Zoological Society. 537 



acutis, posticis subacutis. Elytra sat profunde 8 striato-punctata ; 

 striaque altera vald^ abbreviata versus scutellum ; striis 4 et 5, 3 et 

 6, et 2 et 7, postice conjunctis. Pedes et corpus infra nigra subni- 

 tida. An Helops dentaius, Fab. ? 



Mr. Reeve then communicated to the Meeting " Descriptions of 

 four new species of bivalve shells by Mr. Hanley." 



SoLEN ACUMiNATUs. Sol. testd olbidd, epidermide tenui griseo- 

 viridescente indutd, elongatd, latitudine longitudinem tripliciter 

 superante ; postice rotundatd ; antice acuminatd extremitate rotun- 

 datd ; marginibus arcuatis, ventrali prope in medio incurvatd ; 

 dentibus in utraque valvd duobus, angustis, uno valde minore. 



Long. I ; lat. 2f poU. 



Hab. in flumine Hoogley, Indiarum Orientalium. 



This shell, which has been found in great abundance at the mouth 

 of the river Hoogley, is somewhat allied to the Solen aciitidens of 

 Broderip ; it is well distinguished by its anterior acumination. 



PsAMMOBiA cosTATA. Psum. testd subelUpticd, antice angulatd; 

 postice breviore angitstatd, extremitate rotundatd; pallida, radiis 

 angustis roseo-Uvidis ornatd; transversim irregulariter costatd, 

 costis i'udibus, planulatis, antice subfurcatis ; intus vel purpured, 

 vel aured. 



Long. 1 ; lat. 1| poll. 



Hab. ad oras Novae Zealandise. 



The coarse and somewhat prominent ribs render this shell easily 

 distinguishable from the rest of the Psammobia. 



Cytherea effossa. Cyth. testd ovali-subcordiformi, subcequilaterali, 

 crassd, nitidd, convexd, transversim profundi sulcatd ,- sulcis sub- 

 remotis, interstitiis planulatis ; albido-lividd, lineis angularibus. 

 saturatioribus , venulatd ; ano impresso, lanceolato ; vulva effossa 

 lateribus candidis, fasciis spadiceis undulatis, transversim pictd ; 

 disco interna purpurea, marginibus crenatis. 



Long, f ; lat. li poll. Mus. Stainforth. 



Hab. ? 



The very singular manner in which this and the following species 

 are excavated on the anterior side forms their prominent and distin- 

 guishing characteristic. 



Cytherea excavata. Cyth. testd rotunduto-ovatd, subaquilaterali, 

 postici expansd, antice propter marginis ventralis obliquam curva- 

 tionem angustatd ; crassd, Icevi, nitidd, depresso-convexd, pallid^ 

 fulvd, venis lividis angularibus, plus minusve distinct is, marmoratd ; 

 ano lanceolato ; vulvd valde excavatd, lateribus planulatis , candidis, 

 spadiceo leviter venulatis ; disco interno roseo ; marginibus tenuiter 

 crenulatis. 



Long. 1 ; lat. \^ poll. Mus. Stainforth. 



Hah. ? 



This shell resembles the preceding by its anterior excavation, but 

 differs both in shape and in the absence of the transverse grooves. 



Ann. &f Mag. N. Hist. Vol. xi. Suppl. 2 N 



