OSTRACODA. 371 



outline is ovate, acuminate in front and rounded behind, greatest width in the middle 

 and equal to fully two-fifths of the length ; shell white, polished, with minute setae 

 and impressed puncta ; the valves are marked with five lucid spots arranged in a 

 semicircular manner; size, - 82 millim. 



A few specimens from the general washings from Gulf of Manaar ; from Cheval 

 pearl oyster washings ; and from Gulf of Manaar sponges. 



At first it was thought this might be a form of Pontocypris trigonella, G. 0. Sars, 

 but a comparison with the figures given in the ' " Challenger" Report,' in the report 

 ' On the Entomostraca from the Gulf of Guinea,' by my father, and in the ' Mono- 

 graph on the North Atlantic and North-western European Ostracoda,' by Brady and 

 Norman, shows that it is distinct. 



Pontocypris elegans, n. sp. Plate I., figs. 19 and 20. 



Shell seen from the side oblong, compressed, subreniform, the height being equal 

 to rather less than one-third of the length ; anterior extremity obliquely rounded, 

 posterior produced and subacute at the ventral angle ; dorsal margin moderately 

 arched, greatest height slightly in front of the middle, and sloping gently towards 

 each extremity ; ventral margin deeply sinuated in the middle ; seen from above 

 compressed, ovate, widest in the middle, width about one-fourth of the length, 

 acuminate in front and slightly rounded behind ; shell white, polished, with a few 

 minute impressed puncta ; the valves are marked with a circular patch of lucid spots 

 and three smaller detached ones; size, - 6 millim. 



A few specimens were found in the same washings as the previous species. 



Pontocypris rostrata, n. sp. Plate I., figs. 21 and 22. 



Shell seen from the side subtriangular, greatest height nearly equal to half the 

 length ; anterior extremity broadly rounded, almost truncate, posterior produced, 

 subacute in the centre ; dorsal margin boldly arched, highest slightly in front of the 

 middle, sloping very gently towards the front, but rapidly to the posterior ; ventral 

 margin sinuated in front of the middle, becoming convex near the posterior end where 

 it turns up to join the extremity ; seen from above ovate, greatest width in the 

 middle and about equal to one-third of the length, acuminate in front and behind, 

 sides distinctly compressed in front, forming a beak-like process ; shell white and 

 polished, valves unequal, the right being slightly smaller than the left ; size, 

 0-64 millim. 



In washings from sponges dredged in the Gulf of Manaar. 



Pontocypris tumida, n. sp. Plate I., figs. 30 and 31. 



Shell seen from the side subovate, the height being rather more than half the 

 length ; anterior extremity rounded, somewhat depressed, posterior subacute ; dorsal 

 margin boldly arched, highest in the middle, ventral slightly sinuated in front of the 

 middle ; seen from above ovate, widest behind the middle, length equal to two and 



3 B 2 



