294 DENTALITJII. 



Dimensions. — Length .53 mm. ; width of anterior aperture 7 mm. 

 Form, and Loc. — Eocene and Miocene : Australia and IS^ew 

 Zealand. 



48052. Several examples ; from Hobson's Bay. Purchased. 



73219. A series of specimens showing variability of the 

 external ornament ; from Brighton, Victoria. Purchased. 



G. 4283. Three examples of the adult ; from Muddy Creek. 



Presented hy John Dennant, Esqt 



G. 9140. A variation in which the longitudinal costae are closeri 

 together than in typical specimens ; from River Murray cliffs. 



Presented hy Wm. Evans, Esq. 



G. 9387. Four examples of the adult, exhibiting minor varia- 

 tions in external sculpture and in the proportional width of thel 

 anterior aperture ; from Muddy Creek. Purchased.\ 



G. 10253. Having lines of growth rather oblique, and producing 

 slight granulation at the points of intersection with the longitudinal! 

 costae; from the " CoK;<.s-beds," Mokihinui. Sir James Hector Coll. 



G. 10254. Examples of the neanic st;ige of growth, in a block] 

 of shelly argillaceous limestone ; from Duncan's, New Zealand. 



Sir James Sector Coll. 



G. 10258. Specimen having broad and prominent longitudinal! 

 costae, probably the D. irregularis of Hutton ; from Awamoa. 



Sir James Hector Coll. 

 G. 10260. Several specimens of the adult ; from Onekakara. 



[_Old Collection.l 



Dentalium giganteum, G. B. Sowerby. 



18i6. Bcntalium gigantemn, G. B. SoweAy, in Darwin, Geol. Obs. etc.. 



South America, p. 263, pi. ii. fig. 1. 

 1873. Dentalium solidum, Hutton, Cat. Tert. Moll. X.Z. p. 2. 



Shell large, nearly straight, solid, longitudinal sulci numerous, 

 the interstices being rounded ; in many specimens the annular 

 striae of growth are undulating, whilst encircling ridges are not 

 infrequent ; none of the specimens exhibit a posterior fissure. 



I), solidum, Hutton, appears to differ from the present species 

 in having more numerous longitudinal sulci, which, however, 



