REPORT ON THE CRUSTACEA MACRURA. 147 



The dental armature of the carapace may for convenience be formulated as — 



Marginal, .... 10—3—14 



Dorsal ridge, . . . . 2M1111 111— 111M-M11 



The pleon is smooth and carinated in the median line ; the carina in the three 

 anterior somites culminates into anteriorly-directed teeth. 



The first pair of pereiopoda has the meros smooth on the outer margin, with a 

 strong tooth at the external carpal angle, and armed on the inner margin with several 

 small teeth, of which in our specimen four are well defined. 



Length (female), 60 mm. (2 - 25 in.). 



Habitat. — Station 174c, August 3, 1874 ; lat. 19° 7' 50" S., long. 178° 19' 35" E.; 

 off Kandavu Island ; depth, 610 fathoms; bottom, coral mud; bottom temperature, 39°. 

 One specimen. 



This species is of a very beautiful and graceful form. The lateral margins are 

 slightly curved outwards, and the carapace possesses a somewhat ovate shape. The 

 teeth on the lateral margins of the carapace are very even and regular, with a tendency 

 to diminish gradually in size as they approach the posterior margin. The tooth at the 

 anterior angle of the carapace is very strong and prominent, and projects beyond the 

 line of the median or rostral teeth. There is a sharp and prominent tooth on the inner 

 and outer angles of the orbital notch. There is a single row of many teeth in the 

 median line. Several of the anterior are well defined, but posteriorly they diminish, and 

 become mere protuberances. 



The internal margin of the branchial region is defined by a wavy, baccated line, 

 separating the branchial from the cardiac region. 



The posterior margin of the carapace is smooth and free from armature, and is over- 

 lapped by the lateral extremity of the first somite of the pleon. 



The first somite of the pleon is very short and narrower than the carapace. The 

 anterior half is depressed, and slides under the carapace when the animal is extended. 

 The posterior half is elevated, armed in the median line with a strong, sharp, anteriorly- 

 directed tooth, and fringed along the posterior margin with a row of fine cdia. The 

 lateral extremity consists of the coxal plate reduced to a strong calcified mass that 

 is curved forwards, and, as a pleocleis, overlaps and holds down the posterior margin of 

 the carapace. 



The second somite is longer and slightly narrower than the first, articulating with it 

 at each lateral extremity by a small ball-and-socket joint, beyond which the coxal plates 

 are large, and project downwards and extend forwards to the margin of the carapace, 

 and posteriorly overlap the anterior half of the coxal plate of the third somite ; a well- 

 defined fossa passes obliquely from the postero -lateral angle of the somite to the central 

 line of the posterior or elevated portion, where it is armed with a strong, sharp and 



