30 0. A. Sayce : 



Talitpus sylvaticus, Haswell. 

 (Plate XL) 



T. sylvaticus, Haswell, Proc. Linn. Soc. N.S.W., vol. iv., 



p. 245, pi. vii., fig. 1. 

 T. assimilis, Haswell. Proc. Linn. 8oc. N.S.W., vol. v., 



p. 97, pi. 5, fig. 1. 

 T. assimilis and T. affinis, Haswell. Proc. Linn. Soc. 



N.S.W., vol. X., p. 95, pi. X., fig. L 

 T. sylvaticus, G. M. Thomson. Proc. Roy. Soc. Tas. 



1892, p. 15, figs. 1-10. 

 T. sylvaticus, Sayce. Proc. Roy. Soc. Yict., xiii. (n.s.), 



pi. ii., p. 225. 



Body smooth and rather slender, cephalon as long as the 

 first and half of the second segment of mesosome combined. 

 First pair of side-plates distinctly narrowing distally. Third 

 pair of epimeral plates of metasome with margin below slightly 

 and evenly curved, antero-lateral corners evenly rounded, 

 postero-lateral corners right-angled and margin above minutely 

 crenulated. Branchiae vesicular, large, remarkably so on 

 the second gnathopoda and fourth pereiopoda, the latter 

 bilobed proximally. Incubatory lamellae very small, lanceolate, 

 with a few setae at the distal extremity. 



U/Jper antennae, extending to the middle of the last pedun- 

 cular joint of the lower pair : the fiagellum of subequal length 

 to the peduncle. 



Lower antennae, varying in length considerably in speci- 

 mens from different localities ; usually long and slender, last 

 joint of peduncle almost twice as long as the preceding one, no 

 perceptible sexual difference. 



Upper lip large and prominent, broadly rounded distally. 



Mandihhs, without any trace of palp ; that of right-hand 

 side with the cutting edge containing four teeth, and the 

 secondary plate bidentate ; that of the left-hand side with the 

 cutting edge of six teeth, and the secondary plate with a single 

 series of four teeth. In each the molar tubercle is very large, and 

 set with numerous rows of stout denticles ; the spine-row has 

 about four j)lumose sette, and near their base is a tuft of tine 

 cilia. 



