H. Richardson — Isopods of the Bermudas. 28*i 



Colanthura Richardson, gen nov. 



Body narrow, elongate. First pair of antennae composed of four 

 joints, the last joint being the flagellar joint. Second pair of antenna? 

 composed of five joints, the terminal joint fringed with hairs. 



The first six segments of the thorax large, the seventh very short, 

 abruptly narrower than the sixth, not as wide as the abdominal 

 segments and devoid of legs. 



The first three pairs of legs are sub-chelate, the three following 

 pairs ambulatory. 



The abdominal segments are well defined and distinct from one 

 another. The terminal abdominal segment is rounded, entire. The 

 inner branch of the uropoda is likewise rounded; the outer and 

 superior branch arches over the telson. 



This genus agrees with both Hyssura Norman and Stebbing and 

 Cruregans Chilton in the absence of the seventh pair of legs, but 

 differs from the first named in the structure of the antenme, both 

 pairs of antenna? in Hyssura having multi-articulate flagella; in the 

 structure of the outer branch of the uropoda, which in Hyssura does 

 not arch over the telson; and in the structure of the mouth parts. 

 Colanthura differs from Cruregans in the presence of eyes, Avhich 

 are wanting in Cruregans, and in the structure of the outer branch 

 of the uropoda, the outer branch in Cruregans being very narrow 

 and not arching over the scpiamiform telson, while in Colanthura 

 the outer branch is broad and arches over the rounded terminal seg- 

 ment. The structure of the mouth parts is the same as found in the 

 genera Paranthura, Calathwa and Cruregans. 



Colanthura tenuis Richardson, sp. nov. 



Plate XXXVIII. Figures 23-28. 



Body narrow, elongate; surface smooth; color light yellow. Head 

 with a prominent median process extending between the first pair of 

 antennae. Antero-lateral angles prominent, produced, reaching the 

 distal end of the first joint of the peduncle of the first pair of antenna?. 

 Eyes large, conspicuous. 



First pair of antenna? consist of four joints, the terminal or flagellar 

 joint being fringed with long hairs. The second pair of antenna? 

 are composed of five joints, the terminal joint being fringed with 

 hairs. 



The first three thoracic segments are about equal in length. The 

 fourth and fifth segments are each much longer than any of the 



