A.MPHIPODA. 271 



1st joint subequaJ in Length and width to the hand, which is rather Longer than the 

 wrist, front and hind margins subparallel, slightly convex ; palm oblique, well 

 defined, uneven and setose (fig. 28. gn. s $ ). 



First and 2nd perseopods : 1st joint widening abruptly. Dactylus strong, with a 

 secondary tooth on the outside and a short spine on the inside (fig. 28. pp. 1 ). 



Third perseopods : 1st joint oblong and subequal in Length to the 5th. 



Fourth and 5th perseopods much more powerful than the 3rd, and reaching 

 backwards much beyond the ends of the uropods; the joints spinous. All the 

 perseopods have the secondary tooth on the dactylus. 



First uropods extending a little beyond the 2nd, slender; peduncles and rami 

 subequal, spinous; 2nd pair resembling the 1st. 



Third uropods with the outer ramus about twice as long as the peduncle, with 

 3 "whorls" of spines between the base and the extremity; inner ramus quite 

 rudimentary. 



Telson not unlike that of M. palmata (Mont.), hut the divisions are sharply pointed 

 without terminal spines, hut with a long upright one at the angle on the inner side, 

 and a horizontal one between it and the point. 



Length 5 inillims. 



The male lias been described and figured by Dr. Giles (Inc. cit.). It is remarkable 

 lor thi' Large size and peculiar form and colouring of one of the 2nd gnathopods. I 

 think there can be little doubt, from its resemblance to a hit of broken shell, that its 

 use is protective, the animal covering itself with it as it lies partly buried in the sand. 

 Dr. Herdman informs me that he has seen them in this position. 



Maera, Leach, 1813. 



Maera othonides, n. sp. Plate V., figs. 29. 



Stations V., LIIL, LXIV., Cheval Paar. 



Very near .1/. othonis (M. Edwards), from which it differs as follows: 



The ocular lobe is rounded. 



The 3rd pleon segment has no teeth on its lower and from 1 to 3 teeth on the hind 

 margin (fig. 29. pi. 3 ). 



The appendage of the upper antennae is ^-jointed. 



The palp of the mandibles has the 3rd joint considerably shorter than the '2nd. 



The side-plates of the gnathopods are not serrated, below ; there is a single tooth at 

 the posterior angle of the 1st pair. In the baud of the 2nd pair in the female the 

 palm is concave. 



The 3rd uropods have their ends truncate with a group of spines (fig. 29. up. 3 ). 



The telson has a second notch above the terminal one on the inside of each division 

 (fig. 29. t.). 



Length 8 millims. 



