002 



posteriorurn, ct margine pallii line;! cyaneo-viridi ornatis ; testa, 

 minima-, fragili, tota aperta, alba, margine dextro piano, alato, pos- 

 tice acuto ; long. 1 poll. 

 Mauritius. 



Note. — Since writing the above Monograph, I have examined the figures and de- 

 scriptions of two remarkable genera described by M. Krohn, in the Ann. des Sci. 

 Nat., which appear to me links connecting the Bullidce with the Aplysiadce, and 

 which may be thus characterized : — 



Lobiger, Krohn (Tab. cxix. Fig. 18). 



Head with two auriform tentacles ; eyes sessile on each side of the head. Foot 

 with the natatory appendages in the form of dilated rounded lobes, two on each side. 

 Body produced posteriorly into a long pointed tail covered with papilla;. 



Shell covered with an epidermis, thin, transparent ; spire rudimentary, in the 

 form of a protuberance directed towards the left. L. Philippi, Ann. des Sciences 

 Nat. 3me Serie, pi. xi. f. 1, 2. 



Lophocercus, Krolm (Tab. cxix. Fig. 19). 



Head with two auriform tentacles ; eyes sessile on the sides of the head. Foot 

 with the natatory appendages undivided, retlexed, and partly covering the shell in 

 front, and united posteriorly. Body covered with papilla;, and produced behind into 

 a long pointed tail. 



Shell involute, thin, ovate, covered with an epidermis ; the outer lip separated 

 from the last whorl, its hind angle indexed, produced, and rounded. L. Sieboldii, 

 Krohn, Aim. des Sciences Nat. 3me Serie, Zoologie, torn. vii. pi. ii. fig. 5-8. A. A. 



SPECIES UNIDENTIFIED. 



B. (Utriculus) globosus, Loven, Intl. Moll. Scandinavia;, p. 11. 



B. (Scaphander) librarius, Loven, Ind. Moll. Scandinavia;, p. 10. 



B. (Cylichna) nitidula, Loven, Ind. Moll. Scandinavian, p. 10. 



B. (Cylichna) pulvisulcus, Ehrenberg, Symb. Phys. 



B. (Cylichna) Bacillus, Ehrenberg, Symb. Phys. 



B. (Cylichna) diaphana, At. et Mugg., Catalog, rag. p. 40. Phil., 



Enum. Moll. Sicil. vol. ii. p. 215. 

 B. (Cylichna) mica, Ehrenberg, Symb. Phys. 

 B. (Atys) albicita, Dufo, Ann. Sc. Nat. t. 14. p. 203. 



