OSTRACODA. 



posterior truncate, with distinct projections above and below ; dorsal and ventral 

 margins boldly convex ; seen from above subovate, fully twice as long as broad, 

 anterior extremity narrow, posterior widely truncate, with a small median process ; 

 for the greater part the sides are nearly parallel, converging rapidly towards the 

 anterior end ; surface of the shell slightly ciliated, covered with small impressed 

 puncta, the valves have four or five longitudinal ribs at the posterior and a number 

 of radiating lines at the anterior extremity ; anterior and ventral margins ciliated ; 

 size, - 93 millim. 



A number of ova-bearing females were found in washings from Muttuvaratu Paar 

 and in the general washings from Gulf of Manaar. The species resembles the last in 

 general shape, but is distinguished by the longitudinal ribs. The postabdomen 

 (Plate II., fig. 38) is much narrower, and the ungues more spinulose. 



Sarsiella crispata, n. sp. Plate I., figs. 7 and 8 ; Plate II., fig. 39. 



Shell thin and flexible ; seen from the side subcircular, broadly rounded in front, 

 slightly narrowed and produced into a wide ciliated beak posteriorly ; seen from above 

 broadly ovate, widest just behind the middle, twice as long as broad ; anterior 

 extremity narrow, posterior truncate, with one median and two lateral projections ; 

 surface covered with large impressed puncta, valves with a number of conspicuous 

 ridges, the two near the posterior end of the dorsal margin forming distinct projec- 

 tions, anterior and ventral margins crenate and ciliated, with a corrugated line a little 

 within; size, 0'8 millim. 



About a dozen mature females were obtained in the same material as the previous 

 species. Postabdomen (fig. 39) with four stout spinulose ungues of different lengths. 



Sarsiella tutnida, n. sp. Plate I., figs. 9 and 10 ; Plate II., fig. 42. 



Shell membranous, thin and flexible. Seen from the side subcircular, slightly 

 longer than wide ; anterior extremity broadly rounded, with a small beak in the 

 centre ; posterior truncate and produced into a wide beak at the lower angle ; dorsal 

 and ventral margins boldly convex, the dorsal forming a distinct hump in the centre ; 

 seen from above broadly ovate, widest slightly in front of the middle, width equal to 

 less than two-thirds of the length, narrow in front, rectangularly truncate behind, 

 with a distinct median projection ; surface of the shell devoid of sculpture, but having 

 a large fold near the posterior end of the dorsal margin ; anterior and ventral margins 

 ciliated; size, l - 26 millims. 



Two mature females of this species were found in the general washings from 

 dredged invertebrates. The postabdomen is narrow and furnished with five spinulose 

 ungues, the longest being about five and a half times the length of the shortest- 

 Future investigation may show this form to be the female of Sarsiella carinata, 

 as the comparative lengths of the ungues on the postabdomen of both species art 

 nearly alike, but in the meantime it is thought best to keep them separate. 



3 B 



