152 



SYSTEMATIC ZOOLOGY 



the winter to develop in the spring. They are still capable of 

 developing even after desiccation and freezing, and in some 

 instances at least this appears to be necessary. 



Order 2. Ostracoda 



The Ostracoda (Gr. oarpa/cov, shell) are only one or two milli- 

 meters loner and are found in both fresh and salt water. Thev 



Fig. 144. Dap /mi a similis. A, male, side view, greatly enlarged, i. antennule; 2, antenna; 

 3, testis : 4, vas deferens ; 5, intestine; 8, liver; 9, heart; 11, shell or maxillary gland. B, 

 female, side view, same magnification as A. 1, antennule; 2, antenna; 3, 4, 5, 6, 7, first, 

 second, third, fourth, and fifth pairs of legs; 8, hepatic diverticulum; 9, heart; 10. b: 

 pouch; II, shell or maxillary gland; Thj and /"//■,-, third and fifth thoracic segments; .//, 

 .-/-', Aj, first, second, and third abdominal segments. (After Claus, from Shipley and 

 MacBride's Zoolog) . 1 



