1918.] R. B. S. Sewell : New species of Copepoda. 13 



Segments i '• 2-4 :5 = 6:7: 8-10 : n : 12 : 13 : 14 : 15 : 16 : 17 : 18 : 19-21 : 

 41 : 120 : 35 : 17 : 18 : III : 23 : 23 : 44 : 35 : 44 : 47 : 73 : iii : 108 : 



22-35. 



150 = 1000. 



The knee-joint is situated between segments 18 and 19 and 

 the '' endabschnitt " consists of two joints only. Segments 2 to 4 

 and 8 to 10 are fused ; the 13th to 17th segments are somewhat 

 dilated, though not markedly so ; the 17th segment bears a tooth- 

 plate which does not extend beyond the distal extremity of 

 the segment; the i8th segment bears a tooth-plate and has two 

 fang-like spines distally as in .4. tortaniformis, and the 19th 

 segment has two tooth-plates. All the tooth-plates are furnished 

 with fine teeth. 



The 2nd antenna , mouth-parts , and swimming legs are similar to 

 those of the 9 . 



The ^tk pair of legs. — Each leg consists of a single ramus. 

 The right leg possesses four segments; of these the basal one 

 is produced distally in a pair of rounded wing-like flaps, which 

 overlap the proximal part of the next segment ; the 2nd segment 

 carries a single seta on its external margin ; the 3rd segment bears 

 a single seta on its internal margin, and the 4th distal segment is 

 pointed and claw-like and bears a single seta on its inner margin. 

 The left leg consists of the common basal segment and three free 

 segments ; the ist segment bears a single bristle externally ; the 

 2nd segment is armed with a small marginal spine distally on the 

 external margin, and the terminal segment bears a single marginal 

 spine on its external border, a small spine on its internal margin 

 and terminates in two unequal spines. 



I have much pleasure in dedicating this species to Dr. F. H. 

 Gravely, Assistant Superintendent, Zoological Survey of India, by 

 whom the collection from Cochin was m'ade. 



Acartiella major, sp. nov. 



(Plate IX, fig. 8 and Plate X, figs. 2, 3 and 6.) 



Numerous examples of both sexes were present in the Chilka 

 Lake collection. 



5 . Total length = 1*41 mm. 



Proportional length of cephalo-thorax and abdomen — 



67 : 33 = 100- 



The head and ist thoracic segment are separate : thoracic 

 segments 4 and 5 are fused. 



The head presents a rounded anterior surface, and the poster- 

 ior thoracic margin is rounded and unarmed. The rostrum is 

 as usual absent. 



The abdomen consists of three segments, having with the 

 furca the following proportional lengths : — 



39 : 31 ; 8 : 22 = 100. 



