122 



Transactions. 



setules at the distal end. The relative lengths of the joints of the peduncle 

 are not constant ; the last two joints are sometimes more nearly equal, 

 especially in the male, than is shown in fig. 4, which is taken from a female 

 specimen. 





Fig. 3. — Ceina egregia ; first antenna. 



Fig. 4. — Ceina egregia ; second antenna, from a female specimen. 



Fig. 5. — Ceina egregia ; upper lip. 



The upper lip (fig. 5) is broader than long, its margin evenly rounded 

 and fringed with the usual short setae. 



The mandibles present several characters of importance. They are 

 somewhat slender, curved in the usual way so as to be strongly convex 

 on the outer side, and on this surface they bear a small rounded tubercle 

 about half-way between the base and the apex (see figs. 7 and 9). At 

 the base a strong process projects inwards on the inner or concave surface. 



Fig. 6. — Ceina egregia ; right mandible, seen from inner side. 

 Fig. 7. — Ceina egregia ; right mandible, seen partly from outer side ; 

 molar lappet shrivelled. 



There is no trace of a molar tubercle of the usual type, the animal thus 

 differing from the description laid down by Sars for the Orchestidae 

 (1895, p. 21), in which he says " molar expansion large and thick." In 

 place of the molar tubercle there is a slender lobe or lappet which arises 

 about the middle of the inner concave surface of the mandible, and is bent 



