REPORT ON THE CRUSTACEA MACRURA. 



883 



Habitat. — Cape Verde, April 26, 187G. 



Tribe Haplopodea. 



This tribe is established to receive all those genera in which the pereiopoda are 

 simple and resemble each other, none of them being chelate or having the carpos multi- 

 articulate. 



The tribe may be divided into separate families according to the structure and 

 development. 



Family Hectakthkopidj. 



This family is established to receive those Macrura that have all the pereiopoda 

 similar in structure to each other, consist of six joints only, and in which every limb 

 except the last supports a basecphysis. 



Procletes, 1 n. gen. 



Animal rigid. Carapace about one-third the length of the animal, anteriorly pro- 

 duced to a long rostrum, which is serrate on the upper and lower margins. The frontal 

 margin is armed with a supraorbital and a small orbital tooth, another tooth corre- 

 sponding with the second antennas, and one at the fronto-lateral angle. 



The pleon is dorsally carinated and armed with teeth ; the sixth somite is subequal 

 with the fifth and the telson, which is tapering. 



The first pair of antennae is biramose. 



The second pair of antennae has a scaphocerite that has the outer margin rigid and 

 distally armed with a tooth. 



The gnathopoda and pereiopoda are six-jointed, pediform, not chelate, and furnished 

 with a basecphysis, except the posterior pair. 



The sixth pair of pleopoda has the rami subecmal and foliaceous. 



Geographical Distribution. — Only two species of the genus have been observed. 

 The first was taken by the late Sir Walter Elliot at Waltair, on the coast of Coromandel, 



1 ^oK^nrns, "Challenger." 



