172 DISCOVERY REPORTS 



It seems probable that Nordenstam overlooked the presence of the first segment, since his descrip- 

 tion more or less applies to the second, third and fourth segments; this would explain his statement 

 that the abdomen consists of three free segments and a pleotelson. The form of the limbs have been 

 described by Ohlin (1901, p. 291 and pi. xxii, figs. 9, pi. i,p.2, and p. 5); as his figures of these limbs 

 are very small, some have been illustrated in the present paper (Text-fig. 12b, c and g). The second 

 pair of pleopods is modified in the male (Text-fig. 12 A). 



Distribution. Ohlin's specimen was collected from between Isla Neuva and Navarino, in 

 30 fathoms of water; specimens have also been collected at Port Harriet, Falkland Islands (Stebbing, 

 1914), and from rocks at Port Williams, Falkland Islands (Nordenstam, 1933). Specimens in the 

 Discovery collections came from some distance north of Le Maire Strait, South America, and also 

 from waters due north of the Falkland Islands. 



Text-fig. 13. Macrochiridothea kruimeli. (a) Left half of last two pereion somites, abdominal segments, telson and left 

 uropod, X 5. (b) Second pleopod, S, x i?- W Maxillula (right), x 30. (</) Maxilla (right), x 60. (e) Left maxilliped, x 30. 

 (/) Antennule, x 25. (g) Antenna, x 25. (h) Cutting edge of left mandible. (;') Cutting edge of right mandible. 



Macrochiridothea kruimeli Nierstrasz, 191 8 (Text-fig. iZ^~J) 

 M. kruimeli, Nierstrasz, 1918, pp. 130-2, figs. 13, 54-64; Nordenstam, 1933, p. 112. 

 Occurrence. St WS 809: 8. i. 32, 49" 29' S., 66" 21' W., 107-104 mm., 2 ^,^. 



The larger of the two specimens in the Discovery collections is a male measuring 8 mm. in length 

 and 3 mm. in greatest breadth. This is approximately half the size of the female described by 

 Nierstrasz, the length: breadth ratio of which was 5:2. The corresponding ratio of the male is 5-2:2, so 

 that the female is slightly broader in proportion to its length than is the male. 



The Discovery specimens agree in most details with the description given by Nierstrasz. 



The eyes are very small and contain a little pigment. A few short hairs are present along the anterior 

 margin of the head ; these were not present on Nierstrasz's specimen. In the type specimen, the length 

 of the head is said to be as great as that of the second and third thoracic (first and second pereion) 

 somites together, but a measurement taken from Nierstrasz's photograph of this specimen (Plate IX, 



