34 GASTEROPODA. MARSENIADS. 
1, Esmra Grirrirustana. Tab. VII. figs. 8-10. 
E. Corpore ovato-heemispheerico, syphone nigro marginato, 
Habitat in Danmonie Australis mari. 
Testa elongato-scaphiformis. 
Body ovate-hemispheric, the syphon edged with black. Shell 
elongate, boat-shaped. Length of the animal about half an 
inch ; of the shell about a quarter. 
Esmia Griffithsiana, the species serving as the type of this 
new and highly important genus, was discovered amongst the 
rejectamenta taken up by a trawl in Torbay, and was commu- 
nicated to me, along with a vast number of interesting sea 
animals found on that coast, by Mrs. Griffiths, after whom I 
have named it. 
FAMILY ITT. MARSENIADZ. 
Branchie sinistra testa tectee. Pallium testam omnino tegens, 
undique dilatatum, anticé emarginatum. Yentacula duo labia- 
lia compressa, externé ad basin dilatata, oculigera. Os tubula- 
tum, rotundum. Pes marginibus attenuatis, anticé transversim 
plicatus, posticé liber. Testa calcarea, spira subdepressa. 
Branchiz situated on the left side, covered by the shell. 
Mantle entirely covering the shell, much dilated on every side, 
notched anteriorly. Tentacula two, arising from the lips ; their 
external base dilated, and bearing eyes. Mouth tubular and 
round, Margins of the foot attenuated, transversely folded 
anteriorly, free behind. Shell calcareous, with the spire some- 
what depressed. 
Of this family we possess but one genus, which has been 
placed with the Bulle by British Zoologists, to whom alone it 
seems to have been known. 
Genus 14. Marsenia. 
Tentacula compresso-conica. Testa auriformis, patula. 
Tentacles compressed-conic. Shell ear-shaped, gaping, spire 
somewhat depressed. 
1. MARSENIA PRODUCTA. 
M. testa elongata, spira elevatiuscula. 
