OSTRACODA 



357 



L. reticulata Sliaipe (Fig. 565). Length .08 mm.; height .35 mm.; 

 breadth .25 mm.; color whitish; shell with conspicuous polygonal 

 markings. 



5 Entocythere* Marshall. First antennae 

 6-jointed, with long jointed bristles; second 

 antennae 4-jointed; mandible with branchial plate: 

 1 species. 



E. cambaria Marsh. Body oval, .6 mm. long; 

 shell thin and smooth: parasitic on gills of 

 Camharus in Wisconsin. 



Suborder 2. MYODOCOPA. 



Fig. .56.5 — Limnxcyfhere 



reticulata — inside 



of left sliell 



(Sliarpe). 



Second antennae biramose, one branch being large and many-jointed 

 and usually with natatory bristles, the other minute; front margin of 

 shell with a deep notch in front for the protrusion of the second an- 

 tennae: 5 families, marine. 



Key to the families of Myodocopa here described : 



«! Eyes present 1. Cypeidinidae 



Cj Eyes absent 2. Halocypkidae 



Family 1. CYPEIDINIDAE. 



Shell with a deep notch in front (antennal sinus); 3 eyes present; 



first antennae stout, 5 to S-jointed, bearing the large sense organ; second 



antennae with outer branch usually 9-jointed; inner branch in male 



3-jointed; mandibular foot 5-jointed, terminating in 



a claw: 2 American genera. 



Sarsiella Norman. Shell of female without 

 notch ; first antennae 5-jointed, with sense organ on 

 third joint in male : 2 American species. 



S. zostericola Cushman (Fig. 566). Shell 1.3 

 mm. long and .86 mm. high in the male and 1.1 mm. 

 long and 1 mm. high in the female, obliquely truncate 

 behind : on eel grass and hydroids at Woods Hole. 



Fig. 566 



Sarsiella zostericola 



(Cushman). 



1, antennal sinus. 



Family 2. HALOCYPEIDAE.f 



Shell very thin and flexible with notch (antennal sinus) in front, 

 above which is a rostrum ; median tentacles present between first antennae ; 

 eyes absent: 3 American genera, all on the Pacific coast. 



1. Halocypris Dana. Rostrum very short, notch small ; shell short 

 and high: 1 American species. 



* See "Entocythere cambaria, a Parasite Ostracod," by W. S. Marshall, Trans. 

 Wis. Acad. Sci., Vol. 14, pt. 1, p. 117. 



t See "Ostracoda of the San Diego Region, I. Halocypridae," by C. Judav, Univ. 

 Cal. Pub., Vol. 3, p. 18, 1906. 



