UNIVERSITY OF CALIFORNIA PUBLICATIONS 

 ZOOLOGY 



Vol. 3, No. 9, pp. 135-156, Pis. 18-20 January 29, 1907 



L ' 

 ^ " CONTEIBUTIONS FEOM THE LABOEATORY 



OF THE 



MAEINE BIOLOGICAL ASSOCIATION OF SAN DIEGO. 



XIV. 



OSTRACODA OF THE SAN DIEGO REGION. 



II. LITTORAL FORMS. 



BY 



CHAUNCEY JU.DAY. 



As stated in the paper on Haloeypridae, very few of the 

 thousand plankton catches examined were made in the shallower 

 water, and of these only nine contained littoral forms of Ostra- 

 coda. The various forms represented in this small number of 

 catches belong to the two groups Podocopa and Myodocopa. 



PODOCOPA Sars, 1865. 

 Shell never with antennal sinus. The inner branch of the 

 antenna more strongly developed than the outer; the former 

 three- or four-jointed, the latter sometimes two-jointed, but us- 

 ually without joints. ]\Iaxilla always with a respiratory appen- 

 dage ; f urea either rudimentary, or when developed, consisting of 

 slender, elongated laminae which bear few terminal spines. 



Family CYTHERIDAE Baird, 1850. 

 Shell extremely variable in form, usually strongly calcareous 

 and firm; often with a complex sculpture. Antennule with five 

 to seven joints, second and third always fused. Antenna with- 

 out natatory setae; fourth joint of inner branch usually with 

 three claws or setae. Mandible three- or four- jointed ; exopodite 

 usually developed as a respiratory plate. Three pairs of walking 





