G02 



posterior urn, ct marginc pallii linca cyanco-viridi ornatis ; testa 

 ininima, fragili, tota aperta, alba, marginc 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., wliich appear to me links connecting the BuUidce with the Apli/siada, and 

 which may be thus characterized : — 



LoBiGEB, Krolm (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 papillse. 



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

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

 Nat. 3me Serie, j)l. xi. f. 1, 2. 



LoPHOCERCUS, Krohn (Tab. cxix. Fig. 19). 



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

 with the natatory appendages undivided, refiexed, and partly covering the shcU in 

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

 a long pointed tail. 



SheU involute, thin, ovate, covered with an epidermis ; the outer Up separated 

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

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



SPECIES UNIDENTIEIED. 



B. (Utriculus) globosus, Loven, Ind. Moll. Scandinavise, p. 11. 



B. (Scaphander) librarius, Loven, Ind. MoU. Scandinavia?, p. 10. 



B. (Cyliclma) nitidula, Loven, Ind. Moll. Scandinaviae, p. 10. 



B. (Cyliclma) pulvisulcus, Ehrenberg, Symb. Pliys. 



B. (Cyliclma) BaciUus, Ehrenherg, Symb. Phys. 



B. (Cyliclma) diapliana, Ar_. et Magg., Catalog, rag. p. 40. Phil., 



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

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

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



