158 



now it has been confounded with M. producta (A. Adams, 

 Pro. Zool. Soc. 1850 p. 202, sp. 7) which is a narrower shell, 

 less distinctly ribbed, and with a narrow and somewhat con- 

 stricted foramen. 



Auricula (Rhodostoma) dyeriana. n.s. A. t. ovata, inflata, subumhUi- 

 cata crassa, viride alhicante, fulvo bifasciata, striata, striis regularibus, dis- 

 tantibus ; anfract. 6, suturis obsoletls ; sjnra conica, planata ; apertura In- 

 tegra, nitente, pallidefulra ; labro incrassato, bUabiato, intus conspicue triangu- 

 lari inciso etdentato ; labia bidentato; umbilico clauso, marginato. Long. 14. 

 Lat. 9. 



A. shell ovate, inflated, subumbilicate, thick, greenish 

 white, with two fulvous bands, striate, strise regular, distant ; 

 whorls 6 suture obsolete ; spire conical flattened, aperture 

 entire, shining pale fulvous, outer lip thickened, bilabiate, 

 with a triangular notch within, inner lip bidentate ; umbilicus 

 closed and margined. 



North Coast, brackish waters. There is a shell somewhat 

 like this described by Mr. Swainson (Proc. Roy. Soc. Tas. 

 Vol. 3, p. 45), from Dr. Milligan's collection, and probably 

 from Australia, but it is large, of different color, and with a 

 semicircular notch on the outer lip. I have named the 

 species after Mr. Dyer, of Hobart Town, the industrious col- 

 lector, who discovered it at Kelso. 



Pectex marue. n,s. P. t. trigonali-orbiculari, subcequivalva, depressa, 

 valva dextra paido conrexiore, aiirihus imcqualibus, rosea vel roseo-violascente, 

 ncbulis purpureis et lineis viacidisque albis peculiariter marmorata ; costis 8 

 irregulariter long, sulcatis, et obsolete sqwimatis, lirisque parvioribus, inter- 

 mediis incequalibus radiatis, superficie tota tenuiter squamose imbricata ; 

 auribus radiatim costatis, costis nodose imbricatis valvis intus violaceis, ser- 

 iceis. Long. et. Lat. 44. Alt. 16. 



P. shell triangularly orbicular, subequivalve, depressed, 

 right valve a little more convex, ears unequal ; rose color or 

 rosy violet, and peculiarly marbled with purple clouds, and 

 white lines and spots ; ribs 8, irregularly sulcate lengthwise 

 and obsoletely scaly ; radiate with smaller lirse ; surface wholly 

 finely imbricately squamose ; ears radiately ribbed , ribs no- 

 dosely imbricated, valves colored a kind of silky violet within. 



East Coast and Maria Island. Rather uncommon. Nearest 

 to Sowerby's Pccten serratus. The fine shagreen marking is 

 different from P. hifrons, inasmuch as the scales are finely 

 pointed. The violet hue of the inside and silky appearance 

 are very constant. The obsoletely squamose ribs vary, but it 

 is a character not seen in any other Tasmanian species. 



DosiNiA immaculata. n.s. D.t. suborbiculai'i subinjlata ; wnbones versus 

 subattenuata, nivea, subnitida et sub lente deganter irridescenti, umbonibus 

 leviter carneola niacidatis, concentrice tenuiter striata ; striis subtHlissime ele- 

 gantissivieque decussata; area ligamenti anguste lanceolata; lunula parva, 

 late cordata, irapressa, medio carinata, intus alba; sinu palliari prof undo, 

 obtuse triangulato. Long. 20. Lat. 26. 



