14 On the Family Proserpinacea. 



Family PROSERPINADJE. 



Muzzle short, annulated. Tentacles lateral, subulate, short, distant. 

 Eyes sessile on the outer side of the base of the tentacles ; sides simple, 

 without any membranaceous fringe or lateral beards. The lateral central 

 teeth large, irregular, lobed or dentated. Foot moderate, truncated in 

 front, acute and keeled above behind, with a concavity in the front part 

 for the base of the shell, lined with an extension of the mantle. Oper- 

 culum none. Shell spiral, depressed ; whorls close-pressed, more or less 

 covered with a polished coat ; aperture lunate, with a fold forming a 

 slight truncate canal at the columnar angle. Peristome simple, acute ; 

 throat and inner lip with spiral laminae ; axis covered with a callous 

 deposit ; the septa between the upper whorls absorbed."* 



In the Family under consideration there are two Genera, 

 which, with the species hitherto known, are thus characterized 

 by Pfeiffer (Mon. Auric. Yiv., pp. 168-171, 1856). 



I. CERES GRAY. 



T. helicinaeformis, carinata, superne rugosa, cpidermide tenui obducta, 

 basi callo nitido munita ; apertura in speciebus notis utrinque lamellifera ; 

 peristoma rectum, subincrassatum. 



1. C eolina (CaracoHa) Duclos. 



— apertura " lamellis 6 intrantibus coarctata, 2 parallelis parietalibus, 

 1 subtransversa columellari, 3 inaequalibus, extus pellucentibus in pariete 

 basali." 



Hah. — Province of Vera Cruz, Mexico. — (Salle.) 



2. C. §allcana Cuming. 



— apertura " lamellis 6 coarctata, parietalibus 2, columellari 1 sub- 

 torta, 3 in pariete basali, mediana maxima." 



Hab. — Province of Vera Cruz, Mexico. — (Salle.) 



* See " On the absorption of parts of the internal structure of their shells by 

 the animals of Stoastoma, Lucidella, Trochatella, Helicina, and Proserpina." 

 By T. Bland, Ann. Lye. N. Y., vi. p. 11 I 



