Vou.2] Hsterly.—Copepoda of the San Diego Region. 205 
the genital segment. Middle joint of fifth foot of female about 
as broad as long (fig. 49d); terminal portion of foot as long 
as the rest of the appendage, straight, toothed posterior to 
middle; plumose bristle as long as terminal claw. Second joint 
of right fifth foot of male (fig. 49c) without process on inner 
margin; process of third and fourth joints broader than in 
A. clausi. 
Coloration: Very transparent, without pigment. 
Length: Female, 1.2-1. mm. Male, 1-1.1 mm. 
Occurrence: Enormous quantities may be obtained in Glor- 
ietta Bight, San Diego Bay, especially at night; the species 
occurs rather infrequently outside. 
II Sub-order:-—PODOPLEA. 
Body divided into an anterior and posterior portion but 
the line of separation falls in front of the last thoracic seg- 
ment (fig. 50a); the posterior portion of the body has as the 
first segment the fifth thoracic segment, which bears almost 
without exception a rudimentary pair of feet (figs. 50a, 57b) ; 
these are never of service to the male in pairing. The sper- 
matophores are placed directly upon the genital orifice of the 
female, without the use of a pair of appendages. The genital 
organs of the male are usually paired, their orifices always 
symmetrically placed. The female carries the eggs until the 
young are set free. 
KEY TO THE GENERA OF THE PODOPLEA. 
(The genera marked with an asterisk have been found in the 
San Diego region.) 
1. Inner rami of third and fourth feet 3-jointed, or lacking in 
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3. Head with two large chitinous lenses (figs. 62, 57b)............ 4 
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4. Inner ramus of fourth foot 2- or 3-jointed (fig. 59b)............. 5 
4. Inner ramus of fourth foot 1-jointed or replaced by bristles 
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5. Abdomen with four or five segments which are broadened later- 
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