REPORT ON THE CRUSTACEA MACRURA. 151 



curved hair. The lateral margins of the carapace are very nearly parallel ; anteriorly 

 they converge slightly towards each other, and the anterior angle is produced slightly in 

 advance of the anterior margin. The lateral margins are furnished with well-defined teeth 

 throughout their entire length, the several divisions being well marked ; the anterior, which 

 is turned somewhat abruptly upwards, has eight teeth including the anterior angle ; the 

 second or central division has four or five. There were four on each side in one specimen, 

 and four on one side and five on the other in another, so that there is a tendency to 

 variation. The posterior has thirteen teeth. The anterior or frontal margin between the 

 orbits is convex, and armed with two rostral teeth, one on each side of the median 

 ridge ; four or five small denticles arm the frontal margin between the rostral teeth, 

 and two larger ones behind and above the first pair of antennae, outside which are two 

 other small denticles, then a tolerably large one is situated within the margin at the 

 inner angle of the orbital notch, the outer margin of which as far as the extremity 

 of the latero-anterior angle of the carapace being smooth. Thelongitudinal median 

 ridge is furnished with a double row of small bead-like granulations, and also, at some 

 distance behind the rostral teeth, with a single tooth, a little behind it with another, then 

 two side by side, then a single one anterior to the cervical fossa, behind which the double 

 baccated row still continues to the posterior margin, and is armed close behind the cervical 

 fossa with two teeth side by side, and at about one-third of the length of the ridge with 

 two more similarly arranged in the female, but without any in the male. On the anterior 

 edge of a ridge along the posterior margin of the carapace, on each side of the median 

 line, is one sharp, strong, obliquely and anteriorly directed tooth ; at a little distance is a 

 second, and then a third, but the two latter are smaller and less important. The first 

 somite of the pleon has a small, central, anteriorly-directed tooth, and on the anterior 

 margin, just within the peltecleis, is another small and slender tooth ; outside the peltecleis 

 the marginal extremity of the somite terminates in a rounded protuberance fringed 

 with cilia, that overlaps the postero-lateral angle of the carapace. The second somite of 

 the pleon is armed in the centre with a tooth a little larger than that of the preceding ; 

 the rest of the somite is smooth and polished, as is also the coxal plate at the sides. 

 The two succeeding somites resemble the second, nor are any of the central teeth more 

 important ; that on the fifth is less so, and is little more than a cusp, while on the sixth 

 somite the slightest indication of a carina only exists at the posterior margin, and on the 

 telson there is a small bead-like cusp near the anterior margin. 



The ophthalmopod is lodged in a notch in the carapace that is much broader at 

 the anterior margin, and narrows posteriorly ; it carries a small, pointed cusp on the 

 anterior surface, and passes outwards beneath the projecting angle of the carapace, 

 and terminates in two small nodules, one on the outer, the other on the lower 

 side. 



The first pair of antenna} (C, b) has the squamose process of the first joint produced 



