94 MARINE SHELLS OF SOUTH AFRICA. 
Antero-post 59, umbono-marg. 42, crass. 24 millim. 
Hab. Natal. 
This species may be readily distinguished from its 
congeners by its transversely oblong form. 
CyTHEREA (TIVELA) ALUCINANS, Sowerby, n. sp. (plate 7, 
figs. 5,6.) Testa subtrigona, leviter inazequilateralis, crassa, 
levis, nitens, pallida, lineis fuscis angulatim undulatis parum 
picta, epidermide tenui cornea induta; umbones acutiusculi, 
prominentes, paulo ante medium locati; margo dorsalis 
utringue declivis, anticus rectiusculus, posticus leviter 
arcuatus, ventralis arcuatus; area postica planulata, antica 
levissime concavo depressa; pagina interna alba, postice 
linea violacea picta; impressiones musculares parviusculi, 
sinu pallii lato paulo producto. 
Antero-post 63, umbono-marg. 55 millim. 
Hab. Natal. 
A worn valve of this species was mistaken by me for 
Meretrix zonavia (Journal of Conchology, vol. 7, p. 14.) I 
have since seen fine fresh specimens, and find it to bea T7vela. 
CytHEerea (TiveLa) potita, Sowerby, Thes. Conch., 
vol. ii., p. 618, pl. 127, fig. 14.—Natal. C. dolabella, Sowerby, 
is only a form of this species. 
CyTHEREA (Caryatis) ManitL&, Sowerby, Thes. Conch., 
vol. ii., p. 634, pl. 136, figs. 180, 181.—Natal. 
Circe (Crista) pivaricata, Chemnitz, Sow., Thes. Conch., 
vol. ii., p. 250, pl. 137, figs. 8, g.—Natal. 
LioconcuHa picta, Lamarck, Sow., Thes. Conch. 
(Cytherea), vol. il, p. 642, pl. 134, f. 149.—Durban. 
SUNETTA CONTEMPTA, Swuth, Proc. Zool. Soc., 1891, 
p- 422.—Merie menstrualis, Reeve (non. Menke) Conch. Icon., 
vol. xiv., fig. 9.—Natal. 
Tapes sutcaria, Lamarck, Sow., Thes. Conch., vol. i1., 
p. 685, pl. 146, f. 30-32.—Durban. 
Venus (CuHione) ListEr1, Gray, Sow., Thes. Conch., 
vol. ii., p. 705, pl. 152, f. 7-9.—Durban. 
Venus (CHIonE) ARaKana, Nevill (Cryptogrvamma), Journ. 
Asiatic Soc., Bengal, vol. xxxix., part 2, p. 10, pl. 1, f. 16.— 
Port Elizabeth and Durban. 
Venus (ANAITIS) LATILIRATA, Sowerby, n. sp. (pl. vi. fig. 
24). Testa triangularis, crassa, liris concentricis latis 
