NASSA (UZITA) RKTICOSA. 517 



rapidly diminishing to a blunt point ; suture well marked butjiot deep ; ornamented 

 by wide and oblique l)ut not prominent longitudinal costae, placed close together 

 and crossed by rather strong spiral strijB, the basal portion, jJ^Avhich is also 

 spirally striated, being separated from the rest of the body-whorl by a deep 

 groove; mouth irregularly ovate with an angular notch al)Ove and ridged^within ; 

 inner lip wide, ridged and folded upon the pillar ; canal short, turning abruptly 

 to the left and ending in a deep notch. 



Divnefisions. — L. 12 mm. B. 6 mm. 



Distribution. — Not known living. 

 Fossil : St. Erth. 



Remarks. — The shell here figured is from the Warburton]jCollection in the 

 British Museum, where it T)ears the name of N. costnlata. It does not agree, 

 however, with Brocchi's figure of the N. eostulata of Renier,]and so far as I can 

 make out is an undescribed species. The sculpture, consisting of wide, flattened 

 costaB crowded together and crossed by spiral strige, is different ifrom that of any 

 Nassa hitherto described from our English deposits, though somewhat ]ike that 

 of the i\^. dicersa of Bellardi. In other respects, however, our shell is different. 



In the Warburton Collection in the British Museum there is a characteristic 

 specimen of the recent British shell Nassa reticulata, labelled from St. Erth, but 

 accompanied by a notice in Robert Bell's handwriting : " This came with Mr. 

 Wood's specimens." The locality given for it may probably have been a mistake. 



Sub-genus UZITA {continned from Vol. I, p. 66). 



Nassa (Uzita) reticosa, type (J. Sowerby). Plate XLVI, figs. 1—3 {coiUiiined 

 from Vol. I, p. 62). 



1818. Bucciimm reticosum, J. Sowerby, Min. Conch., vol. ii, p. 17, pi. ex, fig. 2. 

 1848. Nassa reticosa, S. V. Wood, Mon. Crag Moll, pt. i, p. 38, pi. iii, fig. 10 a. 



Remarks. — As to this form Sowerby and Wood are practically agreed. The 

 specimens now figured, though not absolutely the same, may be regarded as typical. 



Var. rugosa (J. Sowerby). Plate XLVI, fig. 11. 



1818. Buccinum rugosum, J. Sowerby, Min. Conch., vol. ii, p. 16, pi. ex, fig. 3. 



1844. Buccinum elongatum, var. B, Nyst, Coq. foss. Terr. tert. Belg., p. 572, pi. xlv, fig. 3. 



1914. Nassa reticosa, var. costata, F. W. Harmer, Plioc. Moll. Gt. Brit., vol. i, p. 63, pi. iii, fig. 15. 



Remarks. — In my short allusion to this interesting, abundant, but very variable 

 group of shells, I lost sight of the fact that the B. rugosuvi of Sowerby does not 

 agree with that figured subsequently by Wood under that name. Sowerby gives 

 three figures of this group, viz. of B, elongatum, B, reticosum and B. rugosum, two 



68 



