68 THE VOYAGE OF H.M.S. CHALLENGER. 



[PL XIX. fig. 8, a-c. a Left valve seen from side, h from above, c from front. 

 Magnified 100 diameters.] 



11. Cythere acupunctata , n. sp. (PL XIV. fig. 1, a-h). 



Shell elongated, compressed ; seen from the side, subreniform, higher in front than 

 behind, height equal to about half the length ; anterior extremity broad and fuUy 

 rounded, posterior narrow, subtruncate, scarcely rounded, produced and somewhat angular 

 below the middle ; dorsal margin sloping gently, and almost in a straight line from 

 before backwards, curved in front, but forming a distinct angle behind ; ventral gently 

 sinuated in the middle ; seen from above, compressed, regularly ovate, nearly thrice 

 as long as broad, wddest towards the posterior extremity, sides converging very gradu- 

 ally, and with a gentle curve towards the anterior extremity, which is subacuminate, 

 posterior extremity broadly rounded ; end view very broadly oval. Surface of the 

 shell thickly covered with small, impressed, circular puncta, and at the anterior 

 extremity produced into a not very prominent bordering flange. Length, l-42d of an 

 inch ('6 mm.). 



This species was dredged in the Inland Sea, Japan, on a muddy bottom, 15 fathoms 

 deep. It is very nearly allied to Cythere fuscata, Brady, a European species, and might 

 perhaps, without much impropriety, have been identified with it ; the Japanese shells are, 

 however, more elongated, more nearly reniform, and seen from above are not so acutely 

 tapered in front. 



[PL XIV. fig. 1, a-h. a Carapace of adult seen from left side, 6 from above, c from 

 below, d from front ; figures a-h represent the same views of the yoiing shell. All 

 magnified 60 diameters.] 



12. Cythere luhbockiana, n. sp. (PL XIV. fig. 6, a-d). 



Shell, seen from the side, elongated, curved, scarcely higher in front than behind, 

 height equal to nearly half the length ; anterior extremity obliquely rounded, posterior 

 subtruncate, only very slightly roimded, divided below the middle into four or five 

 Ijroad, blunt teeth ; dorsal margin gently curved, sloping from before backwards, and 

 ending in an obtuse angle, ventral slightly sinuated ; seen from above, compressed, 

 subhexagonal, more than twice as long as broad, with parallel sides, which converge 

 very abruptly and at an obtuse angle behind, but much more gradually in front ; 

 anterior extremity obtusely rounded, posterior acuminate, end view subcircular. Surface 

 of the shell marked with rather vaguely-defined, roundish irregular excavations. Length, 

 l-40th of an inch ('65 mm.). 



Several specimens found in the Booby Island dredging, depth 6 to 8 fathoms, lat. 

 10° 36' S., long. 141° 55' E. 



This seems to occupy an intermediate position between Cythere ohlonga, Brady, and 



