MONOGRAPH OF THE GENUS 

 PSEUDOLIVA, Swains. 



Gastridea, Sowb. Pseudodactylus, Hermann. 



Char. Gen. Testa spiralis, epidermide induta, subovalis, infra 

 sulco ad teriniuum vix dentifero incisa; apertura ovali, postice 

 canalifera, antice emarginata ; labio interno plerumque incrassato, 

 operculum corneum, nucleo laterali. 



The following species present a pretty natural group of Buc- 

 cinoid shells, which have a groove encircling the lower part of the 

 whorls, and generally terminating at the edge of the outer lip in 

 a sort of obtuse tooth. A canal is formed at the upper angle of 

 the aperture by the swelling of the outer lip, and a kind of callus 

 on the columella, and the anterior part of the aperture is, in 

 nearly all the species, deeply notched. The columella! - lip is 

 thickened over the body-whorl. Operculum horny, with lateral 

 nucleus. 



1. pltjmbea (pi. ccxvi. f. 9, 10), Chem. (Monoceros) Gastridea 

 — ? Eburna plumbea, Sowb. — P. testa ovali, laevi, pallide fulva, 

 epidermide subviridi induta; spira brevi, sutura canaliculata ; aper- 

 tura magna, labio externo valide unidentato, ad basin profunde 

 einarginato; labio interno laevi, lato, postice calloso. — This well- 

 known smooth oval shell was placed by my late father in the genus 

 Eburna, with which it lias some affinity, but the groove at the 

 lower part of the last whorl will distinguish it, and the genus 

 Eburna is better without it. 



2. austealis (pi. ccxvi. f. 7, 8), Soiob. Con. III. — P. testa 

 ovali, pallida, fulvo-nebulosa, spiraliter leviter striata; spira pro- 

 ducta, ad suturam profunde canaliculata, ; anfractibus ad suturam 

 angulatim elevatis ; apertura ovali, antice vix emarginata. — From 



VOL. III. U 



