GENUS HOPLOPHORA. 547 



iaiia,' states that HoplopTiora has four joints in the 

 palpus, and Tritia five. 



The Maxillae attain an extreme development in the 

 present genus ; they are large, chitinous, somewhat 

 elbowed organs, which when the creature is extended 

 and seen from the side, as it usually is, are very con- 

 spicuous (PL L, figs. 2, 8) ; they have the distal end 

 broad and dentate (fig. 9) ; the dentition varies, but it 

 generally consists of a somewhat rounded exterior or 

 upper lobe, and three or four sharp teeth along the 

 interior or lower portion {H. inagna). In H. dasyjjus 

 the inner dentition is not so sharp (fig. 9). In if. ardua 

 the rounded external part is large, then there is a plain 

 portion, and then two well-marked, but not very sharp, 

 teeth close together at the inner corner. 



The Mandibles are short, but broad, giving ample 

 room for the powerful muscles which close the chelae 

 (fig. 5) ; they are very conspicuous from the side. 

 The dentition is generally close and powerful, often 

 chiefly carried by an inner ridge on the edge of the 

 chela. 



The Lingua is generally fine and pointed ; not 

 always easy to see, being much hidden by the lingula 

 and the epi-pharynx. 



The Pseudo-stigmata are always small, and are not 

 projecting tubes, but mere holes, provided internally 

 with a sort of grating (figs. 6 and 11) ; internally they 

 are generally covered by a more or less ovoid capsule 

 (fig. 12), and have attached to them, in the species 

 which I have dissected, the three or more minute csecal 

 air-sacs which are shown in figs. 11 and 12, and 

 which are more fully considered in vol. i, pp. 173 — 175. 

 The pseudo-stigmatic organs vary considerably; in 

 H. dasypus it requires some care to find them, in H. 

 stricida they are very conspicuous ; they almost all 

 look filiform if seen on edge. 



The Lamellae are entirely absent, not a trace of them 

 is to be found in any species that I am acquainted 

 with. 



