559 



Head quadrilateral, without posterior auricles ; eyes sessile on 

 the middle of the upper surface of the head. Mantle included 

 within the shell, ending posteriorly in a thickened lobe. Foot 

 with the sides free, not connected to the head, enlarged in the 

 form of wings, which unite behind, and cover a portion of the 

 shell. 



The side-edges of the foot being free and unconnected with 

 the head, the form of the cephalic buckler, and the cup-shaped 

 lamina arising from the apex, and ending on the columellar 

 border of a depressed open shell, will distinguish this genus from 

 the other groups of the family Bullidce. All the species already 

 known are amphibious in their habits. 



Shell oval, depressed; aperture with a slight canal above; 

 inner lip with a cup-shaped appendage, spiral within. 



Genus 14. Cryptophthalmus, Ehrenberg. (Animal, pi. cxix. 

 f. 10. Shells, Bulla, sp. 129-131. pi. cxxi. f. 56-58.) 



Corpus semicylindricum, forma Aplysise tentaculis destitutse. 

 Caput depressum, carnosum, marginibus liberis; oculi minimi, 

 sub capitis margine, laterales. Pallium concham basi tantum 

 obtegit, maxima pars concha libera parum spirali obtegitur. 

 Pes alls duabus lateralibus, reflexis, in dorso complicatis, totum 

 corpus involventibus, et postremo corporis fine aperturam bran- 

 chialem formantibus. 



Testa fragilis, cornea, vix involuta, columella spiraque desti- 

 tuta ; apertura ampla. 



Body semicylindrical, in form of an Aplysia without tentacles. 

 Head depressed, fleshy, the margins free ; eyes small, lateral, 

 under the margin of the head. Mantle covering only the base 

 of the shell. Foot with two lateral wings reflected and folded on 

 the back, involving the whole body, and forming a brancliial 

 aperture at the liind part of the body. 



Shell fragile, horny, scarcely involute, destitute of columella 

 and spire ; aperture wide. 



Genus 15. Phanerophthalmus, Adams. (Animal, pi. cxix. 

 f. 11. Shell, sp. 132. pi. cxxv. f. 157, 158.) 



Corpus elongatum, rotundatum. Caput in medio sulcatum, 

 lobis rotundatis ad latera instructum, appendicibus posteriori- 

 bus brevissimis; oculi parvi, nigri, distantes, superficie capitis 

 positi. Pes lateribus super dorsum circumflexis. 



Testa interna ovalis, tota aperta, nee convoluta, margine dextro 

 prolongato, contorto, acuto. 



