228 



Memoirs of the Indian Museum. 



[Vor,. V, 



not taken on the shore, but on the bottom in several feet of water. With the 

 females of D. pertinax this was not the case, but it is possible that the eggs in the 

 specimens of this species were freshly extruded. 



Subfamily MACROPHTHALMINAE. 



Genus MACROPHTHALMUS, LatreUle. 



Macrophthalmus gastrodes, sp. nov. 



(Plate XII, fig. 5.) 



The carapace is sub-quadrate, the greatest breadth being only about 1*2 times 

 the greatest length : it is strongly convex both fore and aft and from side to side. 

 The lateral margins are posteriorly divergent, the point of greatest breadth being 

 near the base of the penultimate legs. The breadth across the orbital angles is very 

 little greater than the length (pi. xii, fig. 5). 



The front is obliquely deflexed; though longitudinally grooved above, the 



a. 



b. 



Fig. 9. — Macrophthalmus gastrodes, sp. nov. 



a. Anterolateral border of carapace of the female specimen, left side. 



b. Do. do. do. do. right side. 



c. Carapace of the male specimen, viewed from in front. 



anterior margin is not bilobed, but is straight or very slightly emarginate in the 

 middle (text-fig. gc). The breadth of the front is about one-sixth the breadth of the 

 carapace at the outer orbital angles, a little wider proportionately in the male than in 

 the female. 



The orbits are markedly oblique and rather strongly sinuous. The outer orbital 

 angle is obtuse in both sexes, a little sharper in the male than in the female. Behind 

 it, in the former sex, are three lobular teeth, bluntly rounded and set with small 

 tubercles. The first of these lobes is fully as broad as the outer orbital angle; the 

 second, which is separated from it by a narrow but deep emargination, is much 

 smaller, less than half its breadth ; the third is exceedingly indistinct, a scarcely 

 perceptible protrusion of the finely beaded line that marks the margin of the cara- 

 pace. In the female specimen the antero -lateral borders are not symmetrical. On 

 the left side (text-fig. ga) there are three lobes, similar to those of the male, but 

 less prominent and separated by shallower emarginations. On the right side (text- 

 fig, gb) there is only a single large lobe behind the orbital angle. 



