REPORT ON THE CRUSTACEA MACRURA. 687 



biuuguiculate dactylos. Fifth pair very long, slender, and terminating in a biunguiculatc 

 dactylos. 



Pleopoda biramose, ultimate pair subequal in length with the telson. 



Geographical Distribution. — Species of this genus have been captured in the 

 Australian seas and in the Atlantic off the Cape Verde Islands. 



Observation. — This genus is evidently the immature condition of some undeter- 

 mined form. 



Diaphoropus versipettis, n. sp. (PI. CXVII. fig. 3). 



Carapace long, cylindrical, anteriorly produced to a rostrum that is twice the length 

 of the ophthalmopod, which is short and stout. 



Peduncle of first antennas subequal with the rostrum. Scaphocerite subequal with 

 the peduncle of the first pair of antennae, flagellum (probably) long and slender. 



First pair of pereiopoda terminating in a straight and style-like unguis. Second 

 pair robust, long and chelate ; fingers about half the length of the palm, carpos short. Two 

 succeeding pairs terminating in a biuuguiculate dactylos. The fifth pair reaches beyond 

 the ophthalmopoda and terminates in a biuuguiculate dactylos. 



Length, entire, ...... 9 mm. (0-3 in.). 



„ of carapace, . . . . . 3 „ 



„ of pleon, . . . . . 6 „ 



Habitat. — Off Cape Howe, Australia, April 3, 1874. Surface, at night. 



The carapace is one-third the length of the animal and rather deeper than the walls 

 of the pleon, and has the surface smooth except for a small tubercle on the gastric 

 region ; it is anteriorly produced to a sharp rostrum lying in the plane of the dorsal 

 surface, and about half the length of the carapace. The frontal margin is excavate to 

 form orbits, the outer angles of which correspond with the first antennal tooth, whence 

 the margin recedes and unites immediately with the lateral margin, which continues in a 

 line subparallel with the dorsal surface to the posterior extremity of the carapace, the 

 lateral angles of which are rounded and increased in depth. 



The first somite of the pleon is long and divided into an anterior and a posterior 

 section. The second is still longer, being subequal with the third, fourth and fifth, 

 all of which are smooth and free from any dorsal depression. The sixth is subequal in 

 length with the preceding and with the telson. 



The ophthalmopoda are short and stout, not exceeding half the length of the rostrum 

 and about a third less broad than long. 



The first pair of antennas has the first joint of the peduncle longer than the 



