REPORT ON THE AMPHIPODA. 1555 



Telson longer than broad, with gently convex sides and a broadly rounded apex, 

 so that it has nothing of the triangular appearance presented by many other species of 

 the genus. 



Length, one-fifth of an inch. 



Locality. — October 1875, South Pacific; surface. One specimen, male. 



Remarks. — The specific name is given out of respect to Professor Bovallius. Brachy- 

 scelus rapax (Glaus), from the Cape of Good Hope, is said to have the third joint of the 

 fourth perseopods not pectinate, and the first joint of the fifth perseopods equal in length 

 to the remaining joints together ; the peduncles of the first pair of uropods are described 

 as little longer than the rami, but figured a little shorter ; the length of the specimen 

 described is given as about two-fifths of an inch, whereas the Challenger specimen, also 

 an adult male, is only one-fifth of an inch long. Brachyscelus latipes, above described, 

 which agrees with the present species in regard to the telson and more or less in regard 

 to the uropods, is very different in the third and fourth perseopods. The present 

 species is in some respects a connecting link between the genera Brachyscelus and 

 Thamneus. 



Brachyscelus acuticaudatus, n. sp. (PI. CXCVIL, G). 



Back of peraeon rounded, a little compressed laterally, side-plates small and shallow ; 

 first three pleon-segments with the sides angled. 



Eyes occupying almost all the surface of the head, leaving free a small strip at the 

 base ; the upper division of the eye much smaller than the lower front one, closely 

 contiguous to it ; dorsally the head has a small space free where the four ocular divisions 

 approach one another. 



Upper Antennae (of the female) forming a single bend, the first joint of the 

 peduncle nearly three times as long as the second joint ; the first of the flagellum as 

 long as the first of the peduncle, with five groups of filaments on the slightly narrow 

 distal half ; the second joint narrow, not half the length of the first ; the following 

 joint broken off. 



First Gnathopods. — The first joint straight, channelled in front ; the short second 

 joint with a strong brush of spines on the hinder distal margin ; the wrist with seven 

 teeth on either side above the tooth of the apical process ; the hand with eight teeth 

 on the hinder margin and one on the distal margin. 



Second Gnathopods. — The wrist process with six teeth on the hind margin and 

 nine on the front or inner margin ; the hand with six teeth on the hinder and one on 

 the distal margin. 



First and Second Perseopods. — Only the fifth joint pectinate. 



