6 NERITIDJE. 



minima; colore luteo-flavescente rubro reticulata; intus flave- 

 scente-pallida ; aliquando caerulescente ; non raro fasciis duobus 

 eineta in apertura facilius visis. Epidermide plerumque nigro 

 colore, extraneo fucato ; semipolita, operculo palliae aurantiaco, 

 margine anteriore rubro. 



Alt. 12-5, diam. 12%5 mm. (from fig. 266 in Thes. Conch.). 



Nab. Burma, near Amrapoora. 



11. Theodoxis reticularis (Sowerby). 



Theodoxis reticularis (Sowerby) (for Neritina reticulata, Bens, not 

 Sow. in P. Z. S.), Conch. lllust, Ner. fig. 44 ; Thes. Conch, ii. 

 p. 536, figs. 264, 265 ; H. & T., C. I. pi. 157, figs, 5, 6. 



Neritina humeralis, Th. (name only). 



Original description : Testa snbconica, Isevi, pallide fulva, 

 rufescente, epidermide tenui, subviridi induta, lineis angulatis 

 transverse reticulata; spira plerumque exsertiuscuia, apice sub- 

 complanato, anfractu ultimo, supra suturam angulatira elevato, 

 infra medium ventricoso ; apertura subcontracts, labio externo 

 superne declivo, infra medium producto ; columella tumida, margine 

 sublaevigato. 



Alt. 15, diam. maj. 15 mm. (from fig. 264 in Thes. Conch.). 



Hob. Calcutta. 



12. Theodoxis obtusa ( Benson). 



Neritina obtusa, Benson, in Sow. Conch. lllust., Ner. fig. 43 ; Thes. 



Conch, ii, p. 517, pi. Ill, figs. 72, 73. 

 Neritina spiralis. Reeve, Conch. Icon., Ner. fiaf. 99 (from type) ; 



H. & T., C. I. pi. 157, fig. 7. 



Original description : Testa transverse ovali, leviter striata, 

 epidermide subviridi induta ; spira depressa, anfractibus duobus ; 

 apertura magna, subcinerea ; labio externo interne crassiusculo ; 

 labio interno complanato, recedente, margine sinistro oblique 

 acuto, margine dextro in medio subarcuato, subcrenulato. Operculo 

 cinereo. 



Alt. 10, diam. maj. 12-5 mm. (from fig. 72 in Thes. Conch.). 



Hub. Banks of the Ganges, Calcutta. 



* Genus SEPTARIA. 



Septaria, Ferussac, Essai M^th. Conch., Paris, 1807, p. 61. 

 Navicella, Lamarck, 1809. 

 Cimber, de Montfbrt, 1810. 



Sandalium, pars, Schumacher, 1817. 

 Catillus, Humphrey, 1797, fide Swainson, 



1840. 



TYPE, Patella porcellana, Linn. : Islands of Bourbon, Eodriguez, 

 Mauritius, and Madagascar. 



Range. S. Asia ; N. Australia ; Malaysia ; Tropical Islands of 

 Indian and Pacific Oceans. 



