MAZATLAN UNIVALVES 243 



tion, and closer wrinkles entering the umbilicus. On one (dead) 

 specimen however the radiating rugae are coarse, not inter- 

 rupted by spiral lines ; the periphery also is more adherent to 

 the penultimate whirl. Four (perfect) specimens only were 

 found of this exquisitely beautiful species. Long. '02, lot. '052 

 by '043. Div. about 170. 

 Hob. Mazatlan : off Spondylus calcifer, extremely rare ; 



L'pool Col. 



Tablet 1154 contains one specimen. 



304. VlTEINELLA PEEPAEVA, C. B. Ad. Var. NODOSA. 



V. t.discoided,planatd, quadratd, subhyalind; carinis duabus 

 ipiralibus infra et supra peripheriam planatam, quarum postica 

 nodosa ad marginem spiralem est ; basi rugulis radiantibus 

 distantibus ornatd ; carind parum expressd regionem umbili- 

 calem magnam circumeunte ; aperturd quadratd ; anfr. ult. 

 kaud declivi. 



Pan. Shells, no. 265, pp. 187, 316. 

 V. nodosa, P. P. C. Cat. Prov. 



The characteristic coronation of the upper keel is not men- 

 tioned by Prof. Adams ; it is however very conspicuous in the 

 specimen sent to Mr. Cuming. It is possible that the specimen 

 he described is another species, in which case the name which 

 I had given may be retained for this. It closely resembles in 

 outline a smooth, crenated Dundry Ammonite. In Mr. Cum- 

 ing's specimen, there are one and a half normal whirls ; there 

 also appears a slight labial deposit. The only specimen found 

 at Mazatlan is immature, and measures long. '0075, lat. "033 

 by '027, div. 175. 

 Hal. Panama ; 3 sp. in sand; C. IB. Adams. Mazatlan ; 



1 sp. off Spondylus ; ISpool Col. 



Tablet 1155 contains the specimen. 



305. VlTEINELLA EXIGUA, C. IB. Ad. 



V. t. siibdiscoided, albd, anfractibus iv. et triente ; carinis iii. 

 maximeprominentibus, acutis, angulatis, kaud serr at is, quarum 

 una ad peripkeriam, una antica, una postica in spird sitce sunt ; 

 angulo circa umbilicum magnum plus minusve monstrante ; striis 

 exillimis spiralibus totd superficie ornatd ; lindis radiantibop 

 plus minusve distantibus et infra et supra decussantibus, circa 



