14 MR. E. J. MIERS ON [Jail. 15, 



of the Brititish Museum {E. W. H. Holdsworth, Esq.), but simple, 

 flattened and compressed, articulated with the preceding joint in 

 the middle of its dorsal margin, and with the terminal joint at its 

 distal extremity (see the figure). 



The carapace, as usual in the genus, is laterally compressed, with 

 the cervical suture strongly defined, the rostrum trispinose, the 

 lateral a little shorter than the median spines. Of the segments of 

 the postabdomeii, the first, second, and sixtli are longest, the sixth 

 about as long as the two preceding segments taken together, whereas 

 in the specimen referred to C. tridentata in the Museum Collection 

 the sixth segment but little exceeds the fifth in length. The 

 terminal segment is small, slightly transverse, and subtruncated at 

 its distal extremity. The eyes project very sliglitly beyond the 

 median spine of the rostrum and are bluntly pointed at their 

 inner and distal angles ; the corneae are small and placed on the 

 dorsal surface of the peduncles. The antennules are less than half 

 the length of the antennse ; the terminal joint of the peduncle very 

 slightly exceeds the penultimate joint in length ; the inferior of the 

 two fiagella is fringed with long hair on its lower margin. The 

 antennae are about twice the length of the carapace ; the antepen- 

 ultimate peduncular joints bear a small spinule at the distal extremity 

 on the outer margin ; the penultimate and terminal joints are sub- 

 equal. The left chelipede is the larger ; the merus-joint is less than 

 twice as long as broad, and its inferior margin is acute and serrated, 

 but without strongly developed teeth or spines. The carpus is rather 

 shorter than, but as broad as, the palm, smooth, its inferior margin 

 acute and entire ; palm rather longer than broad, smooth and 

 polished, with the upper and lower margins fringed with hair, the 

 lower margin acute ; several tufts of setw occur on its outer surface 

 near to the base of the fingers, which are shorter than the palm, 

 with the tips incurved ; the uppermost arcuated, with the inner 

 margin acute and entire, the lowermost with a small tooth or lobe 

 on the inner margin, both clothed on their outer surface with 

 several tufts of hair. In the smaller chelipede the joints are all 

 much slenderer, and the merus-joint is not serrated on its inferior 

 margin. The third legs have the antepenultimate joint armed with 

 a low triangular lobe on the inferior margin ; the produced posterior 

 lobe of the hairy penultimate joint is broad and obtuse ; the dac- 

 tylus small, hairy, and subacute. 



lines. millim. 



cJ . Length of the body, nearly 22 46 



Length of larger chelipede, nearly. ... 1 2 ^ 26 



In the specimen in the Museum Collection referred to C. triden- 

 tata, V. Martens, there is a strong tooth or lobe at the proximal end 

 of the inferior margin of the merus of the larger chelipede. Nothing 

 is said as to the existence of this lobe by v. Martens : but Milne- 

 Edwards, in his monographic revision of the genus CalUanassa ', 

 describes C. tridentata as having the merus unarmed. 



' Nouvelles Areliives du Museum, v. p. 101 (l86ft)- 



