sowerby: new marine Philippine mollusca. 211 



12. Cerithium oscitans, n.sp. PI. XXII, Fig. 12. 



Testa ovato-pyramiclata, tenuis, albida, fusco strigata; spira acute 

 pyramidalis ; anfractus 9, convexi, longitudinaliter striati, spiraliter 

 irregulariter et inconspicue lirati, supra medium obtuse angulati, 

 sutura profunda sejuncti ; anfractus ultimus spiram fere asquans, 

 inflatus ; apertura lata ; canalis brevissimus, sinistrorsum obliquus ; 

 labrum simplex, acutum, rotunde arcuatum ; columella leviter arcuata, 

 tenuiter callosa, lira crassiuscula callosa superne instructa, inferne 

 contorta, oblique sinistrorsum retracta. Long. 1 1 , diani. 5 mm. 



A ligbt shell, whitish, ornamented with longitudinal brown streaks, 

 having a pyramidal spire, inflated body- whorl, and wide mouth. 



13. Emarginula biangulata, n.sp. PL XXII, Fig. 13. 



Testa elongato-conica, subdepresse capuliformis, albida, antics 

 arcuata, subquadrata, obtuse biangulata, postice oblique truncata, 

 rotundata, leviter expansa, undique costis radiantibus numerosis elatis 

 nodatis crassiusculis alternatim angustioribus, et liris numerosis 

 angustis transversis decussata, interstitiis foveolatis, dorso valde 

 arcuato, apice acuto, incurvo, post medium sito, margine crenulato, 

 fissura elongata. Long. 11, lat. 8, alt. 5 mm. 



A beautifully latticed shell, of which the principal ribs are stouter 

 and more roughly knotted, than in JE. reticulata and its allies. The 

 sides are slightly constricted, and the anterior end is a little flattened 

 so as to form an obtuse angle on each side extending from the apex to 

 the margin. 



14. Arca bicarinata, n.sp. PL XXII, Fig. 14. 



Testa oblonga, crassa, costis numerosis angustis nodulosis instructa, 

 antice truncata, postice elongata, acuminata, valde concava, et curvatim 

 biangulata, inferne haud hians; umbones remoti, incurvati, prominentes, 

 ligamenti area lata, leviter concava ; ligamentum fuscum, sulcis paucis 

 sculptum. Long. 19, lat. 9, crass. 13 mm. 



This species is remarkable for the concavity below the dorsal 

 margin, throwing into prominence two rounded angles or keels. 



