ON MONODONTA QUADRASI, n.sp., BELONGING TO THE SUBGENUS 

 AUSTROCOCHLEA, FEOM THE PHILIPPINE ISLANDS. 



By G. B. SowEEBY, F.L.S., etc. 



Read 10 fh December, 1897. 



The subgenus Austrocochlea was founded by Fischer in 1885 to 

 include a small group of Australian species of Monodonta, having 

 M. constricta, Lam., for the type. These had previously been placed 

 with Trochocochlea, Klein (= Oscilinus, Phil.), a section now restricted 

 to the Mediterranean group, of which Monodonta turhinata, Born, 

 is the type. 



Pilsbry' admits only two species under Austrocochlea, viz., Monodonta 

 constricta, Lam., and M. zebra, Menke, the latter with numerous 

 synonyms relating to variations in colour and form. The group has 

 hitherto been regarded as exclusively Australian, since South Australia 

 and Tasmania furnish most, if not all, of the species. The new 

 species from the Philippines, found by Mr. Quadras, after whom 

 I have much pleasure in naming it, is manifestly distinct from the 

 Australian species, though there can, I think, be no doubt as to its 

 belonging to the same subgenus. 



Monodonta (Axjsteocochlea) Qttadrasi, n.sp. 



Testa conica, elatiuscula, crassa, imperforata, griseo-lutescens, rufo- 

 fusco strigata et minute maculata ; spira leviter convexa, ad apicem 

 acuta ; anfractus 5, angulati, tricarinati, suboblique striati, liris 

 numerosis angustis leviter granulosis rufo-fusco punctatis cingulati, 

 supra angulum concave declives ; sutura irregulariter impressa, vix 

 canaliculata ; basis convexa, leviter producta, liris 6 conspicue punc- 

 tatis instructa ; columella callosa, leviter obliqua, ad basim minute 

 tuberculata, extus subconcavo expansa ; apertura subquadrata, intus 

 argentea, valde 7-lirata ; peristoma acutum, maculatum. Alt. II, 

 maj. diam. 9 mm. 



Jlal. — Tablas Island, Philippines (Quadras). 



In appearance somewhat like a miniature M. zebra. The tubercles 

 at the base of the columella are rather more conspicuous than in 

 that species ; the numerous revolving lirse and the three keels are 

 granulose ; whilst the base is strongly ridged and brightly spotted. 



1 Man. Conch., ser. i, voL xi, p. 90. 



