STEXOTIIYRA, 



79 



Alt. ('f2'\ diiuii. .'^5 nun. 



Aperture: alt. 2-5, d'uvv.. l/To mm. 



J/ah. Kyoukpong, lliver Irawady. 



Sul.faniily STEXOTHYRTX.E. 



Foot simple; radula of Bithynht: operculum calcarcou'!, spiral. 

 Distrihution. S. and E. Asia; X. Australia (Recent): Eocene 

 of Europe (Fossil). 



Genus STENOTHYRA. 



Sfoiotln/rn, Benson, A. M. X. TT. ser. 2, xvii, TWO, p. 496. 

 Nematiira, lienson, .1. \. S. JJ. v, 18o(>, p. 7sl (not of Fi.-iclicr, 

 genus Orthopt., 181 o). 



Type, S. dcJke, Benson ; Gaugetic Delta. 



Ramje. S. & E. Asia ; X.E. Australia. 



Oriijiiml description. — Animal. Caput tentaculis duobus setaceis 

 oculis postice prope bases tentaculorum sessilibu.s ; proboscide 

 elongata, cylindracea, extensili. Pes ovato-oblongiis, medio ventri- 

 cosus, postice angustatus, acuminatus, processu brevi tiliformi 

 subito desinens ; antice expansus, medio profunde einarginatus ; 

 ala utroque latere porrecta late angustata, acuminata. 



Testa ovata, ventricosa, a latere compressa, ultimo anfractu 

 insuper aperturam angulato, deflexo. Apertura Integra coustricta, 

 orbiculari, supra A^ix angulata ; peritremate acuto leviter intus 

 incrassato. Operculo teuui in spiram plenam convoluto. 



l'>8. Stenothyra deltse (Benson). 



Stenothyra delt<e (Benson), J. A. S. V,. v. IS-'Ui, p. 781 (as 

 jVevwfitni) ; A. M. X. II. ser. 2, xvii, 18r)tj, p. 499; Sowerby, 

 INIag-. Xat. Hist, (("aarleswortli's series) i, 1837 (as Nemaiura) ; 

 II. & T., C. I. pi. 37, tig. -2. 



Oriqinal description: — Testa ovato-conica, a l;itei-ibus tumida, 

 lutescente. ultimo anfractu ventricoso, niajori omnibus oblique 

 minute striatis; spira brevi, apice acuto; umbilico evauescente. 



A li . <) mm. 



lUd). Ganges Delta. 



Subvar. minor, Nevill, Hand List, pt. L', p. A[\. 



Alt. 4, diam. 2-5 mm. 



Ilah. Port Canning [Nevill, ]Vood-Miison). 



Subvar. minima, Xevill, tom. cit. 



Alt. 2'75, diau). 1"75 mm. 



Hah. Port Canning {Nevill, Wood-Mason). 



