CRUSTACKA. 319 



notches, but the posterior and lateral margins of the third segment 

 of the postabdomen are armed with a series of small spinules which 

 do not extend over the dorsal surface, but reach downward to the 

 postero-lateral angles ; there are also one or two small spinules or 

 teeth at and near the postero-lateral angles of the first and second 

 postabdominal segments ; the eyes are much narrower and (trans- 

 versely) longer than in M. suh nsis, the first peduncular joint of the 

 inferior antennae is somewhat longer and slenderer; the wrist and 

 palm of the first legs (gnathopoda) are much more hairy ; the spine 

 on the posterior surface of the merus-joint of the second legs is 

 much shorter, the wrist longer, and the palm perhaps rather more 

 slender and hairy, with a less distinctly defined distal notch, behind 

 as well as in front of which are one or two small teeth ; the three 

 posterior legs are slenderer, with the distal angles of the merus- 

 joints acute but not prolonged into spines ; the rami of the posterior 

 uropoda are subequal. but much longer than in Megamcera suensis 

 aud less acute. Colour (in spirit) light yellowish brown. Length 

 about 5 lines (11 millim.). 



A single specimen was obtained at Albany Island, 4-5 fms., with 

 the preceding species ; also two from Prince of Wales Channel, 

 7-! 1 fms. ; and one from Thursday Island, 4-5 fms. (Xo. 165). 



In the long rami of the posterior uropoda this species somewhat 

 resembles M. mastersii, Haswell, from Port Jackson ; from which, 

 however, it is distinguished by the larger narrow eyes and the 

 somewhat excavated and less distinctly toothed distal margins of 

 the palms of the second legs ; nor does Mr. Haswell mention the 

 spinules of the third postabdominal segment, &c. 



From Mosra rubromaculata, Stimpson, it is distinguished by the 

 entire non-pectinated postero-dorsal margins of the postabdominal 

 segments, the narrow eyes, and the non-defined distal margin of the 

 palms of the second legs. 



It is also apparently verj r nearly allied to the British Megamcera 

 temiserrata and M. brevicaudata, Spence Bate, and may be enly a 

 variety of one of these species ; but in M. semiserrata the eyes are 

 represented as less narrow and elongated, and the dactyli of the legs 

 of the second pair are serrated upon the inner distal half, and in 

 M. brevicaudata the palm has the inferior margin less distinctly 

 defined and more convex in its distal portion *. 



I may note, in conclusion, that Kossmann has described f two 

 species, Mcera eryihrcea and M. massavensis, from the Eed Sea, 

 which appear to be distinguished from all the foregoing species of 

 Mcera and Megamcera by the form of the palms of the second legs. 



9. Podoceras australis, Haswell. 



Five male specimens were obtained at Port Jackson from weed 

 on the ship's bottom. 



* M. semiserrata is one of several Ampkipoda which it would seem are inaccu 

 rately marked in Mr. Spence Bate's Catalogue as represented in the Museum. 



+ Zool. Ergebn. einer Reise im roth. Meeres, pp. 132, 133, pi. xiv. 

 figs. 1-11 (1880). 



