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Pinna tasmanica. n.s. P. t. ovato-cuneiformi, tcnui, subrcntricosa, 

 maiyiiillnis rotundatts, sordide olivacea, parpurco ncbulosa, radiatim costata, 

 costis iiitcrdum ohxolctis, suhnodosis, versus manjinem sparsim, irreyulurittr 

 sqiiamosis, squamix ekraiis sitbtubuh'fonnis ; apicc subtruncato, livido. Lour. 

 190. Lat. 85. Alt. 28. 



P. shell ovately cuueiform, tbin, subventricose, margins 

 rounded, soi-didly olive, clouded with purple, radiately ribbed, 

 ribs sometimes obsolete subuodose, and towards the margin 

 sparsely irregularly scaly, scales elevated subtubuliform, apex 

 subtruncate, livid. 



Eare. Ou the north coast only. W. Legrand. This 

 fine Pinna is one of the veiy few of the genus, with the 

 margins rounded and not angulate. In this respect, and in 

 the few irregularly much raised tubuliir scales, it is quite 

 distinct from P. zelania, which is not uncommon in Australia, 

 Mytilicardia tasmanica. C. t. donfjato ovata, in. medio constricta vel 

 tinu profunda distorta, luteola vd sordide alba, epidermide fusca, maxinie 

 incequilaterali, antlco brevissima, subtruncata, jMstlce dikttata, inferne sinuosa 

 et hiante, radiatim costata, umboiiibus minimis compressis ujiproximatis 

 obliquis ; lunula iticonspicua, iwofunda ; costis inaqualibus, irrer/idaribus, 

 ilexuosis,postice lamdlosis et obsoletis, primis in latere antico anyustiorihus, 

 alteris sensim latioribus. Long. 10. Lat. 21. Alt. 14. 



M. shell elongately ovate, narrowed in the middle or dis- 

 tortedjwith a profound sinus,yellowish or sordidly white; with a 

 dusky epidermis, very inequilateral , extremely short anteriorly, 

 subtruncate, dilated posteriorly, sinuous and gaping below, 

 radiately ribbed, with small compressed approximate oblique 

 umbones ; lunule inconspicuous, very deep, ribs unequal, ir- 

 regular, flexuous, lamellose and obsolete posteriorly, the first 

 on the anterior side somewhat narrower, the others becoming 

 gradually wider. 



Blackman's Bay, uncommon. Distinguished from M. ex- 

 cavata by the epidermis, and the ribs being smooth instead of 

 having the lamellar projecting scales. 



Mytilus tasmanicus. n.s. M. t. oblongo-ovali, tumida, crassa, concen- 

 trice tenud irregulariter striata, epirdcrmide atro-purpurea, basim versus 

 sparsim, irregidariter barbata capUlis longis, corneis, discisque calcareis radi- 

 catis ; maryinibus intus extusqus vivide viride peculiariter encaustis ; um- 

 honibus terminalibus, jtarvis, acutis, curvatis nitcntibus, glabratis, parum mar- 

 garataceis; fossulaad llgamentum recipiendum satisprofunda ; pagina interna 

 nirea, impessione pallii et miisculari tantum iridesceftite, ligamcnto longo 

 conspicuo. Long. 175. Lat. 75. Alt. 45. 



M. shell oblong, oval, tumid, thick, concentrically finely 

 irregularly striate, epidermis black jjurple, towards the base 

 sparsely and irregularly bearded with long horny hairs, which 

 are rooted in calcareous discs ; the margins peculiarly enam- 

 elled a vivid green both outside and inside ; umbones small 

 acute, curved, shining, smoothed, slightly pearly, fossula for 

 the ligament somewhat deep ; internal surface snowy white, 



