366 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



perforations, the septum extends as far forward as the loop; genital 

 sinuses in two small reticulate groups on each side of the posterior 

 half of the pedicel valve. Height of shell 14.0; breadth 11.0; diam- 

 eter 10.5 mm. 



Type locality. — Kagoshima Gulf, Japan, in 103 fathoms. 



This externally resembles T. mariae A. Adams but is folded in the 

 contrary direction. 



CAMPAGES (JOLONICA) HEDLEYI, new species. 



Shell subcircular, smooth except for lines of growth, with minute, 

 not very dense punctation, of a whitish color and rather delicate 

 structure; pedicel valve with a rather short beak and entire foramen, 

 short and slender deltidia, strong hinge teeth rather close together 

 and supported by their props with ample cavities between them and 

 the shell wall; there is a feeble "collar" and a very short but distinct 

 septal ridge ending anteriorly in a small knob from which two shal- 

 low divergent furrows extend forward nearly to the anterior edge 

 of the valve; there is a very slight squarish depression anteriorly to 

 receive a corresponding prominence from the brachial valve; the 

 latter is subcircular with a small distinct rugose concave cardinal 

 process; the cardinal plate is divided clear to the apex of the valve, 

 the dental sockets are deep and the inner lamina curved over so as to 

 make the socket resemble a split tube from which the teeth of the 

 other valve can not be disengaged without fracture; there is a 

 groove between the laminae and the stem of the crura which are 

 short and widely triangular, the lower limb of the loop continuous 

 with the upper limb; the sharp rather high septum extends from 



