598 DR. G. S. BRADY OM' 



LoxocoNCHA suBALATA, sp. n. (Plate XXI. figs. 5, 6.) 



Shell, seen from the side, oblong, subrhomboidal, twice as long 

 as broad (fig. 5) ; anterior exti'emity obliquely rounded, posterior 

 very obliquely rounded below the middle ; ventral margin rather 

 deeply sinuated in the middle, curving suddenly upwards behind, 

 dorsal margin perfectly straight : seen from above (fig. 6) hastate 

 in outline, prominently angulated behind the middle, from which 

 point the sides converge with a gentle curve to the anterior 

 extremity, which is sharply acuminate ; behind the two lateral 

 angles the margins converge rather sharply in an irregularly 

 sinuous curve to the posterior extremity : the general contour is 

 thus made of two wedge-shaped portions — an anterior larger 

 wedge and a posterior small one. Shell-surface rough, marked 

 by closely-set small fossse, shar2:)ly elevated in the postero-ventral 

 regions, beneath which it is depressed, forming a somewhat 

 flattened curved lip. Length 0"38 mm. 



Dredged in 70 fathoms. 



Xestoleberis latissima, sp. n. (Plate XXI. figs. 10-13.) 



Shell, seen laterally, oblong, subovate, quite twice as long as 

 broad (fig. 10), highest behind the middle; anterior extremity 

 narrowly rounded, posterior sloping with a steep curve to the 

 ventral margin, where it forms a rounded angle ; dorsal margin 

 forming a somewhat flattened arch, sloping steeply behind, more 

 gently in front, ventral margin nearly straight : seen from above 

 (fig. 11) the outline is excessively tumid, ovate, widest behind the 

 middle, width equal to two-thirds of the length, mucronate in front, 

 broadly rounded behind ; the end view (fig. 12) is very broadly 

 wedge-shaped, widest ventrally where the angles are moderately 

 rounded off, height equal to about two-thirds of the width. Shell- 

 surface perfectly smooth, marked in some cases with a very few 

 small papilliform tubercles. Colour white. Length 0"75 mm. 



Dredged in 70 fathoms. 



The outline shown in fig. 13 may perhaps be referable to the 

 male, the more tumid outline to the female. 



Xestoleberis nigromaculata, sp. n. (Pkte XXII. figs. 1-3.) 



Shell of the female, seen laterally, oblong, subreniform, greatest 

 height situated in the middle and equal to half the length (fig. 1) ; 

 antei"ior extremity depressed, rounded, posterior much wider and 

 evenly rounded ; dorsal margin boldly arched, ventral sinuated in 

 the middle : seen from above (fig. 2) ovate, gradually taj^ering to 

 the anter-ior extremity, which is rather sharply pointed, much 

 broa.der and well rounded behind, width and height equal. Sur- 

 face of the shell smooth, yellowish in colour, with irregular 

 clouded dark patches, and bearing a few very minute distinctly 

 scattered circular papillae. Eye-spots very conspicuous. Length 

 0'55 mm. 



Shell of the male (fig. 3) rather smaller, more markedly 

 depressed in front and more elevated dorsal ly. 



Several specimens taken between tide-marks. 



