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Show 1888.] MYRIOPODA, ETC. OF CHRISTMAS ISLAND. 561 young of N. nigritarsis. A note by Mr. Lister refers to them as " spiders forming vertical geometrical webs close together in parallel planes with cross-lines between them." ATTID-E. HOMALATTUS AURATUS (L. Koch). Hornalattus auratus, L. Koch, op. cit. ii. p. 1087, pi. xcv. figs. 4, 5. Two specimens. This species was recorded by Dr. Koch from the following localities in Australia-Rockhampton, Gayndah, Peak Downs, and Cape York. SPARASSID./E. H E T E R O P O D A V E N A T O R I A (Linn.). For synonyms of this Spider see Keyserling, ' Die Spinnen Ame-rikas,' Laterigrada, p. 337. This species is found in all tropical countries. An adult female, with egg-bag, and several immature individuals were taken in Flying-Fish Cove. Mr. Lister describes the egg-bag as having been found suspended amongst the irregularly crossing threads of the web. CRUSTACEA. GEOCARCINID.E. HYL^EOCARCINUS (Wood-Mason). Hylaeocarcinus, Wood-Mason, Journ. As. Soc. Beng. xiii. pt. 2, p. 258, pis. xv., xvi. (1873). Limnocarcinus, De Man, Notes from the Leyden Museum, i. p. 65 (1879). For m y reasons for considering Limnocarcinus synonymous with Hylceocarcinus see below. HYLAEOCARCINUS NATALIS, sp. n. Carapace thickly and finely punctured above; posterior two thirds nearly flat, anterior third sloping convexly forwards ; cardiac region with a low elevation on each side in front, wrinkled behind ; branchio-cardiac grooves indistinctly defined; gastric region sharply marked off behind from the cardiac and branchial regions by a groove which curving forwards on each side passes into the hinder-most of the three smooth pale spots, termed by Wood-Mason the " tell-tale marks of descent " ; running obliquely forwards from each of these spots is the conspicuous cervical groove, which in the middle of its course dilates into the second pale spot and terminates in the third at the external margin of the orbit; epibranchial region separated from the mesobranchial by a groove, which anteriorly breaks up and falls short of the superior margin of the carapace |