195 



Shell elongate ; protoconch very small, composed of two smooth, 

 shining turns, somewhat inflated, elevated and subceutial at the 

 couimencement ; shell in the brephic stage strongly, longitudinally 

 ribbed, interstitial ornament obsolete ; the latter, however, becomes 

 accentuated with growth, consisting of closely-set spiral linea- 

 tious, which, in conjunction with the flexuous and closely-set 

 longitudinal ribs, produce subcancellation, and granulation in the 

 adult; varices broad, rounded, crossed by the spiral lineations ; 

 aperture small, narrow, deeply channelled in front; outer margin 

 typically varicose, dentate, Urate within, posterior sinus absent ; 

 inner margin plated, smooth; columella slightly granulose, twisted; 

 canal short. 



Dimensions. — Length 16 mm. ; breadth 6 mm. ; length of aperture 

 and canal 7 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



G. 4165. Two specimens. Presented hy John Deniiant, Esq. 



G. 9391. Examples of the adult. Purchased. 



Genus APOLLO, Montfort {em.). 

 [Conch. Svst. t. u. 1810, p. 571.] 



The principal distinctive features of this genus are the con- 

 tinuous or subcontinuous varices by which it may be distinguished 

 from Lotorium. Its general contour is that of Ranella, from 

 which it differs, amongst other things, by the absence of a posterior 

 groove, canal, or sinus. 



Apollo is sometimes regarded' as a section of Argohuccinum, 

 Klein ; but that cannot be admitted, the latter being the work 

 of a pre-Linnean author and not brought on until Apollo had 

 already been suggested. If Argoluccinum is not to be regarded 

 as synonymous with Apollo, the differences are certainly not of 

 generic value, and it is here suggested that Apollo should be 

 regarded as the genus, and Argoluccinum, Gijrina, Schumacher, 

 Aspella, Morch, etc., as subgenera. 



Type. — Murex gyrinus, Linnaeus. 



' E.g. Fischer, Mauuel de Concbyl. 1884, p. 6.5-5. 



