1898.] A. Alcock — Carcinological Fauna of India. 77 



Section I. Hyperolissa. 



Xanthidse in which the efferent branchial channels are not defined 

 by a complete ridge on either side of the palate. 



i 



Subfamily I. XANTHINE. 



Carapace usually much broader than long, usually transversely oval, 

 sometimes transversely hexagonal. The front is contained from 3| to 5| 

 times in the greatest breadth of the carapace. 



Alliance P. Carpilioida. Carapace broad, transversely oval, the 

 antero-lateral border either entire, or divided into a few broad, shallow, 

 rounded lobes. Legs sub-cylindrical. Abdomen of the male with the 

 3rd and 4th, or usually the 3rd, 4th and 5th segments fused together. 



Alliance II. Zozymoida. Carapace broad, transversely oval, the 

 antero-lateral border in the form of a sharp crest which may be either 

 thin and entire (fissured only) or oat into 4 large teeth. Legs with at 

 least the upper border of the merus carpus and propodus sharply 

 cristiform. Abdomen of the male with the 3rd, 4th and 5th somites 

 fused. 



Alliance III. Euxanthoida. Carapace broad, tranversely oval, 

 very profusely areolated in high relief ; the antero-lateral borders are 

 continued below the orbits to the outer angle of the buccal cavern. 

 The basal antennal joint has its outer angle prolonged and impacted in 

 the orbital hiatus, and the antennary flagellum, which is hardly visible 

 without a lens, arises within the orbit. The abdomen of the male has 

 the 3rd, 4th and 5th somites fused. 



Alliance IV. Xanthoida. Front almost always prominent, square- 

 cut (notched or fissured in the middle line) and sublaminar, aud almost 

 always separated from either supra-orbital margin by a deepish notch. 

 Carapace broad (except Medsens and Etisodes), usually transversely oval, 

 but sometimes more hexagonal ; the antero-lateral border usually cut 

 into sharp teeth. Male abdomen with segments 3-5 fused. 



Alliance V. Halimedoida. Front prominent and square-cut. 

 Carapace pentagonal, moderately broad. Abdomen of the male with 

 all 7 segments distinct, the last segment being more than twice as long 

 as any of the others. 



Alliance VI. Galenoida. Carapace broad, pentagonal approach- 

 ing the quadrilateral, the antero-lateral border hardly longer than the 

 postero-lateral. The basal antennal joint does not nearly reach the 

 front. The abdomen of the male has all 7 segments distinct. The sole 

 type, Galene, is so singular that it might be separated as a distinct 

 subfamily. 



