100 A. Alcock — Carcinological Fatma of India. [No. \ r 



Key to the Indian species of Lophactcea. 



I. Regions and sub-regions of the carapace very distinct ; 

 postero-lateral borders slightly concave, but not de- 

 finitely marked off from the rest of the carapace : — 

 i. Surface of carapace more or less covered with 

 pearly granules: — 



1. Hand sharply crested along upper border :— 



a. Pearly granules over the whole of the 

 carapace, and over the outer surface 

 of the carpus and propus of the walk- 

 ing legs L. cristata. 



b. Pearly granules absent from part of 

 the post -cardiac region and from the 



walking legs L. semigrano&a. 



2. Upper border of hand not crested : — 



a. Crest-like margin of antero-lateral 



border of carapace simply cleft L. granulosa. 



[6. Crest-like margin of carapace deeply 



eroded L.fissa.~] 



ii. Surface of carapace and of appendages perfectly 



smooth L.anaglypta. 



II, Regions and sub-regions of the carapace so faint as to 

 be visible only on close inspection ; postero-lateral 

 borders remarkably concave, and defined by a row of 

 sharp beads or teeth L. corallina. 



25. Lophadsea cristata, A. Milne Edwards. 



Lophactaea cristata, A. Milne Edwards, Nouv. Archiv. du Mus. I. 1865, p. 24fi T 

 pi. xvi. fig. 1 •• de Man, Notes Leyden Mus. III. 1881, p. 95, and Arch, fur Naturges. 

 LIU. 1887. i. p. 246 : F. M tiller, Verh. Ges. Basel VIII. p. 474 : Ortmann, Semon's 

 Porschungsr. (Jena. Denkschr. VIII.), Crustacea, p. 50. 



Carapace symmetrically intersected by broad smooth rather deep 

 furrows, which delimit and subdivide the regions, the strongly marked 

 convexities of the regions and subregions being closely studded with 

 pearl-like granules : similar, but larger, granules occur in linear series 

 on the outer surface of the wrist and hand ; and similar, but smaller, 

 granules are found on the outer surface of the corresponding segments 

 of the legs. The under surface of the carapace is finely granular and 

 more or less furred. 



The whole supra-orbital border is tumid, with a row of pearly 

 granules. 



The crest of the antero-lateral border is divided into four broad 

 segments by three narrow fissures. 



Upper border of the arm and hand strongly and sliarply crested, 

 fingers fluted. 



