452 Zoological Society. 



or Rotella, Lamck., can hardly be controverted ; although his second 

 species belongs to another tribe. 



Pythia, Bolten, 1/98, Mus. (ed. 1819, p. 74); Link, 1807, 1, c. iii. 

 p. 139. 



Wliorls, each of them composed of two pieces ; aperture longitu- 

 dinal, toothed on both sides. 



Pythia scaraheea, Linn. sp. 



This name is preferable to that of Fischer, Pohjdcmta, which, 

 although contemporary, is badly made, and wants correction. 



ACEPHALA. 



SuNETTA, Link, 1807, I. c. iii. p. 148. 



Equivalve, in front rather obtuse, closed ; hinge with two cardinal 

 teeth, lateral ones indistinct ; anterior slope shorter than the furrow- 

 shaped posterior slope ; ligament external. 



Sunetta scripta (Chemn. f. 261-265) = Cuneus, Muhlf. 1811 = 

 Meroe, Schum. 1817. 



TivELA, Link, 1807, I. c. iii. p. 152. 



Equivalve, longitudinal, without epiderm, closed ; hinge with two 

 cardinal and one elongated lateral tooth ; anterior and posterior slopes 

 equally elongated ; ligament external. 



TiveJa vulgaris (Chemn. f. 362). — T. tripla (^Venus), Linn.= Tn- 

 go7ia, Muhlf. 1811. 



MuscuLiuM, Link, 1807, I.e. iii. p. 152. 



Equivalve, closed ; hinge with two small cardinal teeth, no lateral 

 ones; anterior and posterior slope nearly equal. 



Musculitim lacustre (Tellina), Linn. 



The genus established here, fourteen years afterwards was pub- 

 lished as Pisidium. 



Tentaculata. See ' Ind. Gen. Malacoz.' ii. 541. 



Verpa, Bolten, 1798, Mus. (ed. 1819, p. 49) ; Link, 1807, 1, c. iii. 

 p. 159. 



Shell tubular, partly straight, partly winding, at one extremity 

 open, at the other closed by a convex perforated blade. 



Verpa penis (Serpula), Linn. 



The oldest denomination of this genus that can be admitted ; Peni- 

 cillus (Da Costa, p.p.), Brug., being a term since the times of Ron- 

 delet consecrated to the Annulate class : all the other names. Aquaria, 

 Arytcena, Clepsydra, Aspergillum, are of younger date, and will give 

 way to Verpa, Bolt., defined by Link. 



Descriptions of Forty-three New Species of Cyclosto- 



macea, from the Collection of Hugh Cuming, Esa. 



By Dr. L. Pfeiffer. 



1. Cyclostoma Himalaya NUM, Pfr. C. testd umbilicatd, glo- 

 boso-turbinatd, soliduld, costis spiralibus obtusis, 10-12, lineisque 



