GASTEEOrODA. 249 



Suh-gmera, Proto, Defr.^ P. cathedralis, PL IX., Fig. 3, 

 aperture truncated below. 



Mesalia, Grray, M. sulcata (var.), PI. IX., Fig, 2. Greenland 

 —South Africa. 



Fossily Eocene. Britain, France. 



CiECTJlMr, Fleming. 



Synonyms, Corniculina, Miinster. Broclius, Bronn. Odontl- 

 dium, Phil. 



Type, 0. trachea, PL IX., Fig. 5. Young species, Fig» 6. 



Shell at first discoidal, becoming decollated when adult; 

 tubular, cylindrical, arched; aperture round, entire; apex 

 closed by a mammillated septum. Operculum horny, many- 

 whorled. Lingual teeth, ; uncini, 2, the inner broad and 

 serrulated. 



Distribution, Britain, 11 species, 10 fathoms. Mediterranean. 



Fossil, 4 species. Eocene- — . Britain, Castelarquato. 



Yeemettts, Adanson. Worm-shell. 



Synonyms, Siphonium, Gray. Serpuloides, Sassi. 



Types, Y. lumbricalis, PL IX., Fig. 7. 



Shell tubular, attached ; sometimes regularly spiral when 

 young ; always irregular in its adult growth ; tube repeatedly 

 partitioned off ; aperture round ; operculum circular, concave 

 externally. 



Distribution, 31 species. Portugal, Mediterranean, Africa, 

 India. 



Fossil, 12 species. Neocomian — , Britain, France, &c. 



? S'ah-genus> Spiroglyphus, Daud. S. spirorbis Dillwyn species, 

 irregularly tubular ; attached to other shells, and half buried 

 in a furrow which it makes as it grows. Perhaps an annelide ? 



Fetaloconchus, sculpturatus, Lea, 1843. 



'Miocene, United States, St. Domingo, South Europe. 



Shell with two internal ridges running spirally along the 

 columella, becoming obsolete near the apex and aperture. 



SlLIQUAHIA, Brug. 



Etymology, siliqua, a pod. 



Typo, S, anguina, PL IX., Fig. 8. 



Shell tubular ; spiral at first, irregular afterwards ; tube with 

 a continuous longitudinal slit. 



Distrihution, 8 species* Mediterranean, North Australia. 

 Found in sponges. 



Fossil, 10 species. Eocene — . France, &c. 



M 3 



