98 



convexior, aeque long:; ac lata; apice reetangulari, truncato, 

 lateribus incumbentibus ; foramine modico, circulari : apophysis 

 branchialis tenuissima, reflexa, incumbens. Diam. £ ; alt ] poll. 



Ual>. Pugei Sound, Oregon. 



Jt has the same form and color and .surface as T. vitrea, but 

 is more rounded in front, tin' incurved areas of the beaks much 

 broader and Hatter, the ligament aperture larger. &c. Like 

 other species of the genus, it varies much in form, some being 

 quite globose, while others are compressed. 



Mactka debilis. T. parva, alba, tenuis, transversa, elongato- 

 ovata. antice ovata. postice acuta, valde hians; valvis tumidis, 

 postice compressis; umbonibus eminentibus acutis, antemedia- 

 nis: cardo debilis; dente V-formi parvo ; dentibus lateralibus 



curtis, acutis. Long. If; alt. 1 ; lat. 1 poll. Hub. Singapore. 



A very delicate species, resembling in all its outlines small 

 specimens of Mya arenaria. 



\',[ LLA PARALLELA. T. ]>ar\a. tenuis, cylindracea, lactea, 

 antice rotundata, postice conica, imperforata, longitud. minutissime 

 striata, ad verticem et ad basim striis undulatis decussata: 

 apertura angusta, deorsum dilatata ; columella callo hand appresso 

 induta ; labro ultra spiram adscendente, tunc deorsum intorto. 

 L,,ng. &; lat. I poll. Hob. ? 



Smaller and thinner than B. xnli<lnl<<, though striated at the 

 iiids like it, and having the >ame conformation of the lip. Its 

 sides are parallel. 



TORNATELLA I'.L'LLATA. T. parva, ovata, tenuis, albida, 

 epidermide stramineo fugacissimo induta. spiraliter sulcata, sulcis 

 linearibus ad 5 ordinatim dispositis in singulis anfractibus : spira 

 prominula, turrita ; anfr. 5 tabulatis, ultimo magno, ventricoso, 

 L5-sulcato, supernis planulatis; sutura canaliculata : apertura 

 semilunaris; columella uniplicata, planulata. Long. \; lat. $ 

 poll. Dredged off Patagonia. 



This little species like T. pancto-striata and T. venusta, to 

 which it is allied, ha3 not the ivory surface of most species. It 

 is well characterized by its form and sculpture. 



HALIOTIS CRISPATA. T. parva, tenuis, convexa, elongato- 



