1888.] MYRIOPODA, ETC. OF CHRISTMAS ISLAND. 561 



young of j^. 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^. 



HOMALATTUS AURATUS (L. Koch). 



Homaluttus 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, Grayndah, Peak Downs, and 

 Cape York. 



Sparassid^. 



Heteropoda venatoria (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^. 



Hyl^ocarcinus (Wood-Mason). 



HylcBocarcinus, Wood-Mason, Journ. As. Soc. Beng. xlii. pt. 2, 

 p. 258, pis. XV., xvi. (1873). 



Limnocarcinus, De Man, Notes from the Leyden Museum, i. 

 p. 65 (1879). 



For my reasons for considering Limnocarcinus synonymous with 

 Hylceocarcinus see below. 



HyL^OCARCINUS 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 ; 



