. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 274 DISCOVERY REPORTS cerebral organs could be seen and the eyes and enormously developed head glands, though the latter did not stain as they had in the free specimens. The lateral nerves had degenerated considerably and the body consisted of a thin investment of basement mem- brane and muscles and a large amount of internal structureless substance in which the gut walls could still be recognized. No genital products could be seen. A specimen of T. gitlliveri taken from red algae off the Point
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 274 DISCOVERY REPORTS cerebral organs could be seen and the eyes and enormously developed head glands, though the latter did not stain as they had in the free specimens. The lateral nerves had degenerated considerably and the body consisted of a thin investment of basement mem- brane and muscles and a large amount of internal structureless substance in which the gut walls could still be recognized. No genital products could be seen. A specimen of T. gitlliveri taken from red algae off the Point in King Edward Cove in March 1930 was full of eggs, so that there is evidence of a form of hibernation in this species. Tetrastemma hansi, Burger, 1893 (Plate XVI, figs. 6, 15; Fig. 50). This species was first collected from the kelp roots in King Edward Cove in October 1925. Thirteen specimens were taken, sketched and noted (N 12). In March 1926 seven specimens differing in colour and body form were collected and described under N 17. These were later proved from their anatomy to be identical with the earlier forms. In April 1927 many specimens were collected of intermediate size and covering the range of colour. In November 1927 a specimen was taken that contained nearly ripe gonads visible through the ventral surface of the body. Several small immature specimens were collected at St. 53 (Falkland Islands) and identified from sections (N 106). Form and colour in life. The length and breadth rarely exceed io-o and i-o mm., though the breadth may be less for the same length. The body is round; the head just visibly marked from the body by its greater width. There are two lateral grooves on each side of the head and two pairs of eyespots. The head tapers to an acute snout. The colour varies from very light brown through shades of yellow-brown to light red and pink. There are sometimes traces of a pale median line down the back, not visible near the head and fading before the tai
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