24 GUTTURNIUM. 



Several authors have separated the West Indian and exotic 

 specimens of this most common of Tritons, upon differences 

 which are purely assumptions — the variations in coloration, 

 length of canal etc. pervading specimens from either of the 

 localities. 



T. Mauritianus, Tapparone-Canefri. 



Said to resemble T. tuberosus^ but smaller, with differently 



shaped and ornamented mouth ; shorter canal ; smaller number 



of varices ; and light color. Length, 32 mill. 



Mauritius. 



Not figured. It is very doubtful whether the species is a valid 

 one; ver}' probably it is one of the numerous variations of 

 T. tuberosus. 



T. cRispus, Reeve. PI. 13, fig. 114. 



Whitish or yellowish ; lip and columella covered with white 

 enamel; aperture blush or yellowish within. Length, 'TS inch. 



Hab. unknown. 



Has the appearance of a short, stout, miniature tuberosas. 



T. QuoYi, Reeve. PI. 13, fig. 116. 



Varices four or five ; whorls closely decussated, and nodulous 

 at the crossings of the riblets. Orange-brown. 



Length, r25 inches. 



Australia. 



This is the T. viperinum of Kiener, not Lamark — the latter 

 being a distinct fossil form. T. eburneus^ Reeve is closely allied, 

 but may be distinguished by its shorter and more obtuse spire. 



T. EBURNEUS, Reeve. PI. 13, fig. 115. 



Closely decussated ; varices four ; white. Length, "75 inch. 

 Isle of Tieao, Philij>2iincs ; under stones at low water. 



T. VERRUCOSUS, Reeve. PL 13, fig. \\\. 



Varices four or five ; whorls decussated and roughly nodulous. 

 Orange-brown ; lower portion of body whorl sometimes articu- 

 lated with darker brown ; aperture white within. 



Length, -85 inch. 



Australia ; Jamaica, (one specimen, R. Swift). 



