40S Surg.-Capt. A. Alcock on 



Family Homolidae. 



HOMOLA, Leach. 



96. Ilomola megalopsy sp. n. 



Carapace quadrilateral, its greatest breadth being fifteen 

 sixteenths of its length, its surface like that of the appendages 

 finely and sharply granular and pubescent. Viewed from in 

 front the front edge of the carapace has the form of an ex- 

 tremely well-marked double IKi-shaped curve, armed through- 

 out its extent with sharp spines and culminating in a concave 

 declivous rostrum with a slightly cleft tip ; a pair of spines 

 on either side of the rostrum, forming the armature of the 

 front proper, are stouter than any of the others, and imme- 

 diately behind the inner spine of each pair is a sharp tubercle. 



The rostrum itself in its basal portion descends between 

 the antennules as a vertical plate which ends in a sharp 

 epistomial spine. The lateral margins have a slight elegant 

 double curve, are very regularly spinulate up to the level of 

 the hepatic region, and end in a strong spine at the antero- 

 lateral angle. 



The gastric, cardiac, hepatic, and branchial regions are all 

 distinctly delimited ; the gastric region is crossed from side 

 to side by a sinuous row of seven spines, and each hepatic 

 region is surmounted by a puckered eminence. 



The segments of the abdomen are all distinct and separate 

 in both sexes, the second segment having a sharp sjiine 

 centrally; all are granular and pubescent, and in tlie third to 

 sixth the granules have a tendency to concentrate in a raised 

 transverse band. 



The eyes are very large, their major diameter being about 

 one iifth the length of the carapace ; they are borne on long, 

 slender, granular, and hairy eye-stalks, and the hairs at the 

 corneal margin form a heavy fringe. 



The auditory tubercle is very prominent. 



The external maxillipeds, like the other thoracic legs, are 

 granular and hairy ; the outer edge of their ischiopodite and 

 meropodite is carinated, the carina of the meropodite forming 

 a ))rojccting lobe. 



The chelipeds are symmetrical in both sexes and are about 

 a carapace antl a half in length ; the three crests of the ischio- 

 ])odite and meroi)oditc, the four or live crests of the carpo- 

 podite, and the single (su])erior) crest of the palm are closely 

 spiny, and the iingers, which are about the same length as 

 tlie palm, have the cutting-edge sharp and entire. 



