ABT. 18 SYNOPSIS OF CALANOID CRUSTACEA MAESH 45 



females. In the female furca (pi. 22, fig. 1) the third seta is much 

 broader than the others. There is no difference in the female fifth 

 feet. In the male fifth feet (pi. 21, fig. 6) the spine at the distal 

 end of the first segment of the right exopod about equals the second 

 segment in forhesi^ but is shorter in inopinus. Burckhardt also makes 

 the depression in the terminal segment of the left foot which sepa- 

 rates the two lobes sharper in forbesi than in inopinus, stating that 

 it is 30° or 40° as compared with 90° ; it is doubtful whether this 

 distinction will hold. 



If it were not for the difference in the furcal setae, one might be 

 inclined to think of inopinus as simply a variety of forbesi. S. 

 inopinus is somewhat smaller than forbesi. 



Length : Female, 1.15 mm ; male, 1.03 mm. 



Occurrence. — Found in the Yangtze Kiang. It belongs more dis- 

 tinctly to the plankton than does forbesi. 



SCHMACKERIA LGBIPES (Gurney) 



Plate 22, Figubes 4, 7, 8 



Pseudodiaptomus loMpes Gurnet, 1907, pp. 27, 28, pi. 1, figs. 4-8. — Sewell, 1924, 

 p. 786, pi. 45, fig. 1. 



Female. — The head is fused with the first thoracic segment. The 

 last segment of the thorax is rounded, and has a small spine on each 

 side. The abdomen has four segments, the first three having spines 

 on the distal borders. The furcal rami are ciliate on the inner 

 borders. The antennae have 21 segments and extend to the abdomen. 

 In the fifth feet (pi. 22, fig. 4) the first segment of the exopod, in 

 addition to the external distal spine, has, near the internal distal 

 angle, a small oval projection. The second segment of the exopod 

 has, besides the terminal hook, small spines of about equal length 

 at the internal and external distal angles and a longer spine between 

 the hook and the spine of the inner distal angle. 



Male. — In the right fifth foot (pi. 22, fig. 7) there is a prominent 

 rounded process on the interior of the terminal hook about midway 

 of its length. The process of the second segment of the basipod of 

 the left foot (pi. 22, fig. 8) is long, curved, and rounded at the end. 

 The second segment of the left exopod is an oval plate with a spine 

 about midway of its outer border and a row of small spines about 

 midway of the inner border. 



Length: Female, 0.35 mm; male, 0,95. These are measurements 

 given by Gurney and must be incorrect; possibly the female is 

 1.35 mm. 



Occwrrence. — Found in Calcutta, India. 



