148 



with reddish spotted lines ; whorls 6, tumidly flattened, spirally 

 sulcate ; last whorl obtusely angulate at the periphery, suture 

 impressed, aperture ovate, outer lip thin, inner lip refieKed. 



D'Entrecasteaux's Channel, very common, but in all the 

 specimens, except a very few, the spiral grooves and punctuate 

 markings were worn away, and the shell smooth and snowy 

 white. 



LiTTORiNA HissEYiANA. U.S. L. testa minuUssima, glohoso-tur- 

 binata, tenui, ventricosa ; spira hrevi, ohtusa, spiraliter dense striata, 

 albida, strigls olivaceis angidato-itndulatls, scepe confiuentibus picta; 

 anftactibus (5) rotundatis ; apertura orbiculari, integra ; labro iiderno 

 svhreflexo, acuto ; cohimella subperjorata. 



L. shell extremely minute, globosely turbinate, thin, ven- 

 tricose, spire short, obtuse, densely spirally striate, whitish, 

 with angulately undulate olive streaks, which are often 

 confluent ; whorls 5, rounded ; aperture orbiculate, entire ; 

 internal lip sub-reflexed, acute, columella sub-perforate. 

 Dimensions. — These shells are microscopic. They vary some- 

 what in size, but the largest do not exceed 1^ millimetres in 

 length. About 50 specimens were found in the stomach of a 

 Mullet, Agenostoma diemenensis, Rich, probably caught in the 

 Derwent. The olive markings vary into lines and deeply 

 shaded spots ; sometimes the shell is uniformly olive, or even 

 blue black. 



Natica TASMANiCA. U.S. N. testa obtecte umbilicata, deprcsso- 

 orbiculari, crassa, spira brevi, parum exserta ; anfrac. convexis rotun- 

 datis, Icevibus vel oblicpie, dense, minutissime striatis, apertura semi- 

 lunari, horizontalis, columella tenuicida, callositate 2)rominente spirali, 

 sulcata, umbilico angulato-excavato ; ad suturam intus callosam ; 

 pallide, fulva vel albida lineis patlide fuscis vel aurantaceis fasciatis ; 

 basi alba, intus castanea vel fulva. Long. 13. Lat. 16. Anfr. 4. 

 Aper. Long. 10. Lat. 6. 



N. shell, with a somewhat covered umbilicus, depressedly 

 orbicular, thick, with a short but slightly exsert spire ; whorls 

 convex, rounded, smooth, or obliquely thickly and most 

 minutely striate, aperture semilunar, horizontal, columella 

 somewhat thin, with a prominent callosity, which is spirally 

 sulcate; umbilicus angularly excavate; with a kind of callosity 

 within the suture at the mouth ; pale fulvous or whitish, 

 banded with brownish or orange lines ; base white, chestnut 

 or fulvous within. 



This shell resembles N. plumhea more than any other, but 

 is seldom more than half its size, and very much paler in color. 

 Color is so persistent in the genus that it may well be con- 

 sidered a mark of specific value. If this not very common 

 species has escaped previous naturalists, which, as far as I can 

 learn, it has certainly done, it can only be from its having been 



