334 ON 'i'HE CRUSTACEAN FAUNA OF A 



This species was the most abundant of those found in the 

 deeper water of the pond. The genus Ectinosoma includes a 

 large number of forms differing only slightly from each other, 

 the differences being in most cases quite unrecognizable with- 

 out careful dissection. I therefore submitted specimens to 

 Mr. Andrew Scott, who, with his father Dr. T. Scott, has 

 made a special study of the genus, and he entirely agrees with 

 me as to their being specifically distinct. 



PROTEOCYPRIS*, nov. gen. 



Swimming setae of the posterior antennae reaching much 

 beyond the apices of the terminal claws ; setae of the first pair 

 of maxillae simple, devoid of lateral spines ; second pair of 

 maxillae in the male strongly prehensile, post-abdominal rami 

 consisting of slender papillae with long terminal setae. Sexes 

 distinct. 



The long swimming setae, the rudimentary post-abdomen, 

 bi-sexual character and marine habitat sufficiently distinguish 

 this genus from any of those hitherto described. 



Proteocypris salina, sp. nov. (Plate lo, figs. 1-12). 



Shell seen laterally (fig. i) reniform, greatest height situated 

 in the middle and equal to rather more than half the length, 

 anterior extremity broad and well rounded, posterior narrov^^er 

 and subtruncate ; dorsal margin evenly arched, ventral 

 sinuated in the middle; seen from above (fig. 2) the outline 

 is elongate-ovate, widest in the middle, and tapering evenly 

 to the extremities, width considerably less than half the 

 length; anterior extremity sharply acuminate, posterior very 

 narrowly rounded, lateral margins evenly curved throughout. 

 Shell very thin, almost colourless, semitransparent, bearing a 

 few fine marginal hairs at the extremities. The two sexes alike 

 in shape, or nearly so. Length -55 mm. Terminal claws of the 

 anterior antennae finely pectinate (figs. 3, 4). Lobes of the 

 first maxillae (fig. 5) digitiform and bearing simple apical and 

 marginal setae ; second maxillae simply palpate in the female, 

 * Proteus, a sea-god. 



