502 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



forward for a short distance. It is called line d by- 

 Boas. It, with its continuation backwards past the 

 cervical groove, is probably homologous with the linea 

 thalassinica (line 3 of Borradaile). 



For the Text-figure Borradaile' s numbering has been 

 adopted -(p. 501).* It is as follows: — 



2. Boas' line c. — Bouvier's " branchial groove " — 

 commonly known as the cervical groove. 



2 1 . Continuation of cervical groove at the sides of the 

 carapace. 



3. Boas' line d. (front part only), also probably the 

 linea thalassinica. 



4. Linea anomurica. 



5. Soft area at side of carapace. 



6. 6'. Borradaile refers to as " hard plates in this 

 area." In this species calcified bars are present which 

 probably represent similar structures. 



7. Rostrum. 



The Sterna of the cephalo-thoraeic region do not 



require detailed description. Those situated posteriorly 



are mostly very narrow, that of the fourth thoracic somite 



being reduced to a mere bar in an antero-posterior 



direction. This sternal bar is in an interesting 



condition. It is always displaced slightly to the left — 



a modification due, no doubt, to the asymmetry of the 



chelipedes and the greater size of the right limb. All 



the sterna behind the fifth somite are separated by an 



arthrodial membrane, and the last two are again reduced 



to narrow bars — transversely placed — separated by long 



stretches of membrane. The free articulation of the two 



last segments on one another aids in conforming the 



animal to the shape of the shell. 



* Figure of Callianassa (Fig. 125, p. 691), Gardiner's Fauna of 

 Maldives and Laccadives, II., 2. Marine Crustaceans, Pts. X and XI. 



