DESCRIPTIONS OF AUG ULID.Ii^ 1 VILSON. 629 



This makes the lateral areas wide anteriorly ai)d lea\es a thoi'acic 

 area (/) posterior to the sutuiv wiiich is actually longer than it is 

 wide, a condition rareh' found among- the Argulidje. From the sides 

 of the horseshoe suture near its anterior ends a well-detined secondary 

 suture (.v.y) extends backward on either side in a liroad outward sweep 

 through the center of the lateral area nearly parallel with the margin 

 of the carapace. These sutures divide each lateral area into an outer 

 and an iimer portion, the former of which can lie flexed on the latter, 



12 4 m »'. 



Fig. 1. — DoKSAi, vikw of jiai.e ARot'i.rs america.nts. 



thereby greatl\' increasing the mobility of the carapace. The free 

 thorax is entirely concealed beneath the overlapping lobes of the cara- 

 pace which also cover the anterior third of the abdomen, giving this 

 argulid a ver^' compact appearance in dorsal view. The abdomen is 

 broadly triangular, one-half wider than long, with all its angles well 

 rounded. The lateral margins project forward slightly, suggesting a 

 heart shape. The anal sinus is triangular, cut less than a third the 

 length of the abdomen and carries the anal papilhe upon its lateral 

 margins close to the tips of the lobes. The papilUe are st)mewhat 

 club-shaped, rather short and l)lunt, and each is tipped with three 

 sette of medium lenoth. 



