ISOPODA. 41 



more recent descriptions and figures of the latter by Ives (' Proc. Ac. Sci., Pliilad.,' 

 1891, pp. 188, 194, pi. 6, figs. 11-16), and by H. F. Moore ('Bull. U.S. Fish. 

 Comra.,' vol. 20 for 1900, p. 172, pi. 10, figs. 5-8, 1902), the present form must be 

 considered distinct. Say, in his original account, speaks of the telsonic segment as 

 " marked by a deep sinus, within which are two or four small teeth." Ives, who had 

 six male specimens from Bermudas, takes no notice of the alternative two teeth, but 

 says, " there appears to be a tendency in the four spines within the sinus of the 

 posterior abdominal segment to become double." Moore says, " the apical notch is 

 furnished with four teeth, two small ones at the base, and two larger ones outside of 

 them and at a slightly lower level. The two limbs forming the borders of the notch 

 are notched at their tips and furnished with a tuft of setae." These notches at the 

 tips are also very clearly shown in the figure given by Ives. In the Ceylon species 

 there are decidedly only two teeth within the sinus, and the tips of the sinus are 

 not notched, but carry dorsally an upright tuft of setules seemingly seated on a 

 tubercle. 



A few setules rise from the dorsal surface throughout the length of the animal. 

 There is little difference in length between the segments of the peraeon, except in 

 regard to the seventh, which is the shortest, and has its side-plates rounded, less 

 produced than the rest. The anterior division of the pleon has a transverse row of 

 five small setulose tubercles. To these succeed on the telsonic segment three longi- 

 tudinal ridges divided into tubercles, some of which carry setules. Behind the ridges 

 the segment is depressed and has a group of setules in advance of the sinus which 

 has been above described. 



The first antennae have an eight-jointed flagellum. In the second antennae one 

 member had the flagellum ten-jointed, while in the other it was seven-jointed. 



The epistome is conspicuously tri-lobed above. The distal margin of the upper lip 

 is evenly convex. 



One of the mandibles has both cutting edge and accessory plate tri-dentate. On 

 the other the dentation of these parts is obscure. They are succeeded by a bunch of 

 spines. The molar is well developed ; the palp slender, with its first joint not much 

 longer than the second or third. 



The first maxillae have the usual four feathered setae on the inner plate, the apical 

 spines of the outer plate slender. 



The maxillipeds are slightly constructed, with the last four joints apically 

 setiferous, the three preceding the terminal joint being produced into narrow lobes. 



The limbs are very similar to those of Ciliccea ivhiteleggei, but rather less robust. 

 The second peraeopod on the right side of the specimen figured has the sixth joint 

 reduced to an oval stump, carrying no finger. 



The first pleopods are remarkable for having the inner ramus twice as broad as it 

 is long, agreeing with the same appendage as described by Whitelegge for Zuzara 

 emarginata, Haswell. The second pleopods also have the inner ramus much 



G 



