1899.] A. Alcock — Garcinological Fauna of India. 93 



Anim. sans. Verfcebr. V. p. 255 : Latreille, Hist. Nat. Crust. VI. p. 53 : Leacb, Zool. 

 Miscell. II. p. 147 : Desmarest, Consid. Gen. Crust, p. 99 : Milno Edwards, Hist. Nat. 

 Crust. I. 465 : De Haan, Faun. Japon. Crust, p. 10: A. Milno Edwards, Ann. Sci, 

 Nat., Zool., (4) XIV, 1860, pp. 283, 228, and Archiv. du Mus. X. 1861, p. 419 : Miors, 

 Challenger Brachyura, p. 207. 



Carapace extremely broad. Its antero-lateral borders are almost 

 transver.se in the greater part of their extent and then turn obliquely 

 backwards to end in a large spine; they are deeply grooved along their 

 whole extent to receive the enormously elongate eye-stalks. The groove 

 is an extension of the true orbit, which also encroaches on the doi sal 

 surface of the front, so that the true fiont comes to lie beneath the 

 roots of the eye-stalks, cut off from the rest of the carapace except for 

 a narrow isthmus left between the eye-stalks. 



The true front, which thus lies below the eye-stalks but in its 

 normal relation to the anteunules and antennae, is extremely narrow. 



Close behind the spine that terminates the antero-latefal border is 

 another, smaller, spine. 



The eyes are borne on slender basal stalks of peculiar length : the 

 orbits, as already explained, occupy the whole extent of the antero- 

 lateral border, even extending on to the lateral epibranchial spine. The 

 antennules are lodged in fossae beneath the front, into which they are 

 not completely retractile. 



The antennae are also in their normal position in the wide orbital 

 hiatus : the basal joint is short, the flagellum long and slender. 



The epistome though short, or even linear, and though encroached 

 upon by the external maxillipeds, is well defined. Buccal cavern 

 squarish broader than long : efferent branchial channels ill defined. 



Chelipeds legs and abdomen as Neptunus. 



As M. A. Milne Edwards has remarked Podophthalmits is merely 

 an abnormal Neptunus. 



65. Podophthalmus nacreus, n. sp. 



Carapace broadly hexagonal, approaching the oblong-quadrate, its 

 length just over half its breadth (lateral spines included) its regions 

 fairly well delimited, its surface finely granular. 



Front proper (that is, the piece almost cut off from the rest of the 

 carapace by the encroachment of the eye-sfcalks) horizontal, distinctly 

 bilobed, its breadth about a sixth that of the carapace (spines 

 included). 



Antero-lateral borders distinctly arched, or angularly bent, the 

 lower edge of the groove for the eye-stalks very prominent and form- 

 ing almost a quadrant of a broad ellipse, the lateral epibranchial spine 

 short — its length about half the width of the front. 



