11 



Cervical groove, and is composed of a median triangular 

 portion having the apex pointing- backwards and two 

 lateral portions which end at the antero-lateral border. 

 The median portion is divided into two anterior Proto- 

 gastric regions (Pg.), a median anterior Mesogastric 

 region (Mg.), a pair of posterior Metagastric regions 

 (Mtg.}, and a median posterior Urogastric region 



FIG. 2. Areas of the Carapace. 



Fr. = Frontal region . 

 Orb. = Orbital 

 Hep. Hepatic 

 PC). Protogastric 

 Mg. = Mesogastric 

 Mtg. Metagastric 

 Ug.= Urogastric 



Mb. = Mesobranchial region. 

 Mtb. = Metabranchial , , 

 Eb. = Epibranchial ,, 

 Card. = Cardiac , , 



C.gr. = Cervical groove. 

 B.gr. Branchio cardiac groove. 



(Ug.}. The lateral portions are known as the Hepatic 

 regions (He'p.}. Each extends outwards to the antero- 

 lateral border and is bounded behind by the outer part 

 of the cervical groove. 



The Thoracic portion comprises that part of the 

 carapace which lies behind the cervical groove. It is 



