1878.] ON SHELLS FROM CHINA AND JAPAN. 727 



14. Descriptions of two new Species of Shells from China 

 and Japan. By Carl Bock, F.G.S. &c. 



[Received June 18, 1878.] 

 (Plate XLVI.) 



Tellina wroblewskyi. (Plate XLVI. figs. 1, 2.) 



Shell subovate, slightly inequilateral, gaping at both ends, marked 

 with coarse and rather distant concentric lines of growth, covered 

 with fine radiating strise, pellucid at intervals, with concentric opaque 

 layers, the posterior region also being somewhat opaque. Colour 

 bluish white stained with grey, especially at the posterior end. The 

 latter portion is £ longer than the anterior, acuminately produced, 

 and terminates in a somewhat obtuse angle. Anterior margin 

 rounded, ventral but slightly arcuate, almost rectilinear near the 

 middle ; posterior dorsal slope deeply excavated, the valves being 

 strongly carinate from the umbo towards the posterior extremity, 

 with a deep excavation between the keel and the extreme margin! 

 Cardinal teeth 2 in the left valve, 1 in the right. Anterior muscular 

 impression very elongated near the margin, posterior irregularly 

 quadrate. Ligament situated on a narrow ledge of the posterior 

 dorsal slope, marked off by an incised line, and extending from the 

 umbo nearly 20 millims. In both valves (principally towards the 

 umbones) there are rather large and irregular pittings. Pallial sinus 

 very deep, forming a subacute angle, which extends anteriorly beyond 

 the umbo. 



Breadth 112 millim., length 61 millim., diameter, with the valves 

 closed, 39 millim. 



Hab. China. 



The magnificent species here described is one of the largest of the 

 family (Tellinidae), and resembles in outward appearance certain 

 species of the genus Anatina. 



I propose to associate with this beautiful shell the name of Dr. 

 Wroblewsky of Copenhagen. 



Trochus (Thalotia) yokohamensis. (Plate XLVI. fig. 3.) 

 Shell imperforate, acutely pyramidal, dull white, marked at in- 

 tervals with irregular dark brown blotches, and the base ornamented 

 with brown lines radiating from the centre (where they are paler, 

 almost orange) to the periphery. Whorls 7, quite flat, spirally 

 ridged ; ridges crenulate or subgranular through being crossed by 

 oblique raised striae or lirulee ; on the upper whorls there are about 

 six ridges, and on the last, which is acutely angled at the middle, 

 they are about fourteen in number, that at the carina consisting of 

 two or three small approximated ones, and hence broader than 

 the rest. Aperture slightly oblique, subquadrate, upper half above 

 the carina shallowly sulcate, lower portion smooth ; columella 

 white, callous, terminating in an oblique slight truncation. Greatest 

 diameter 15 millim., length 18. 

 Hab. Yokohama, Japan. 



