Vol. 3] Judaij. — Osfracoda of the San Diego Region. 25 



female has a slightly enlarged portion near the base which bears 

 minute hairs. 



The ungues are distinctly pectinated. 



Length : female 2.8 ; male 2.6 mm. 



Distribution. West coast of South America between Caldra 

 and Antofagasta (Miiller) ; a few specimens were found in the 

 plankton collections made off the coast of southern California in 

 the vicinity of San Pedro and San Diego. 



The specific name, striata, applied to this species by INIiiller 

 was previously used by Clans for another species of ConcJiaecia, 

 so I have taken the liberty of substituting Dr. Miiller 's own name 

 instead. 



7. Conchoecia ritteri no v. sp. 



PI. VI, figs. 6-8 ; pi. VII, figs. 1, 2. 



Shell of female elongated, lower in front than behind, greatest 

 height a little less than half the length ; sub-quadrate in outline 

 when seen from the side ; dorsal margin depressed near the mid- 

 dle ; anterior margin rather strongly curved ; ventral margin 

 sinuous, protuberant posteriorly ; posterior margin sloping back- 

 ward a little so that it forms a more acute angle with the dorsal 

 than with the ventral margin; a conspicuous spine at the pos- 

 tero-dorsal angle, that of the right valve being only about a third 

 as long as that of the left; postero-ventral angle with a short, 

 blunt, rounded process; rostrum rather long, pointed, and di- 

 rected forward ; rostral process of left valve longer than that of 

 the right ; rostral sinus wide and comparatively shallow. 



Entire shell distinctly reticulated; dorsally the sculpture 

 markings consist of striae, for the most part longitudinal, which 

 are broken up into small square or rectangular areas ; anteriorly 

 below the rostral sinus and along the ventral margin the sculp- 

 ture markings are more or less irregular in shape. 



Frontal tentacle of female long, rather stout, and somewhat 

 club-shaped; capitulum long and not very distinctly separated 

 from the stalk, bearing a few rather long slender marginal hairs 

 posteriorly. Antennule with one long curved seta and four short 

 sensory ones. Secondary branch of antenna with two long setae 



