226 ATrSTBAIiIAN MAIiACOSTBACA. 



•gnathopoda small, subchelate, the coxae not developed into a 

 squamiform plate. Second pair of gnathopoda larger than the 

 first, with the coxae very large, squamiform, deeper than the 

 body ; and produced anteriorly so as to cover the organs of the 

 mouth. Pereiopoda subequal ; coxae of the two anterior pairs 

 very largely developed, deeper than the body, and produced 

 posteriorly so as to cover that of the following pair of pereipoda. 

 Posterior pleopoda stylif orm, unibranched, the ramus Particulate. 

 Telson simple and squamiform. 



410. Montagua Miersii. 



MontagiM Miersii, Haswell, 1. c, Vol. iv., p. 323, pi. xxiv., fig. 4. 



Coxae of the posterior gnathopoda and the two first pairs of 

 pereiopoda much deeper than their respective segments. Superior 

 and inferior antennae subequal in length, equal in length to the 

 eephalon and first three segments of the pereion ; the peduncles 

 stout, rather shorter than the flagella. Anterior gnathopoda 

 small, the propodos subquadrate, the palm nearly transverse. 

 Posterior gnathopoda with the propodos large, cordiform ; the 

 palm oblique, undefined. Pereiopoda subequal, rather stout. 

 Colour yellow with brown markings. Length about ^- - in. 



Port Jackson. 



411. Montagua longicornis. 



Montagua longicornis, Haswell, 1. c, Vol. iv., p. 323, pi. xxiv., 

 fig. 5. 



Coxae scarcely so deep as in the preceding species. Superior 

 antennae as long as the eephalon and pereion. Inferior antennae 

 a little shorter than the superior. Anterior gnathopoda with the 

 propodos very small, subquadrate, the palm nearly transverse. 

 Posterior gnathopoda with the propodos long-ovate ; palm 

 undefined ; fringed with long hairs. Length about -is in- 

 Port Jackson. 



Genus Stegocephalus, Kroyer. 



Cephalon short. Antennae short ; superior pair furnished 

 with a secondary appendage. Mandibles without an appendage, 

 with a secondary plate only on the left mandible. Maxillipedes 

 having the second and third joints produced into a squamiform 



