244 



Solarium acutum, Tenison-Woods. 



[Plate VII. Figs. 6a-c.] 



1879. Solarium aciUinn, Tenison-Woods, Proc. Linn. Soc. N.S.W. vol. iii. 



p. 236, pi. xxi. fig. 11. 

 1893. Solarium acutum, Tate, Trans. Eoy. Soc. South Aust. vol. xvii. pt. 1, 



p. 222. 



Shell thin, discoidal ; spire depressed, periphery acutely carinate, 

 spiral lineations granulose ; base depressed so as to form a broad 

 gutter following the peripheral keel, with several simple, small 

 lineations crossed by closely-set undulating lines of growth ; 

 inside this plain depressed portion, towards the umbilicus, are 

 seven rows of spiral granulations, the first one (outside) consisting 

 of minute elongate ridge-like elevations, the longer axis pointing 

 towards the centre ; then follows the second row, in which the 

 granulations or ridges are of the same shape but much larger ; ia 

 the third row the granules are a little smaller and farther apart; 

 in the fourth row the granules are much larger ; the fifth row 

 has very minute granules, the sixth and seventh progressively 

 larger, the largest of all bordering the umbilicus ; the umbilicus 

 is funnel-shaped, very broad, spiral, each whorl being separated 

 from the next by a deep channel ; aperture broad. 



The detail not being well expressed in the figure accompanying 

 Mr. Tenison- Woods' memoir alluded to, a new figure is here given. 



Dimensions. — Height 9-5 mm. ; breadth 22 mm. 



Form, and Loc. — Eocene : Victoi'ia and South Australia. 



G. 4295. Two examples ; from Muddy Creek. 



Presented ly John Dennant, Esq. 



G. 5533. An example of the adult ; from Muddy Creek. 



Piirchased. 



G. 9135. Specimen in which the detail surrounding the 

 ■umbilicus is bolder than in the examples from Yictoria; from. 

 Eiver Murray dig's. Presented hij William Evans, Esq. 



G. 9481. Examples of the neanic and ephebic stages of growth ; 

 from Muddy Creek. Purchased. 



