61 



The species of Homola may be groiiped in three subgenera, as foUo-ws : — 



(1) Homola (Type H. harhata). Carapace quadrate, its broadest part being 

 in front, across the middle of the gastric region : the lines^ anomuricse keep close 

 to the lateral borders and are rather inconspicuous. Rostrum a bifid tooth, with 

 a small spine or tooth on either side of its base. The last pair of le^s reach to 

 the end of the preceding pair. 



(2) HoMOLAX (Type H. megalops). Carapace urn-shaped, its broadest part 

 being behind, across the middle of the branchial regions : the linex anomuricse 

 run well inside the lateral borders and are conspicuous. Eostrum as in Soimla. 

 The last pair of legs reach beyond the carpus of the preceding pair. 



(3) Paeomola Wood-Mason (Type H. cnvieri). Carapace decidedly macru- 

 rous in form, its greatest breadth being behind : i\\e liacse anomuricse yxvo. ^\e\l 

 inside the lateral borders and are very conspicuous. Rostrum a simple cylindrical 

 spine, flanked on either side by a spine of equal or greater size. The last 

 pair of legs do not reach beyond the end of the merus of the preceding pair. 



Subgenus Homola. 

 Homola andamanica, Alcock. Plate IV., fig. 20. 



Homola andamanica, Alcook, Investigator Deep-Sea Brachyura, p. 7, anil Illustrations of the Zool. of tlie 

 Investigator, Crust., pi. xl., 6g. 1 : J. A. S. B., LXVIII., pt. 2, 1899, p. 156. 



Carapace elongate-subquadrilateral, its greatest breadth is across the middle 

 of the gastric region, behind which point its sides are quite straight and vertical : 

 it is well calcified, and, hke all other parts except the antennary flagella, is 

 covered with short soft but stiff hairs that are not thick-set enough to form a 

 coat of concealment. 



Rostrum a depressed dorsally-grooved tooth, bifid at tip. Four spines on 

 the anterior border of the carapace, namely, one on either side of the rostrum 

 and one at either supra-orbital angle. 



Lateral borders of dorsum, of carapace straight, very slightly convergent, 

 spinate ; the first spine, which stands alone on the hepatic region, is of pre- 

 eminent size, the second though much smaller than the first is much larger than 

 any of the others. 



Gastric region very well demarcated, armed with nine large spines — three 

 in a triangle on either median area, one on either lateral area, and one on the 

 hinder part of the central area. 



Some spines on the subocular, subhepatic, and pterygostomian regions — 

 lai'gest on the subocular region, where they are definitely arranged in two 

 crescentic rows. Two spines on the carapace outside the antenna-peduncle, in 

 addition to the spinuliform suborbital angle. 



