723 



58. Venus varicosa (pi. civ. f. 67), 8owerbi/,jun. 



V. testa F.fasciata simili, sed magis elongata; costis coucen- 

 tricis, pqucis, tumidis, ante angulum posticuin terminatis. 



A very awkward shell, which may either be a distinct species, 

 or an abnormal form of F.fasciata, or even F. PajMa ; like the 

 latter, the varices are suddenly interrupted before reaching the 

 posterior angle ; like the former, they terminate without forming a 

 laminar lobe ; they are very much swelled, and the shell is more 

 produced posteriorly than F.fasciata. 



Gulf of Mexico. In Mr. Cuming's collection. 



59. Venus dyseba (pi. clvii. f. 119), Chemn. f. 291-2. Linn. 

 p. 1130. 



V. rotundata, ventricosa, solida, alba, lamellis erectis sequidis- 

 tantibus angustis postice subflexuosis antice unilobatis cincta ; 

 latere postico vix truncato ; margine dorsali arcuato ; area acute 

 excavata, planulata ; latere antico brevi ; lunula convexa ; margine 

 interno crenulato. 



White, more rounded than F.fasciata, with the concentric la- 

 minae distant, narrow, terminating anteriorly in a partly separated 

 lobe, and posteriorly in a slight flexuosity. The dorsal area is 

 deeply and sharply excavated. 



Sidney. Juices. 



60. Venus roborata (pi. clvii. f. 116, 117, 118), Hanley. 

 V. placida, FJiilippi, Abbild. t. 2. f. 2. 



V. testa rotundata, alba, nonnunquam pallide radiata, solida; 

 lamellis rotundatis, elevatis, reflexis, postice angulatis, antice uni- 

 lobatis; latere postico subtruncato; area dorsali planulatim ex- 

 cavata ; latere antico unilobato ; lunula laminata, impressa ; um- 

 bonibus flavidis. 



In F. Dysera the interstices are equal to four ribs, while in this 

 species the ribs are rather broader than the interstices. 



Van Diemen's Land. 



61. Venus thiara (pi. clviii. f. 125-130), Billwyn, p. 162. 

 Chemn. f. 279, 280. V. fohacea, Philippi, Abbild. t. 5. f. 1. 



V. testa obhque subrotuudata, rubro vel fusco radiatim picta ; 

 lamellis concentricis, reflexis, extantibus, latis, postice angulatim 

 productis et bilobatis, antice angulatim productis, ad lunulam 

 elevatis; area dorsali planatim subexcavata ; lunula parva, lamel- 

 lata, impressa; margine interno crenulato. 



