796 



THE VOYAGE OF H.M.S. CHALLENGES. 



The telson is shorter than the branches of the rhipidura, dorsally flanked on each side 

 within the margins by two distant small spines, and a long and a short one on the 

 margin on each side of the terminal extremity. 



Habitat. — Bermuda, shallow water. 



The carapace is nearly one-third the length of the animal ; the frontal region is crested 

 and anteriorly produced to a rostrum that is about two-thirds the length of the carapace, 

 and armed on the upper margin with seven large teeth, of which the most anterior is the 

 smallest and stands near the apex, and the posterior is situated above the pyloric region. 

 The frontal margin has the orbital notch traversed by a lunate lacuna, and the canthus 

 is situated inside of the first antennal tooth, which in this species is well defined by a 

 slight projection ; behind and a little beneath stands the hepatic tooth, which is the 

 only other tooth on the frontal surface of the carapace, the fronto-lateral margin sloping 

 away from the lower portion of the second pair of antennae. 



The pleon is dorsally rounded and laterally compressed, the third somite is longer 

 than the second and longitudinally arcuate ; the sixth somite is but slightly longer than 

 the fifth, which is shorter than the fourth. 



The ophthalmopoda are short and stout and the ophthalmus is large, ovate, laterally 

 compressed, and furnished with an ocellus within its posterior margin. 



The first pair of antennae has the first joint of the peduncle nearly twice as long as the 

 second and third together, excavate on the upper surface, laterally extended, and of great 

 tenuity ; it is armed near the base with a short flat stylocerite that reaches to less than half 

 the length of the joint, and furnished at the outer distal angle with a strong, flat, sharp 

 tooth. The second and third joints are short, cylindrical, and terminally support two 

 flagella, the inner of which is very slender, and the outer stout at the base, and continuing 

 a distance nearly equal to the length of the peduncle before sending off the secondary 

 ramus. Beyond the point of bifurcation, the two rami are slender and thread-like ; length 

 undetermined. 



The second pair of antennae supports a strong scaphocerite that reaches beyond the 

 extremity of the rostrum, and carries a long and slender flagellum that is about half the 

 length of the animal. 



