GASTEEOPODA. 133 



Animal with, a long retractile proboscis ; tentacles close together, slender, 

 inflated at the tips ; eyes immersed at the bases of the tentacles ; operc. lobe 

 ample, misymmetrical ; foot truncated in fi'ont. Ranges to 80 fathoms water. 

 3 Brit. sp. Norway. 



Fossil. ? sp., Miocene — , Brit. (Crag). 



C^cuM, Fleming. 



Syn., comiculina, Miinster. Brochus, Bronn. Odontidium, Phil. 



Ti/pe, C. trachea, PI. IX, fig. 5. Young sp., fig. 6. 



Shell at fii'st discoidal, becoming decollated when adult ; tubular, cylindri- 

 cal, arched ; apertm^e round, entire ; apes closed by a mammiUated septum. 

 Operc. horny, many-whiiied. Lingual teeth, ; uncini, 2, the inner broad 

 and serrulated. 



Distr., Brit., 2 sp., 10 fathoms. Medit. 



Fossil, 4< sp. Eocene — . Brit., Castelarquato. 



Vermetijs, Adanson. Worm-sheU. 



Si/n., siphonium, Gray. Serpuloides, Sassi. 



Types, V. limabricalis, PL IX., fig. 7. 



Shell tubular, attached ; sometimes regularly spiral when young ; always 

 irregular in its adult growi:li ; tube repeatedly partitioned off ; aperture round ; 

 operc. circular, concave externally. 



Distr., Portugal, Medit., Africa, India. 



Fossil, 12 sp. Neocomian — . Brit, Trance, &c, 



F Sub-genus. Spirogli/phiis, Daud. S. spirorbis DiUw. sp., irregularly 

 tubular ; attached to other shells, and half bmied in a furrow which it makes 

 as it grows. Perhaps an ann elide ? 



SiLIQUARIA, Brug. 

 Etym., siliqua, a pod. 

 Type, S. anguina, PI. IX., fig. 8. 



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

 longitudinal slit. 



Distr., 7 sp. Medit., N. Australia. Found in sponges. 

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



ScALARiA, Lam. Wentle-trap. 



Etym., scalaris, like a ladder. Type, S. pretiosa, PI. IX., fig. 9 (= T. 

 scalaris, L.) 



Shell, mostly pure w^hite and lustrous ; tui-reted ; many-whirled ; whirls 

 round, sometimes separate, ornamented with numerous transverse ribs ; aper- 

 ture round ; peristome continuous. Operc. horny, few- whirled. 



Animal wiih. a retractile proboscis -like mouth ; tentacles close together, 

 long and pointed, with the eyes near their outer bases ; mantle-margin simple, 



