Mr. T. D. A. Cockerell's Xotes on Slugs. 103 



very excellent account of the anatomy of Elisa see Simroth, 

 Jahrb. 1883, Taf. ix. and pp. 289-312. 



Mariaella, Gray. 



Gray's type of Mariaella is in the British Museum labelled 

 ^^ Clypeicella Dussumieriij Val., Mahe." 



It is 25^ millim. long; ochreous, mantle and body slightly 

 spotted with blackish ; sole unicolorous, margins striate ; 

 mucus-pore strongly marked. 



The shell is white, with a membranous or horny margin. 



Several names have been given to Mariaella. Clypeicella, 

 written sometimes Clypidiella, is the original MS. name of 

 Valenciennes, passed over by Gray because there was a 

 Clypidella, Swains. 



Tenneniia, applied to the Ceylon form, appears sometimes 

 as a subgenus ; but it has no standing, being Mariaella pure 

 and simple. It is possible though that the Philippine M. 

 {Tennentia) philipinnensis, Semper, may be separable sub- 

 generically or otherwise. 



" Mariaella " j)lanulatn^ Pfr., and " 3/." papillata, Pfr,, 

 contained in the British Museum, are Vitrinoid shells widely 

 separated from Mariaella. Viqueneselia was applied to 

 Mariaella in 1859 by Fischer; but the true Viqueneselia^ 

 Desh., is a fossil and not even a mollusk. 



Vega^ Westerlund, founded on V. Nordenskioldi^ West., 

 from Ceylon, was described and figured in 18S5. It appears 

 to be a Mariaella. 



Finally, Dekhania, Godwin-Austen, described as a sub- 

 genus of Girasia^ is also simply Mariaella. 



Mariaella Thwaitesi^ Humbert. 



Length (in alcohol) 2H millim.; mantle, long 11 millim. ; 

 respiratory orifice 5 millim. from anterior border; sole 4 

 millim. broad. Mantle elongate- ovate, subtruncate before 

 and behind ; apertures very miimte or none. Colour of 

 mantle grey-ochre, yellowish at edges ; pale ridges run from 

 the posterior part, one to the respiratory orifice and one sub- 

 dorsally on the left side, fading anteriorly. Body greyish 

 ochre, slightly streaked in lateral grooves with blackish pos- 

 terior to mantle. Keel strong. Caudal pore well marked. 

 Edge of foot with concolorous transverse grooves. Sole 

 brownish ochre, unicolorous, striate at sides. 



The above-described example appears to have no opening 



