REPORT ON THE (Kt'STACKA MACKI'ItA. (i<) 



with the anterior margin of the post-cardiac sulcus; the lateral longitudinal ritlges are 

 conspicuous but not very elevated, they are anteriorly smooth and posteriorly tuberculose, 



and except for the cervical depression, are continuous from the inner cantlms of the orbits 

 to the posterior margin of the carapace. The anterior extra-orbital angles are prominent 

 and project considerably beyond the orbits, and the lateral margin of the carapace is 

 divided by two depressions, the anterior corresponding to the cervical sulcus, the other 

 posterior to it. The carapace generally is ornamented by a number of low tubercular 

 prominences most abundant on the branchial, sub-hepatic and gastric regions ; on the 

 cardiac border they are regular and closely packed, while on the post-cardiac margins 

 they are smaller and more regularly distributed; along the branchial regions they corres- 

 pond in a line with the upper and lower margins, and disappear altogether on the lower 

 or inflected surface. 



The pleon is also tuberculated, the tubercles running transversely on each somite, 

 from the median ridge to the coxal plates, in two parallel lines, and are generally 

 smaller than the tubercles on the carapace. 



The eyes are considerably within the lateral margins of the carapace. 



The first joint of the first pair of antennae reaches to the extremity of the second joint 

 of the second pair, and has its base rather largely developed; the second joint reaches to 

 the extremity of the terminal joint of the second pair, whhe the third is but little shorter 

 than the preceding joint. 



The second pair of antennas has the fourth or anterior joint adorned with five cusps 

 on the anterior margin, and a smaller on the internal, all of which are thickly fringed 

 with hair. The first joint is narrow ; the second has two large, and one or two less 

 conspicuous teeth on the outer margin, and four or five small teeth on the anterior 

 margin; the diagonal ridge is slightly curved and projects as ^far as, if not slightly 

 beyond, the extremity of the most anterior cusp of the anterior joint ; the whole surface 

 being covered with a thick pilose fur. The ventral surface of the pereion is sparsely 

 covered with short fur. 



The first pah- of pereiopoda is short, robust, and simple, adorned with a row of hairs 

 along the upper and lower margins of the propodos. 



The second pair is longer than the first, and has the propodos broad and fiat; 

 the upper surface is adorned with a row of hairs, as is also the lower margin ; while on 

 the latter the hairs continue along the same margin to the extremity of the basis. 



The third pah- of pereiopoda has the propodos broader and longer than the second, 

 and is fringed with hairs on the upper and lower margins, as is also the upper margin of 

 the dactylos on the inner and outer sides. 



The fourth pah of pereiopoda is slender and longer than the third pair, having the 

 dactylos very long and furred with long hairs on the upper margin. 



The fifth or posterior pair is shorter than the fourth, equally slender, and terminates 



