155 



No. 68. RissoiNA coxcATENATA. n.s. R.t. minuta, domgata, turrita, 

 opaca, alba, quasi crosa ; aiifr. 9, convexis, dccUvis, undique irrefjidar, con- 

 catenatis quasi variolatis ; apicc uuclcoso, lavi, nitente (2anfr.); apertura 

 ovata, labro tenui, labio rejlcxo, subdisjuncto. Long. 2|, lat. | mil. 



Peculiarly pitted ou the surface like the top of a thimble, 

 which gives the shell a roughened worn appearance. North 

 West Coast, W. F. Petterd. I think also that it occurs as a 

 fossil at Table Cape. 



No. 69. DiALA TESSELLATA. Nobis. Sco Fi'oc. Roy. Soc 

 Tas., 1875. Among the species dredged by the Eev. H. D 

 Atkinson there occur some shells resembling the above 

 species, except that they are covered with a dark horny epi- 

 dermis, and the inner lip not reflected, or, at least, scarcely 

 perceptibly so. All my typical specimens were old and some- 

 what worn. It is a question with me whether all ought not 

 to be referred to An gas' Alaha (?) phasianella. 



No. 70. TORNATIXA MAKi.'E. U.S. T.t. parva, ovata, tenui, alba, Icevi 

 polita, spira parum exserta ; anfr. 5 ; nucleo vertical iter sito, suturaprofundt 

 canaliculata apertura anr/usta, medio vix coarctata ; labro acuta; labio antice 

 incraisato ct contorto. Long. 5, lat. 2. Spira vix Ih mil. 



Shell small, ovate, thin, white, smooth polished spire, 

 slightly exsert, whorls 5, nucleus placed vertically, suture 

 deeply canaliculate, aperture narrow, scarcely constricted in 

 the middle, labrum acute ; lip thickened and twisted anteriorly. 

 North West Coast, W. F. Petterd. 



No. 71. Ampdllarina jhxuta. n.s. A.t. minuta, glohosa, alba, solida, 

 nitente, Icevi; anfr. 4, rapidc crescentibus, rotiindatis et tenuissime striatis ; 

 Mpira parum exserta ; sutura impressa ; apertura Integra, late ovata, intus 

 aurantia, tenui, siniplici, umbilico angusto. Diam. 3. 



A minute species of ampullarina, the generic position being 

 however doubtful. It differs from the Tasmanian species 

 (probably only one, though two are described) in its size, 

 absence of color (except in the throat which is orange), smooth- 

 ness, and the spire being less exsert, the shell more approach- 

 ing Natica in form. Circular Head, W. F. Petterd. 



No. 72. AcM^A rr.TTKRDi. n.s. A.t. late ovata, tumida, depressa, apice 

 acuta et submarginali ; nitente, sardide albida, cun/ertissime undulase con- 

 centrice striata lineis incrementi, et irregulariter late sulcis rudis, fulvis, 

 interruptis indistincte radiata ; margine acuta, intus eleganter castanea et 

 fulva Jimbriata ; pagina albida, pallide castanea nebvlosa ; spatula fulva, 

 exacte dcjinita. Diam. maj. 22, miu. 20, alt. 7. 



This Acmcea somewhat resembles an old and enlarged Acmcsa 

 teptiformis, but its size is larger than that species is ever 

 known to attain. It is dull white and shining, with the lines 

 of growth very distinctly marked. North West Coast, W. F. 

 Petterd. Eare. 



No. 73. AcM j:a ALBA. n.s. A.t. late ovata, depressa, scabra, tenui,cdha, 

 luhnitente ; apice submediano, acuta : costis inccqualibus, acutis, parvis 

 numtrotis, imbricato-granosis, aliquando in fasciculis congregatis, radiata; 



