculis alteris convenientibus : t. adultd 

 anfr. iii.--iv. omnino costce albes carente ; vice ejus serie tuber- 

 culorum infrasuturalium, tuberculis peripherialibus anfractus 

 alterius convenientium ; anfr. ult. parum descendente ; mar- 

 ginibus spir a excurvatis ; aperturd subovali ; sinupostico lato, 

 haud profundo ; nigro-fuscd, prope sinum posticum maculis 

 subdiaphanis ornatd. 



Only one specimen of this shell was found in the Mazatlan 

 collection. The spire is rather compact, last whirl somewhat 

 projecting, white band not quite touching the suture, and 

 peripheral tubercles shewing more in the early than in the 

 latter whirls. A specimen of unknown locality in Dr. Gould's 

 collection appears to be conspecific, but is larger, spire rather 

 more elevated, markings not so decided (perhaps rubbed) and 

 with the band smooth and yellowish. A shell however appears 

 in the Cumingian Museum, of uncertain history, which begins 

 exactly like the Mazatlan specimen, with the white ridge 

 round about six whirls ; after which it suddenly changes, 

 developing three whirls and a half without any white ridge, 

 and presenting the general appearance of D. rudis. Even this 

 specimen is not quite mature, as is shewn by the sharp un- 

 formed labruin. The faint, semi-transparent spots above the 

 tubercles round the periphery are only seen by holding the- 



