i 7 8 



The second joint of the left basiopodite of the fifth pair of feet is considerably swollen 

 at the proximal end of the inner margin. The swollen part is produced into a small curved 

 tooth. The length of the second joint of the left exopodite is contained two aad a half times 

 in length of the first joint. The palm-like margin of the first joint of the right exopodite is 

 simple, but it is furnished with a thumb-like projection at the proximal end. The claw-like 

 second joint is spoon-shaped, and it is without teeth (Plate XLVIII, fig. 10). 



The apical portion of the second maxillipedes of both sexes is composed of four joints. 



The males and females of Calanopia minor are similar in general appearance to Calanopia 

 americana, and Calanopia anrivillii, but the structure of the fifth pair of feet of the two 

 sexes readily distinguish.es them from either Dahl's or Cleve's species. The exopodite of the 

 female fifth pair is furnished with three spines only. The inner apical spine is long and com- 

 paratively stout. The second joint of the left basiopodite of the male fifth pair has a small 

 but quite distinct tooth on the inflated portion of the inner margin. The fifth pairs of the two 

 sexes are very different from those of Calanopia clliptica. 



This species has hitherto only been recorded from the Red Sea, and from the northern 

 area of the Indian Ocean. 



3. Calanopia thompsoni nov. sp. Plate XLIX, figs. 1 — 8. 



Female — length 2,6 mm. 



Seen from above, the body appears elongate ovate, and rather slender. The forehead 

 is angular in outline. The cephalic segment is furnished with side hooks. The last thoracic 

 segment is produced posteriorly on each side into strong spiniform projections. The rami of 

 the rostrum are moderately stout. The distal end of the inner margin of each ramus is barbed 

 (Plate XLIX, fig. 3). The excavation is rather broadly rounded. 



The abdomen is composed of two segments. The combined length of the abdomen and 

 furca is contained two and one-third times in the total length of the cephalothorax, from the 

 frontal margin to the base of the genital segment. The genital segment is nearly twice the 

 length of the second segment. The ventral surface is produced posteriorly at the distal end 

 into a rounded knob (Plate XLIX, fig. 2). The length of the second segment is equal to 

 rather less than twice the width. The furcal joints are twice as long as broad. 



The antennules are composed of nineteen joints and extend to near the midclle of the 

 genital segment. The third joint is very small (Plate XLIX, fig. 4). 



The antennae, mandibles, maxillae and maxillipedes are almost similar to those of 

 Calanopia elliptica. The apical portion of the second pair of maxillipedes is composed of five joints. 



The four pairs of swimming feet are also similar to those of that species. 



The fifth pair of feet is symmetrical. The exopodite is composed of two joints. The 

 first joint is moderately long. The distal portion of the outer margin is furnished with two 

 very strong spiniform projections. The second joint is narrow and spiniform. It terminates in a 

 moderately long and stout spine. The proximal end of the outer margin is furnished with two 

 spines. The: inner margin bears one spine (Plate XLIX, fig. 5). 



178 



