- 5 - adults comprised 90 percent (N=91) of the Herring Gulls as opposed to 80 percent (N=77) in the central third, and 65 percent (N=56) in the southern third. East-west age distribution did not vary as much as north-south. In the eastern half 81percent (N=145) of the Herring Gulls were adults, while in the west 76 percent (N=91) were adults. The difference may or may not be significant. Breeding condition of three adult females collected suggested slight gonad development; the largest ova found were 2.5mm in diameter, but most were closer to 2mm. Fat condition varied from light on one bird to moderate on two. Black-legged Kittiwake (Rissa tridactyla) 189 The number seen is close to that seen during the last survey. Density distribution also approximates that found on the last cruise, i.e., a decline from north to south and from east to west. Age distribution was also variable. In the north section adults comprised 67 percent (N=104), in the central section 23 percent (N=43), and in the south 25 percent (N=16). East-west age distribution was more nearly even with adults comprising 54 percent (N=126) and 43 percent (N=40) respectively. Xantus Murrelet (Endomychura hypoleuca) 7 Sightings were recorded in all three sections of the grid; most were in the western half. Three of the observations were of two birds together. Rhinoceros Auklet ( Cerorhinca monocerata) 19 All but one bird were seen in the north section of the grid, and all but two were in the eastern half. Both the numbers and the distribution are similar to that found on the two previous cruises.