The Classification of Animals. 



195 



applies to them. The carapace of the Cirrhipedes (Figs. 87, 88) 

 is strengthened by a number of separate calcareous plates. The 

 body is not well segmented, and the abdomen is rudimentary. 



The Malacostraca are divided into three orders, as 

 follows : — 



(i) Leptostraca. — This order only includes Nebalia, and a 

 few allied forms, which agree with the Entomostraca in having 

 a bivalved shell, closed by special muscles, as in Ostracoda, and 



Fig. 87. — A Cirrhipede {Lepas). (From 

 Claus-Sedgwick's "Zoology.") 



Fig. 88 A Cirrhipede (^Batanits). (From 



the same source as Fig. 87.) 



in having a larger number (eight) of abdominal segments than 

 are found in the remaining Malacostraca. The thoracic limbs 

 are much like those of Apus, being multilobate, and not on the 

 biramous type of the higher Crustacea. The last segment has 

 two long processes (" furcae "), another Entomostracan feature. 

 (2) Thoracostraca. — In this division all or most of the 

 thoracic segments are united with the head by a cephalo- 

 thoracic fold ; the eyes are nearly always stalked. It is again 

 divided into the Cumacea, small Crustacea, with four or five 



