8 i Transactions. — Zoology. 



chiefly on the proximal half ; on the outer margin mostly towards the 

 distal part are also a few small tufts of setae, but these lie close along the 

 joint and are very easily overlooked. Palm transverse defined by a short 

 stout tooth and having short stout setse along the whole palm. Dactylos 

 thick and strong, not longer than palm. First two pairs of pereiopoda sub- 

 equal, rather slender, last three broad, increasing slightly in size posteriorly, 

 basos moderately large subrectangular, anterior edge with a few small setae, 

 posterior edge minutely serrate, a very minute seta arising at each serration, 

 meros broad serrated, with moderately long strong setae, carpus expanding 

 somewhat distally, setose ; propodos setose on anterior side only, numerous 

 strong setae arising at the base of the dactylos ; dactylos considerably nar- 

 rower than propodos, ending in two sharp points, the principal one longer 

 and more curved than the other. Inferior edges of first three segments of 

 pleon supplied with several small setae. Posterior pair of pleopoda only 

 reaching very slightly beyond the two preceding pairs, of which the first 

 pair is slender, having the peduncle considerably longer than the rami, 

 rami with long strong setae at their extremities ; second pair stouter, rami 

 with similar long strong setae at end ; third pair having the rami broad 

 and setose more especially on the outer edge. Telson double, each half 

 concave posteriorly with two long setae arising from the hollow, and having 

 another hollow on the outer side towards the distal end with a single seta 

 springing from the hollow. 



Length, about i of an inch. 



Hab. Lyttelton Harbour. 



This species is very close to M. quadrimanus, Dana, M. grossimanus, 

 Montagu, M. viridis, Haswell, M. truncatipes, Spinola, but differs from all 

 in the form of the second pair of gnathopoda. In this respect it closely 

 resembles M. blanchardi, Spence Bate, but differs in having the basa of the 

 three posterior pairs of pereiopoda dilated, in having the secondary appen- 

 dage of upper antenna not so long as the primary flagellum, and in other 

 points. It also resembles M. tenella, Dana, but that species has the base 

 joint of upper antenna " not stout, second very long ; " the two species also 

 appear to differ somewhat in the form of the second gnathopoda, and also in 

 the length of the posterior pair of pleopoda. 



Genus Podocerus, Leach. 

 (Cat. Amphip. Crust. Brit. Mus., p. 252.) 



" Eyes small, situated on a lobe between the superior and inferior 

 antennae. Superior antennae having a secondary appendage, which is 

 generally very minute. Inferior antennae robust, the flagellum consisting 

 of but few articuli and as stout as the peduncle, the hairs towards the 

 extremity being developed into spines, which increase in strength as they 



