4i^ Zoological Societij. 



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. 



Whorls, each of them composed of two pieces ; apertm-e longitu- 

 dinal, toothed on both sides. 



Pythia scarabcBci, Linn. sp. 



This name is preferable to that of Fischer, Polydonta, 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 seripta (Chemn. f. 261-265) ^ Cuneus, Muhlf. 1811 = 

 Mero'e, 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. 



Tivela vulgaris (Chemn. f. 362). — T. tripla (Femes), lAxm.^Tri- 

 ffona, Muhlf. 1811. 



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



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

 ones ; anterior and posterior slope nearly equal. 



Musculium 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, I. 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 (Serjnda), 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, Asperyillum, are of younger date, and will give 

 way to Verpa, Bolt., defined bj' Link. 



Descriptions of Forty-three New Species of Cyclosto- 



macea, from the Collection of Hugh Cuming, Esq. 



By Dr. L. Pfeiffer. 



1. Cyclostoma Himalayanum, Pfr. C. testd umbilicatd, glo- 

 -',Wyboso-turbinatd,soliduld, costis spiralibus oblusis, 10-12, lineisque 



