BY E. M. JOHNSTON, F.L.S. 



107 



Sub-Genus. Anapa. Gray. 

 Shell sub-trigonal, ventricose, truncate posteriorly ; lateral teeth 

 sub-equal, compressed, smooth; siphonal inflection 



obsolete. 



(lxxviii.) Family SEMELiDiE. 

 Genus Semble. (596-598.) 

 Shell rounded, sub-equilateral, beaks turned forward ; posterior 

 side slightly folded; hinge-teeth 2'2, laterals elongated, 

 distinct in the right valve ; external ligament short, 

 cartilage internal, long, oblique; pallial sinus deep, 

 rounded. Dist— -West Indies, Brazil, India, China, 

 , Australasia, Peru. 





(lxxix.) Family Tellinids. 

 Shell free, compressed, usually closed and equivalve ; cardinal 

 teeth, 2 at most, laterals 1 — T, sometimes obsolete ; 

 muscular impressions rounded, polished ; pallial sinus 

 very large ; ligament on shortest side of the shell ; 

 external structure obscurely prismatic-cellular ; prisms 

 fusiform, nearly parallel with surface, radiating from 

 the hinge in the outer layer, transverse in the inner. 



Genus Tdllina. (599-606.) 

 Shell slightly inequivalve, compressed, rounded in front, angular 

 and slightly folded posteriorly, umbones sub-central ; 

 teeth 2'2, laterals 1 — 1, most distinct in the right valve ; 

 pallial sinus very wide and deep ; ligament external, 

 prominent. Disi. — In all seas, especially the Indian 

 Ocean. Most abundant and highly coloured in the 

 Tropics. Low water — coral zone, fifty fathoms. 

 Wellington Channel, Kara Sea, Behring's Straits, 

 Baltic, Black Sea. 



Genus Gael (607-609.) 

 Shell transverse, oval-oblong, flat, equivalve, sub-equilateral, 

 concentrically plicate, a little gaping on each side and 

 covered by a thin epidermis ; hinge narrow, with two 

 small cardinal teeth, sometimes bifid, in each valve ; 

 beaks small ; ligament long and prominent ; margins 

 simple ; muscular impressions rather large, equally 

 distant from the hinge, the anterior oblong, the 

 posterior rounded ; pallial impression distant from the 

 margin, with a narrow, profound sinus. Dist. — 

 Norway, Britain, India, New Zealand, Pacific ; littoral 

 — coralline zone, 100 fathoms. G. Gari is eaten in 

 India. 



