SEDENTARIA. 179 



Plate XIX. fig. 25. Brown, regularly furrowed transversely. 

 Fourth of an inch long. Inhabits the British seas. 



Genus 12— CORNUOIDES._^roM;». 



Generic Character, — Animal unknown. Shell cylindrical, 

 tapering, the smaller end spiral. 



Cornuoides major. — The Greater Cornuoides. Plate 

 XIX. fig. 23. White, smooth, and semitransparent. Length 

 scarcely a line. Inhabits the sea at Sandwich. 



Genus 13.— CLYMENE.— £a»iercA, 



Generic Character Body tubicolar, slender, and cylin- 

 drical, with a series of setiferous papillae on either side ; an- 

 terior extremity retuse, oblique, having a semicircular mar- 

 gin, protruding beyond the mouth ; destitute of tentacula ; 

 posterior extremity dilated, orbicularly expanded, in a funnel 

 shape ; the margin with equally slit dentations. Tube slen- 

 der, open at both extremities, and incrusted externally with 

 grains of sand and fragments of shells, 



TRIBE IV. DORSALIA. 



With branchiae placed on the back, or disposed longitu- 

 dinally along the body. 



Genus 14.— SILIQUARIA Lamarck. 



Generic Character. — Body tubicolar, but not well known. 

 Shell tubular, irregularly contorted, posteriorly attenuated, 

 sometimes spiral at the base, and open at the exterior end, 

 with a longitudinal, subarticulated slit, which continues its 

 whole length. 



Siliquaria anguina The Snake-like Siliquaria. 



Plate XIX. fig. 24. Shell taper, undulating, with a longi- 

 tudinal fissure ; spiral at the extremity. Inhabits the Indian 

 seas. 



