. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 43 Gonads. The ovary is represented in some zooids by a small group of ova in the upper part of the post-abdomen (oik). The testis consists of a long narrow series of many small pear-shaped follicles occupying much of the length of the post-abdomen (t). No larvae were found. Remarks. This species is distinguished from all species of Aplidium described from South America, the Subantarctic, and the Antarctic by the following combination of characters: (1) colony small and lo
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 43 Gonads. The ovary is represented in some zooids by a small group of ova in the upper part of the post-abdomen (oik). The testis consists of a long narrow series of many small pear-shaped follicles occupying much of the length of the post-abdomen (t). No larvae were found. Remarks. This species is distinguished from all species of Aplidium described from South America, the Subantarctic, and the Antarctic by the following combination of characters: (1) colony small and loosely attached to a sandy substratum; (2) stomach with twenty to twenty-four folds; (3) post- abdomen conspicuously narrower than abdomen. It most resembles three species from New Zealand: A. phortax (Michaelsen, 1924), A. benhami Brewin, 1946, and A. adamsi Brewin, 1946. From these species it is distinguished by characters (1) and (3). Distribution. Falkland Islands. Aplidium quadrisulcatum (fig. 6D, E) Holotype. St. 939: size of colony 1 cm. in diameter. Diagnosis of species. Colony of variable shape, with sand embedded in the test. Zooids small; oral siphon with six shallow or deep lobes; atrial opening about one-third of the length of the thorax from the base of the oral siphon; atrial languet with 1 median and 2 short lateral lobes; nine to eleven strong longitudinal muscles; 10 rows of stigmata; stomach with four or five indistinct folds. Occurrence. ?St. 935: North Island, New Zealand, 84 m. St. 939: North Island, New Zealand, 87 m. Colony (Text-fig. 6D). The colonies from St. 939 are small, the largest being 1-3 cm. in diameter. These colonies vary in shape from flat cushion-like masses to single or lobed ovate heads with a narrow stalk. Sand is present on the surface and throughout the common test, rendering the colonies very firm. Systems of zooids are not visible, but a single common cloacal opening is present in each small colony and on each lobe of the larger
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