NO. 2 MUD SHRIMPS SCHMITT I3 



visible in the only other specimen of the typical species at hand, also 

 from Montego Bay, Jamaica. 



The major right cheliped does not differ much from that in the 

 typical species in the proportions of its joints and their armature ex- 

 cept in the fingers ; merus and carpus about subequal, measured on their 

 upper borders ; merus about twice as long as its median width ; fixed 

 finger from hind end of sinus between the fingers is one-half the 

 length of the palm measured back from the same point. The fixed 

 finger is short and strong and ends in a stout, conical, up-turned ex- 

 tremity and has a strong, blunt, tuberculiform tooth situated at about 

 one-third the length of the finger from the back of the sinus between 

 the fingers to the tip. The movable finger had the tip broken ofif before 

 capture and may have lost from a tenth to a fifth of its length, the part 

 remaining slightly exceeding in length the fixed finger. On the cutting 

 edge it is provided with two teeth, a stout conical one near the base 

 of the finger tending to fit into a notch at the upper end of the base 

 of the sinus between the fingers, and an anterior longitudinally elon- 

 gated laminate tooth ; these teeth are so spaced that the tooth on the 

 fixed finger bites between them, while the tip of the fixed finger closes 

 in advance of the laminate tooth of the movable finger ; on the upper 

 margin of the movable finger is a single blunt tubercle, more con- 

 spicuous than either of the tubercles similarly placed in the type of the 

 species ; also in the variety the finger is smooth above and not eroded 

 toward the articulation ; in the second of the typical specimens the 

 finger, again, is eroded and the tubercle inconspicuous. 



Near the hinder end of the carina forming the posterior two-thirds 

 of the upper border of the palm there is a brief emargination, followed 

 by a small tooth ; that this efifect may have been brought about by an 

 injury is possible ; the conspicuous carina on the outer face of the palm 

 of the type of the species is here represented by an inconspicuous 

 impressed line perhaps two-sevenths the length of the palm in line 

 behind it ; no depressed area is evident above this line. 



The antero-inferior angle of the carpus shows two tiny tuberculi- 

 form projections, one either side of a hair tuft at that angle. 



The ventral margin of the merus, other than the two-spined lobe at 

 the posterior end, as in the type of the species, is unarmed except for 

 three compressed teeth near the anterior end of the middle third of 

 the margin ; the merus of the smaller of the two typical specimens 

 closely resembles that of the varietal form, though it has five teeth in 

 place of the three just mentioned. Posteriorly, the upper margin of 

 the merus has a shallow emargination in place of the very definite 

 notch found in the typical specimens. The tooth at the anterior end of 



