The Victorian naturalist . era wilsoni (Figure 111, Hale 1927.) 17. Carapace triangular or subcircular((i)) 18 Carapace square or quadrilateral ( (ii)) 28 18. Dorsal surface of carapace flat and oftenwith rostrum protruding over eyes andmouth (Family Hymenosomatidae).. .. 19 Not as above (Family Majidae) 22 19. Carapace shaped like an equilateral tri-angle Elamena (Trigonoplax) unguiformis Carapace roughly circular in shape .. .. 20 20. Rostrum three-toothed ( and Fig. 5-J); margin of carapace angular Halicarcinus ovatus Rostrum simple (not three-toothed); mar-gin of carapac
The Victorian naturalist . era wilsoni (Figure 111, Hale 1927.) 17. Carapace triangular or subcircular((i)) 18 Carapace square or quadrilateral ( (ii)) 28 18. Dorsal surface of carapace flat and oftenwith rostrum protruding over eyes andmouth (Family Hymenosomatidae).. .. 19 Not as above (Family Majidae) 22 19. Carapace shaped like an equilateral tri-angle Elamena (Trigonoplax) unguiformis Carapace roughly circular in shape .. .. 20 20. Rostrum three-toothed ( and Fig. 5-J); margin of carapace angular Halicarcinus ovatus Rostrum simple (not three-toothed); mar-gin of carapace a smooth arc 21 21. Rostrum long, narrow and acute () Halicarcinus rostratus (Figure 114, Hale 1927.) Rostrum blunt and as long as wide Halicarcinus australis (Figure 115, Hale 1927.) 22. Note: In the following species it may be-come necessary to remove weed from thecrab before considering a couplet. Carapace as in Paratymolus latipes (Figure 119, Hale 1927.) Carapace not as above 23 242 Vict. Nat. Vol. 93. Figure 5. Diagnostic characters A-U, referred to in 243 23. Carapace with lateral spines (GenusNaxia) 24 Carapace covered with many long or shorthairs 32 Carapace without lateral spines 27 24. Second-last segment of leg (propodus)very wide and truncated at distal end.(Compare normal shape in (i)with truncated propodus in (ii)) 25 Propodus only slightly widened, but de-finitely not truncated at distal end 26 25. Spines and tubercles (defined in Couplet8) on carapace relatively sharp and long;no spines on the anterior part of thelateral margin of basal antennal segment Naxia spinosa (Figure 125, Hale 1927.) Spines and tubercles on carapace shortand blunt relative to spines on anteriorpart of lateral margin of basal antennal segment Naxia tumida (Figure 126, Hale 1927.) (These two species are very difficultto tell apart and Hale 1927, p. 127, shouldbe consulted.) 26. Small spines on carapace above eyes () Naxia aurita
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Keywords: ., bookcentury1800, bookdec, booksubjectnaturalhistory, bookyear1884
