108 AUSTRALIAN HALACOSTRACA. 



usually more than half the breadth of the carapace, and divided 

 above into several lobes by longitudinal grooves in the front 

 part of the carapace. Pterygostomian regions reticulated. 

 External maxillipedes with the third joint longer than broad, 

 more or less rounded at the summit. Ambulatory legs ciliate, 

 with the tarsi unarmed. 



197. Sesarma rotundata. 



Sesarma rotundata, Hess, Archiv fiir Nat,, xxxi., p. 149, pi. vi., 

 fig. 9. 



Carapace strongly granulate in front, more finely granulate 

 behind. Hepatic region dilated, branchial regions sloping off 

 obliquely. Front border curved, and armed with three teeth, of 

 which the last is smaller than the others. Front vertical ; of its 

 four lobes those lying nearest the orbits are very small. Legs 

 as in S. atrorubens, but with- the terminal joints more closely 

 covered with hair. Carpus with a four-cornered process on its 

 inner side. Hand thickly beset with tubercles ; fingers strongly 

 toothed on the outer border, with three large teeth on the 

 inner. [Hess.'] 



Sydney (Hess). 



198. Sesarma atrorubens. 



Sesarma atrorubens, Hess, 1. c, p. 119, pi. vi., fig. 12. 



Carapace almost quadrate, the sides nearly straight, armed 

 with three teeth, of which the last is very small. Front directed 

 perpendicularly downwards and almost over-reached by four 

 strongly-marked lobes. Ischia granulated and rather long ; the 

 rest of the joints of the legs ornamented with fasciculi of hairs, 

 especially well-developed on the upper and lower borders ; 

 dactyli straight and sharp. Carpus large tuberculated, hand 

 covered with large tubercles. Fingers strongly toothed on the 

 inner border ; on the mobile finger three, and on the immobile 

 finger two larger teeth ; outer border of the latter smooth ; that 

 of the former ribbed. Colour dark violet. [Hess.] 



Sydney (Hess). 



199. Sesarma similis. 



Sesarma similis, Hess, 1. c, p. 150. 



