. 3o6 DISCOVERY REPORTS sometimes feeble or obsolete. The dorso-lateral tubercles on the hind margins of seg- ments 2 and 3, present in the Terra Nova $, are here only very feebly developed or quite obsolete. Segment 5 is smooth. A short fine pubescence dorsally on segments 3 and 4 in?. Antenna 1, flagellum 17-18-jointed in <J, 15-16-jointed in $. Antenna 2, flagellum 8-jointed in S, 5-jointed in ?. Gnathopod 2 similar to that of Dodecasella elegans. The rudiment of peraeopod 1 tipped with two setules. Peraeopods 4 and 5 of the type found in Dodecas reducta, with the 6th joint stouter
. 3o6 DISCOVERY REPORTS sometimes feeble or obsolete. The dorso-lateral tubercles on the hind margins of seg- ments 2 and 3, present in the Terra Nova $, are here only very feebly developed or quite obsolete. Segment 5 is smooth. A short fine pubescence dorsally on segments 3 and 4 in?. Antenna 1, flagellum 17-18-jointed in <J, 15-16-jointed in $. Antenna 2, flagellum 8-jointed in S, 5-jointed in ?. Gnathopod 2 similar to that of Dodecasella elegans. The rudiment of peraeopod 1 tipped with two setules. Peraeopods 4 and 5 of the type found in Dodecas reducta, with the 6th joint stouter than in D. elongata, but cylindrical, with two pairs of spines proximally and one to two single spines in middle of inner margin. Branchiae on segments 3 and 4 elongate ovate, II ~V_ c two-fifths to one-third length of their segments. \^ b Brood lamellae with posterior margin of the anterior pair setose. \s /f Colour (as preserved) yellowish white, with X^ scattered reddish or purplish stellate specks, eyes a d reddish-brown. Fig. 169. Peraeopod 1 of: a. Dodecas _ m, ,. r J 1* * * A 00 n^A elonsata, hexacentrum, and Dodecasella Remarks. The discovery of adult <J<J and $$ and ^^L Dodecas reducta. c. Aeginoides juveniles in the same haul (no. 7) confirms the gauss^ aberration. d. Aeginoides gaussi, identification of the Terra Nova <J and ?, and enables normal. one to complete the diagnosis of the species. The tubercles or spines on the adults are evidently subject to variation. It would seem that the lamella on segment 4, which Schellenberg interpreted as the rudiment of peraeopod 2, is really the developing lateral tubercle of the adult. Distribution. 650 59' S, 890 33' E, 350 m.; off Cape Adare and Oates Land, 82- 366 m. Aeginoides gaussi, Schell. (Fig. 169 c, aberration). Occurrence: With other specimens from St. 195 as above. Remarks. A single immature $, 20 mm. in length, found among the above-mentioned adult and young specimens of the typical form, is very interest
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