24 GUTTURNIUM. 



Several authors hare 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 diifereiitly 

 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; very probably it is one of the numerous variations of 

 T. tuber osus. 



T. OBISPUS, Reeve. PL 13, fig. 114. 



Whitish or yellowish ; lip and columella covered with white 

 enamel ; aperture blush or yellowish within. Length, "75 inch. 



Hab. unknown. 



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



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, 1*25 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 Ticao, Philippines ; under stones at low water. 



T. VERRTJCOSUS, Reeve. PI. 13, fig. 117. 



Yarices 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). 



