CRUSTACEA. 317 



this genus or to Megamosra, from Port Jackson, 5-7 fms. (Xo. 104), 

 but which, having lost both pairs of antennae and the terminal seg- 

 ment, cannot be referred to any genus with certainty. It is distin- 

 guished from the various species describe! 1 by Mr. Has well by tho 

 great length of tho first legs, which exceed the legs of the second 

 pair in length, and have the merus considerably produced at tho 

 postero-distal angle, the carpus about twice as long as the propus 

 and truncated at its distal end, propus posteriorly arcuated, dactyl 

 about half as long as the propus : the legs of the second pair have the 

 merus short, carpus more than half as long as the palm and trun- 

 cated at its distal extremity ; palm or propus considerably enlarged, 

 its distal margin oblique and nearly straight, defined at the postero- 

 distal angle by a small spine, and with a truncated lobe or tooth 

 nearer the base of the dactylus, which is strongly arcuated and 

 does not reach quite to the postero-distal angle of the palm. The 

 coxas of the four anterior legs are deeper than the segments with 

 which they are articulated. The three posterior legs slender, with 

 the basus-joints little dilated and posteriorly entire, the merus- 

 joints not distally produced into lobes or teeth. The uropoda are 

 biramose, the rami subequal, those of the posterior pair very small, 

 not foliaceous. The segments of the body are without teeth, spines, 

 or spinules. The coloration (in spirit) whitish, the body covered 

 with numerous small black dots. 



In the form of the anterior legs and in the coloration it resembles 

 Amphithoe setosa, Haswell, from Botany Bay, but differs in the form 

 of the palm of the second leg, and, I suppose, of the posterior 

 uropoda. 



7. Megamcera suensis, Haswell ? 



As Mr. HasweLTs description is very short and our specimens differ 

 slightly from his figure in the form of the second legs, I append the 

 following description : — Body rather robust ; head with a small 

 lateral tooth behind the antero-lateral angles. Coxas of the first 

 four thoracic limbs deeper than their respective body-segments, the 

 first pair not much prolonged at the antero-lateral angles, which are 

 rounded or subacute. The last thoracic segment and the first and 

 second postabdominal segments have their posterior margins armed 

 with two small dorsal spines ; the third is dorsally emarginate but 

 without spines ; the fourth has its posterior and dorsal margins 

 armed with two strong triangulate acute lobes or teeth. The first 

 and second postabdominal segments have a small spinule at their 

 postero-lateral angles ; the third segment has its postero-lateral 

 angles truncated and armed with three to five teeth ; the lobes of 

 the terminal segment, which are subcylindrical, are tipped with a 

 few setae. The eyes are oval, black. The antennae are somewhat 

 hairy ; the superior antennae are broken, but exceed the head and 

 thoracic segments in length ; the basal peduncular joints are thicker 

 and somewhat shorter than the second joints ; the third joints very 

 short ; the slender accessory flagellum is composed of three rather 



