60 SYSTEMATIC ARRANGEMENT 



In Eulima polita the animal is white, except the tentacles and 

 margin of the mentum, which are deep golden-yellow. The liver, as 

 seen through the shell, is green in E. distorta, and purplish in 

 E. polita.— Alder, Cat. Moll. N. 47. 



These are the prevailing colours of the genus, but the disposition 

 of them is different in different species, and appears to be sufficiently 

 permanent to be taken as a specific character. 



The animal of Eulima distorta has two long subulate tentacles, 

 with very large eyes at their posterior base. The foot is slender, 

 much produced in front, and has a bilobed flap (mentum of Loven) 

 on its upper surface. The body is yellow, beautifully variegated 

 with carmine, which forms an irregular band on each side ; the ten- 

 tacles and foot white. 



The animal of Eulima oleacea is white, hyaline. Tentacles almost 

 joining each other at their bases, where on the exterior sides are the 

 eyes, which may be seen through the shell when, as is usually the 

 case, the head does not project beyond it. Foot short, broad, slightly 

 produced at the anterior angle, the lobe above projecting rather 

 beyond it. — Stimpson, Shells N. Eng. 40. 



The proboscis of Eulima polita has a very long unarmed lingual 

 riband, without the least appearance of spinous processes. — Clark, 

 Moll. 449. 



The retractile proboscis of Eulima is very similar to that of Chem- 

 nitzia ; it consists of two retractile tubes, an inner and an outer one, 

 as in Murex undatus. Though the long flat tongue appears quite 

 smooth, there is nevertheless, in the inner cylinder, the appearance 

 of a shagreened, roughened portion, which may be tantamount to the 

 denticular portion of the inner tube of Murex undatus. — Clark, 

 Moll. 449. 



The verge of Eulima polita springs under the right tentaculum ; 

 it is rather long, flat and falcate at the end ; branchial plume single. 

 The Eulimce are extremely free and vivacious; they delight in swim- 

 ming, and march with celerity. — Clark, Moll. 450. 



What has been called the mentum in Eulima is an integral part of 

 the disk of the foot. Loven does not mention one. — Clark, 449. 



6. Nisso. 



The shell differs from Eulima in the axis being umbilicated. 

 Operculum half-ovate. — Adams, Gen. Moll. t. 25. f. 2. 



1. N. terebellum. 



7. Leiostraca. 



Shell subulate ; whorls many, flat, polished ; outer lip simple, 

 acute ; pillar lip smooth, axis imperforated. Mouth ovate, narrow. 

 Operculum horny. 



Tentacles two, long, subulate, close together at their base, with the 

 eves immediately behind them. Foot extended in front, with a bi- 



