1920.] 



E. Ghosh : Anatomy of the Solenidae. 



73 



Synopsis of the Genera. 



Body flattened laterally with a narrow \entral surface ; 



no cruciform muscle 

 a i. Gills plicate. 



a^. Siphons fused to a single piece. 

 a 3. No fourth aperture. 



a *. Body and gills narrow and elongated, 

 a 6. Anterior adductor muscle nar- 

 row and elongated 

 b 5. Anterior adductor muscle 

 rounded 

 b*. Body and gills short and deep 

 b3. A fourth aperture 

 b 2. Siphons separate. 



a 3. A fourth aperture continuous with pedal 

 aperture, 

 a*. Body elongated; two /o;z^ siphonal 



tubes 

 b *. Body comparatively short ; two short 

 siphonal tubes 

 b ^. No fourth aperture ; siphonal tubes short, 

 a*. Gills short and deep; anterior lip 

 immediately behind the anterior 

 adductor ... 

 b *. Gills long and narrow ; anterior lip 

 separated from anterior adductor 

 muscles by an interval 

 b 1. Gills non-plicate 



Body widened laterally, with a wide ventral surface. 

 a 1. Gills non-plicate; no cruciform muscle 



b '. Gills plicate ; a cruciform muscle 



a'^. Ventral margins of the mantle lobes fused to 

 form a surface ; cruciform muscle cross- 

 shaped. 

 a 3. Ventral surface long ; a long and wide 

 common proximal portion of the 

 siphon ; no tentacular fringe along the 

 mantle margin... 

 bs. Ventral surface short ; a short common 

 proximal portion of the siphon ; a ten- 

 tacular fringe along the mantle margin 

 b 2. Ventral margins of the mantle lobes not fused, 

 except at the posterior end. 

 a 3. A short common proximal portion of 

 the siphon ; anterior adductor muscle 

 simple ; cruciform muscle cross-shaped 

 b 3. No common proximal portion of the 

 siphon, 

 a*. Anterior adductor muscle simple; 



cruciform muscle band-like 

 b*. Anterior adductor muscle divided 

 into two portions ; cruciform muscle 

 cross -shaped 



Subfam. Sole- 

 ninae. 



Solen. 



Solena. 



Neosolen. 



Ensis. 



Ceratisoleii, 

 Siibcultellus. 



Ctiltellus. 



Pharella. 

 Siliqua. 



Subfam Nova- 

 culininae 



{Novaciilina), 

 Subfam Sole- 



curtinae. 



Solecurttis. 

 Azor. 



Solecurtellus. 



Subtagelus. 

 Tagelus. 



IvlTERATURE. 



Adams^ H., and Adams, A. A., Genera of Recent Mol- 

 lusca (1858), Vol. II, pp. 341-347; Plates (Vol. Ill) 



xcu-xcin. 



