I. '08. 115 



The second pair is asymmetrical ; tiie limb oi' one side, the 

 right in the type specimen, (fig. 2) is slender, and reaches 

 beyond the apex of the antennal scale by the chela and distal 

 joint of the carpus. The ischium^ is a trifle shorter than the 

 merus and the carpus is composed of four segments, of which 

 the proximal is about three-quarters the length of the ischium 

 and mei'us combined ; the two succeeding segments are very 

 short, about as long as broad, and are flexed so as to bring the 

 distal joint — which is about twice the length of the two short 

 ones — to a position at right-angles with the proximal carpal 

 segment. The chela is slender and is rather more than half 

 the length of the merus ; the dactylus, as in the first pair, is 

 short. 



On the other side of the animal (the left in the type speci- 

 men) the leg of the second pair is of enormous length, being 

 nearly as long as the entire animal, excluding the telson. It 

 bears the huge and peculiar chela characteristic of the genus, 

 and appears under normal circumstances to be carried flexed 

 in two places — somewhat as shown in fig. 1, but with the 

 joints overlying one another in lateral view. The ischium is 

 half the length of the merus and the cai*pus, as in the leg of 

 the same pair on the other side, is composed of four joints. 

 The proximal joint is nearly as long as the merus and ischium 

 combined and bears a stout tubercle distally on its dorsal edge ; 

 the three succeeding segments are very short and about as 

 long as broad. The great chela is about one and a third times 

 the length of the carapace and is more than three times as 

 long as broad. It bears a close resemblance to that of the type 

 species — figs. 10 and 11 will probably convey a better idea of 

 its peculiar appearance than a long description. The superior 

 margin of the propodus is very thin and reflected upwards and 

 outwards, leaving a deep groove between its elevated edge and 

 the thick lower portion. From an extra deep area of this groove 

 a thin walled sausage -shaped structure rises ; in one case this 

 gives the appearance shown in fig. 10, but in no two specimens 

 is it exactly alike. In one instance it seems to consist of an 

 inflated membrane which rises above the level of the other 

 parts of the chela (fig. 11) ; it is possible that this is the normal 

 form of the structure, while in the other two specimens it is 

 torn. On the lower side of this a row of small papillae may 

 be seen and w^hen the limb is completely flexed these papillae 

 appear to come in contact with a similar row on the inferior 

 margin of the merus (see fig. 1 and enlarged view in fig. 3). If 

 these had been of a stouter build it would have seemed pos- 

 sible that they were provided to link the joints of this un- 

 wieldy limb together, when not in use, but their structure is 

 so essentially weak that they could hardly serve this purpose. 



The third , fourth and fifth pairs of pereiopods are of about 

 equal length and are longer than the rostrum and carapace 

 combined. The ischium is rather more than half the length 



1 Stebbing's figure of this limb in L, PauJsoni is perhaps erroneous 

 in respect of the proportional lengths of the basus and ischium. 



H 2 



