Transactions and proceedings of the Royal Society of South Australia (Incorporated) . is from 33 to 43. The ridges have a slight wavy outline owing to the pre-sence of tiny prominences on them and, at first sight, seemto be arranged in a simple spiral, but they are at least on agreat part of the body, apparently along the lateral lines(figs. 18, 19), interrupted in a manner somewhat like that Figs. 10 to 12, tail ends of males. 10, 0. gutturosa. 11, 12, 0. gibsoni. 13 to 15, heads of males. 13, 0. guttu-rosa. 14, 0. lienalis. 15, 0. gibsoni. 16 and 17, heads of , 0. guttu
Transactions and proceedings of the Royal Society of South Australia (Incorporated) . is from 33 to 43. The ridges have a slight wavy outline owing to the pre-sence of tiny prominences on them and, at first sight, seemto be arranged in a simple spiral, but they are at least on agreat part of the body, apparently along the lateral lines(figs. 18, 19), interrupted in a manner somewhat like that Figs. 10 to 12, tail ends of males. 10, 0. gutturosa. 11, 12, 0. gibsoni. 13 to 15, heads of males. 13, 0. guttu-rosa. 14, 0. lienalis. 15, 0. gibsoni. 16 and 17, heads of , 0. gutturosa. 17, 0. lienalis. 18 and 19, parts of body offemale 0. gutturosa. 18, body width, 270 mm. 19. body width,•120 mm. 20, small spicule of 0. gutturosa. 21, scale to whichfigs. 10 to 17, 19, 20 were drawn. 22, scale for fig. 18. 236 figured (probably diagrammatically) by Joan for 0. hovis(Argentine material), and exactly like that indicated byNeumann (1910, p. 275) for 0. gutturosa. The arrangementof the ridges varies, then, according to the position fromwhich they are
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscience, bookyear1912
