ISOPODA. 37 



1881, Cilicaea crassicaudata, Haswell, ' Proe. Linn. Soc, N.S. Wales,' vol. 5, p. 475, pi. 17, fig. 3. 

 18S4, Cilicaea latreillei, MlEKS, ' Zool. of the "Alert,"' p. 308, var. crassicaudata, p. 309. 

 1902, Ciliccea crassicaudata, Whitelegge, ' Mem. Austral. Mus.,' Mem. 4, p. 273, fig. 35. 



Male. Miers says, " the segments of the body are covered with a very short stiff 

 pubescence." In the Ceylon specimen the integument is clothed with plumose setules 

 accompanied by thin pellucid undulating fringes, the precise character of which is not 

 easy to determine. Their function may be to retain a concealing coverlet of mud on 

 the animal's coat, as suggested by Doflein (' Brachyura of the " Valdivia," ' p. 203), 

 for the " leaf-hairs " of the Dromiacea and Oxyrrhyncha. The hind region of the last 

 three perseon segments is ornamented with transverse rows of small granules. The 

 long unsutured side-plates of the first segment have the narrowly-squared front apex 

 commonly found in this and some other genera. In contrast to these, the side-plates 

 of the next three segments are extremely short, those of the third segment ending 

 acutely, with the points less produced than those of their neighbours on either side. 

 The anterior division of the pleon projects a thick, apically obtuse, medio-dorsal 

 process over and beyond the telsonic segment, leaving exposed to view the pair of 

 sub-lateral bosses on that segment, but covering both the central lobe and the sides of 

 its apical notch. 



The first antennae in the specimen figured have a flagellum of twenty-one joints. 

 The second antennas in the same specimen show a want of symmetry, in one member of 

 the pair the fourth and fifth joints of the peduncle being considerably longer than any 

 of the preceding joints, the flagellum ten-jointed, shorter than the peduncle, while in 

 the other member the fourth and fifth joints of the peduncle are each shorter than 

 the second, and the flagellum is twelve-jointed, longer than the peduncle. Normally, 

 as shown by another specimen, and in Desmarest's figure, the first antennae are not, 

 as in this instance, longer, but shorter than the second. 



Mandibles with dark horn-coloured cutting edge with dentation obscure, accessory 

 plate bidentate on one mandible, simple on the other, a tuft of spines between this 

 and the prominent molar, palp slender. 



Maxillipeds : The second joint has a sinuous outer margin to the stem, its plate is 

 of moderate breadth, and the ultimate joint of the palp reaches well beyond the lobe 

 of the penultimate joint. 



First gnathopods : Third joint elongate, hind margin carrying many little groups of 

 spinules, front distally channeled and above the groove produced into an obtuse spine- 

 tipped process, fourth joint broader than long, its spine-tipped front apex overlapping 

 the fifth joint, with seven spines along the hind margin ; small fifth joint with five, 

 and sixth joint with six spines along the hind margin, of the last set the sixth being 

 shorter than the one before it, but with this exception, the three successive sets of 

 slightly serrate spines beginning with smaller and ending with larger forms. The 

 finger is strong, as long as the stout sixth joint, ending in two horny nails, of which 

 the short inner one is serrate on its inner margin. 



