161 



paucispirale, apice excentrico, extus granulate Axes, 7 millini. In- 

 habits Simoda. W. S. 



CHiENA lagenula. T. elongata, arcuata, tenuis, lactea, postice 

 quadrangularis, antice declivis et in rostram protracta ; umbonibus 

 ventricosis ad quadranteni anticalem positis ; margine dorsali postiea 

 recta ; niarg. ventrali incurvata ; angulis posticis rotundatis ; facie 

 dorsali late ovato-cuneata, postice cito angustata ; facie ventrali ovata 

 omnino hiante. Long. 12 ; lat. 6 ; alt. 3 niillim. Inhabits Hong Kong 

 harbor, 10 fathoms, shelly sand. W. S. 



Animal like that of Gastrochaena ; but the mantle envelopes all the 

 anterior portion of the shell, and also the anterior half of the ventral 

 margin. 



This shell belonging to the builder of the old Fistulana lagenula 

 of Lamarck, has not heretofore been described, though the curious 

 flask-shaped enclosure has been familiar. The shell has the general 

 characters of that of Fistulana clava Lk, Chaena mumia Gray. 

 Still the ovate, curved form and the sculpture of the shell, and the 

 peculiar, artichoke-like or bulbous structure of the enclosing capsule, 

 made up of successive calcareous cups involving bits of shell and 

 sand, together with the proportions of the animal will, I think, 

 authorize a generic distinction. I would propose, in that case, 

 the name Cucurbitula, which at once expresses the cup-like ele- 

 ments and general gourd-like form. 



Thracia ptjsilla. T. minuta, rotundato-ovata, flavescens, antice 

 late rotundata, postice truncata (angulo dorsali recto) concentrice 

 exiliter undulata ; umbonibus vix postmedianis ; declivitate umbonali 

 angulatii. Long. 8 ; alt. 5 ; lat. 4 millim. Inhabits Simoda. W. S. 



A little like T. myopsis, Beck, which seems to be the same as Anat. 

 papyracea Say. 



Thracia cultrata. T. parva, alba, tenuissima, ovato-rhom- 

 boidea, ventricosa, intus argentata, antice semi-elliptica late rotundata ; 

 umbonibus postmedianis acutis ; margine dorsali posteriori declivi, 

 extremitate truncata, angulo superiori acuto; declivitate umbonali 

 acuta ; margine ventrali vix arcuata ; apophysi cardinali triangulari 

 (valva. sinistra ignota). Long. 8 ; alt. 6 ; lat. 4 millim. Inhabits 

 Port Jackson, sandy mud, 8-15 fathoms. W. S. 



Thracia concinna. T. parva, alba, transversa, antice rotundata, 

 postice truncata, convexiuscula, minutissime punctata ; umbonibus 

 postmedianis, declivitate umbonali angulata, valvis magnitudine et 

 convexitate satis discrepantibus : cardo debilis ; fissuril apicali pervia. 

 Long. 1 7 ; alt. 1 1 ; lat. 8 millim. Inhabits Kagosima Bay. W. S. 



Much like T. villosiuscula in outline, but more convex. 



Myodora fluctuosa. T. parva, tenuis, albida, umbonibus fere 

 medianis : valv. dextra convexa, postice triangularis, apice truncata, 



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