66 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



I have not recognized the section Solanderina, created by Dr. Dall 

 in 1902 for S. nolandri (Gray) with the biief detiintion that it is 

 "inflated, smooth, and sub-eqiulateral ", because the convexity of the 

 valves is really the only point of difference. S. scripta is just as 

 smooth, 8. tnmca/a and S. karachiensis just as equilateral, and yet 

 both are compressed. The internal characters of solandri are the 

 same as those of the type : the only other species which could be 

 classed with it is S. neglecta, Smith, but that is less inflated and is 

 more nearly allied to S. vaginalis, which I should refer to the section 

 Sunetti7ia. 



Suh-genus. 



Meroina, J. -Br., 1908. Type, Cytherea irigonula, Desh. 



Shell oval or sub-tiigonal, but posterior side the longer. Escutcheon 

 less deeply sunk, and borders less acute than in recent forms. Kight 

 posterior cardinal grooved. Anterior laterals short and distant from 

 cardinals. Ventral and lateral margins smooth. 



Genus Circe, Schumacher, 1817. 



This genus dates from Kocene times through the sub-genera Gouldia 

 and Circenifa, but no representative of the typical section has yet 

 been found earlier than the Oligocene. At the present day this group 

 of shells is widely distributed over the whole world, but the typical 

 section of Circe (s.s.) and the sub-genus Crista are only found in the 

 tropical parts of the Indo- Pacific region. 



Synonyms: PapMa, Q^^aw, 1815 (not Lamarck) ; Gafrariiim, Dall 

 after Bolten, 1902. 



Shell oval or sub-orbicular, witli concentric or radiate sculpture or 

 a combination of both. Lunule flat, long, and narrow ; the e-^cutcheon 

 when defined is very narrow. Hinge-plate deep and triangular, 

 with three straiglit, separate, and sligiitly divergent cardinal teeth in 

 each valve. Right posterior dorsal margin always grooved, but on 

 the left anterior side only the lunular margin is narrowly grooved. 

 Lower margins smooth or orenulated. Pallial line entire or slightly 

 siniiated. Pedal scar small, round, and separate from the adductor 

 (except in Gouldia). 



Circe, s.s. Type, Venus scripta, Linn. 



Shell compressed and flattened at the umbones, with dominant 

 concentric sculpture, but often divaricately ribbed on the dorsal 

 margins or umi)onal disk. Escutcheon very narrow, and ligament 

 deeply snnk. Valve-margins smooth. Left posterior tooth long, the 

 median bifid and rugose, the others entire. Pallial line entire. This 

 typical section includes plicatina, rivularis, imdatimt, and var., orhica, 

 tumefacta, nuinnndina, and lirata, Horn., but not sulcata, which belongs 

 to Gouldia. 



rannulina, Dall, 1902. Type, Circe corriigata, C!hem. 



Shell thick, sub-orbicular, much flattened on the umbonal area, 

 which is rugosely ribbed, the rest of the surface being concentrically 

 sulcated or striated. Teeth generally more divergent. Ventral 

 marg-ius crenulated. Pallial line entire. So far as I can ascertain 



