GASTEKOrOBA. 249 



Suh-gcnc^'a. Proto^ Defr., P. cathedi-alis, PI. IX., Fig. 3, 

 aperture truncated below. 



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

 ' — South Africa. 



Fossil, Eocene. Britain, France. 



CiECUM, Fleming. 



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

 dium, Phil. 



Type, C. trachea, PL IX., Fig. 5. Toung 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. 



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



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



Vermetus, Adanson. Worm-shell. 



Synonyms, Siphonium, Gray. Serpuloides, Sassi. 



Ty2)€s, Y. lumbricalis, PI. 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. 



? Sub-genus. Spiroglyphus, Daud. S. spirorbis DillwjTi species, 

 irregularly tubular ; attached to other shells, and half buried 

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



Fetalocovchus, sculpturatus. Lea, 1843. 



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



Shell with two internal ridges running spirally along tho 

 columella, becoming obsolete near the apex and aperture. 



SiLIQUARIA, Brug. 



Etymology, siliqua, a pod. 



Tyj^o, S, anguina, PI. IX., Fig. 8. 



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

 a continuous longitudinal slit. 



Distribution, 8 species. Mediterranean, North Australia, 

 Found in sponges. 



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

 M 3 



