PARAMPHITHOIDAE 173 



Remarks. The large $ (no. 2) is larger than any other known a, and the spiny arma- 

 ture in both specimens of no. 2 is unusually well developed. Peraeon segment 1 has a 

 medio-dorsal subacute tooth, and a dorso-lateral short pointed tubercle. Segment 2 is 

 unarmed, and dorsally is only half the length of segment 1. The dorsal processes on 

 peraeon segment 3 to pleon segment 3 are high, shaped more as in similis than macro- 

 donta in the larger o* , vice versa in the smaller $ ; in the former especially those on peraeon 

 segment 7 and pleon segments 1 and 2. The processes on segment 7 and pleon segment 

 2 in the larger $ (broken off in the smaller) are sub-bifid, the posterior point on pleon 

 segment 2 being very narrow and acute. Side-plate 2 scarcely wider than 1. The 

 horizontal tooth in middle of side-plate 4, which is usually short, or as in most specimens 

 in no. 1 nearly obsolete, is here very strong, projecting laterally almost as much as does 

 the tooth on side-plate 5. 



No further evidence is required to demonstrate that macrodonta and similis are forms 

 of the same species. The extreme forms are easily distinguished, but intergradations 

 may occur. Many of the specimens of no. 1 , especially the smaller ones, have the dorsal 

 processes approximating to the slender macrodonta type. 



The inter- antennal area bears two short acute median tubercles, one just below the bases 

 of 1st antennae, the other just above the base of the epistome. These tubercles are not 

 mentioned by other authors, and were not looked for in the Terra Nova specimens. 



The colour of the no. 1 specimens is given as: "Thoracic and abdominal segments 

 white blotched and striped with yellowish buff, antennae, antennules, distal segments of 

 three posterior legs, and uropods suffused with same colour. Eyes shining salmon pink ". 

 Note 128 for St. 175, and Note 141 for St. 181 give the colour as: "Carapace and 

 abdomen golden yellow, with numerous spots and streaks of bright red. Eyes salmon 

 red", and "Pale creamy buff with faint chestnut mottling. Eyes pink", respectively. 



Distribution. McMurdo Sound; Coats Land; Graham Land; South Shetlands; 

 ' Gauss' winter station. 



Epimeria inermis, Wlkr. (Fig. 104 a). 



Walker, 1903, p. 54, pi. x, fig. 69. 

 Barnard, 1930, p. 374, fig. 40 b. 



Occurrence: 1. St. 170. South Shetlands. 6 ?$ 10-23 mm -> 5 oy ig- ?? 20-28 mm., 1 juv. 6 mm. 

 2. St. 175. South Shetlands. 1 £ 13-5 mm., 2 ?$ 19 and 21 mm. 



Remarks. These specimens confirm the remarks made on the Terra Nova specimens. 

 The description of the 2nd joint of peraeopods 3 and 4 can be improved, viz. hind 

 margin forming in basal third a rounded triangular tooth or projection, then diverging 

 into the outer and inner keels, neither of which is expanded or lobed distally, longi- 

 tudinal keel distinct from base to apex. 



One inter-antennal tubercle below bases of 1st antennae. 



The colour of no. 1 is given as: " Cream-coloured, closely dotted all over with terra- 

 cotta, 5th and 8th [sic] thoracic segments much darker than rest. Antennae, antennules 

 and last five thoracic legs narrowly banded with same colour. Eyes salmon pink ". When 



