50 CLASSIFICATION OF THE ANIMAL KINGDOM. 



(Darwin, A Monograph of the Sub-class Cirripedia, Ray Society, 1851-54 ; 

 Pagenstecher, Beitrage zur Anatomie und Entwickelungsgeschichte von Lepas 

 pectinata, Zeitschr. fur Wiss. Zool., 1863 ; Von Willemoes-Suhm, On the 

 Development of Lepas fascicularis and the 'Archizoea ' of the Cirripedia, Phil. 

 Trans., 1876.) 



Fig. 44. Two fully grown individuals of the common Barnacle (Lepas anatifera), grow- 

 ing upon a foreign body, p, The stalk of attachment ; c, The body of the animal enclosed 

 in a shell, from which the legs can be protruded. 



SUB-CLASS II. ENTOMOSTRACA, 

 ORDER I. OSTRACODA. 



Sub-ord. 1. Podocopa. 



Fam. a. Cypridse. -Cypris (fig. 45), Candona. 

 Fam. b. CytheTidsz.Cythere, Limnocythere. 



Sub-ord. 2. Mydocopa. 



Fam. a. Cypridinidae. Cypridina (fig. 45), *Entomis. 

 Fam. b. Entomoconchidse. Heterodesmus. 

 Fam. c. Conchoeciadse. Halocypris. 



Sub-ord. 3. Cladocopa. 



Fam. a. Polycopidae. Polycope. 



