1913] Esterljj: Copepoda of the San Diego Region 187 



figured in plate 12, figures 43 and 48 respectively; these append- 

 ages have readily recognizable specific structures so far as the 

 members of the genus in this region are concerned. 



Length: 5.8 mm. (eephalothorax 5 mm.) . 



Coloration : Very transparent ; there is a brown band around 

 the twentieth joint of the anterior antennae. 



Occurrence: Haul 2081. 



Augaptilus depressus n. sp. 



PI. 10, figs. 11, 20. 26; pi. 11. figs. 33, 38. 42; ]il. 12, figs. 44, .54 



Adult female. The body is greatly flattened, with rounded 

 head and posterior margins of the thorax ; the rostral filaments 

 are unasually long and delicate, and recurved (pi. 10, fig. 11). 

 The eephalothorax is four and one-third times as long as the 

 abdomen, including the furca, and nearly four times as long as 

 the greatest breadth; the greatest width in the median sagittal 

 plane is half that in the frontal plane. In the abdomen (pi. 10, 

 fig. 20) the genital segment is longer than the other two seg- 

 ments with the furca ; the genital segment is also about five times 

 as long as the second segment and the latter is somewhat shorter 

 than the third. 



The anterior antennae are not quite so long as the eephalo- 

 thorax. The inner ramus of the posterior antennae is about twice 

 as long as the outer and extends back half way to the posterior 

 edge of the eephalothorax ; the larger plumose bristles are irides- 

 cent. The blade of the mandible is shown in plate 11, figure 33 ; 

 figures 38 and 42 are outlines of the anterior and posterior 

 antennae respectively, without the bristles. The bristles of the 

 maxillipeds are provided with the "buttons" which are exceed- 

 ingly minute; only about the distal eighth of any bristle is so 

 equipped ; the remainder of the bristles is spinose. 



The outer ramus of the first foot is shown in plate 12, figure 

 44, and the fifth foot in figure 54 ; both have specific characters. 



Length: 5.3 mm. (eephalothorax 4.3 mm.). 



Coloration : Transparent, except for the digestive tract filled 

 with light yellowish material ; the plumose bristles of the antennae 

 and furca are iridescent. 



Occurrence : Haul 2068. 



