58 SYSTEMATIC ARRANGEMENT 



Foot broad, depressed, truncated in front, sharp, angulated or nicked, 

 vibrating, narrow in tbe middle, tongue-shaped behind. Opercu- 

 ligerous lobe moderate, with a conical appendage at each side. The 

 mantle with a thin, tongue-shaped, channeled process on the right. 

 — Loven, Moll. Scand. 18, 1846. 



As the apex of the young shell of Odostomia in the egg is hetero- 

 stroph, it might be supposed that the adult would be liable to be 

 twisted in this manner, but this is not the case. Mr. Jeffrey has 

 justly remarked {Ann. fy Mag. Nat. Hist. ii. 1848, 333) : "Although 

 I have examined many hundred specimens of Odostomia: from almost 

 every part of the kingdom, I have only once met with a reversed 

 shell, and which I referred to the Turbo Icevis of Walker (f. 35) ; 

 but the specimen was unfortunately broken, after having been many 

 years in my cabinet. I considered it to be a monstrosity of Odo- 

 stomia pallida." 



b. Shell free ; pillar-lip smooth. 



4. Chemnitzia. 



Head bToad, bilobed in front ; proboscis elongate ; tentacles flat- 

 tened, tapering, triangular or ear-shaped ; eyes on the inner side of 

 their base ; foot short, triangular, lanceolate, with a distinct fold or 

 mentum in front. Shell turrited ; whorls many, striated and cross- 

 ribbed, opake ; apex sinistral, heterostroph ; aperture oblong or sub- 

 quadrate ; lip thin ; pillar-lip straight. Operculum horny, subspiral. 



1 . C. rufa, Forbes $r Hanley, B. M. t. F.F. f. 4. 



2. C. scalaris, Forbes fy Hanley, B. M. t. F.F. f. 5. Turbonilla s., 



Adams, Gen. Moll. t. 24. f. b. 



3. C. rufescens, Forbes fy Hanley, B. M. t. F.F. f. 6. 



4. C. MacAndrei, Forbes fy Hanley, B. M. t. F.F. f. 7. Eulimella 



Scillse, Adams, Gen. Moll. t. 24. f. 8. 



Animal of Chemnitzia nivea white ; head short ; tentacles tri- 

 angular, very broad, with the eyes at nearly the middle of their 

 bases ; foot elongate, with an acuminated indentation at the anterior 

 extremity. — Stimpson, Test. N. Eng. 40. 



Chemnitzia MacAndrei and C. acicula have been referred to Eu- 

 lima. Professor E. Forbes has more recently proposed for them 

 the genus Eulimella, but we prefer considering them to belong to 

 Chemnitzia, from which they only differ in the more polished surface 

 of their shell. The apical nucleus and the form of the aperture in- 

 dicate their place in this genus, independently of the animal, which, 

 according to our observations, is essentially the same in each. — Alder 

 Cat. Moll. N. 50. 



Chemnitzia. "Animal illi Eulimarum simillimum, sed probosei- 

 diferum ; sic describitur : Animal corpore admodum spirali, pallio sim- 

 plice, ecanaliculato ; pede antice abrupte truncate, postice attenuato, 

 exappendiculato, operculifero ; tentacula duo triangularia (triquetra), 

 s. prismatica, basi coalita, oculis sessilibus, superne ad basim inter- 

 nam (?) positis, approximatis. Buccec labiales coalitse, infra tenta- 



