NO. 2 MUD SHRIMPS SCHMITT 7 



prominent blunt tooth, and anterior to it, with two blunt denticles; 

 distally on the outer, upper border of the terminal hook of the movable 

 finger there is a conspicuous blunt right-angled tooth topped with a 

 thick tuft of hair. This upper, outer tooth on the movable finger makes 

 the digit appear terminally bifurcate; the tooth seems to be a feature 

 characteristic of this species alone ; on the upper margin near the base 

 of the tooth is a blunt tuberculiform tooth, and beginning a little 

 distance behind this on the inner side of the upper margin of the finger, 

 a row of low tubercles, about seven in the type ; they seem not to be 

 developed in smaller specimens ; the fixed finger arises some distance — 

 about half its length — behind the distal margin of the palm and forms 

 with the forward projection of the palm a deep sinus ; the fingers, 

 when closed, have a large gape between them, half of which is formed 

 by the sinus just described ; the terminal portion of the movable finger 

 closes or hooks outside the tip of the fixed finger. 



The smaller cheliped, as compared to the larger, is slight and thin, 

 carpus and propodus together being noticeably shorter than the carpus 

 alone of the larger cheliped; the ischium is fairly straight, unarmed, 

 thin, and flat, a little longer than the merus, shorter than the carpus, 

 and a little shorter than the chela to the tips of the fingers when closed ; 

 from its hinder border the carpus narrows anteriorly in lateral aspect, 

 likewise the hand to the tips of the fingers ; measured to the tip of the 

 extended movable finger, the hand and carpus are subequal ; measured 

 at the middle of its length, the width of the carpus is contained twice 

 in the length of its upper border; the palm, measured from the base 

 of the sinus between the fingers, is longer Aan wide and longer than 

 the fixed finger measured from the same point, but equal to the 

 movable finger ; all joints of the cheliped are smooth and shining ; 

 merus and carpus hairy on lower margins, palm thickly so on both 

 margins, fingers on outer surface face adjacent to prehensile edges 

 provided with a thick felt or pad of hairs ; prehensile edge of either 

 finger denticulated, armed with about 15 small, sharp, triangular teeth, 

 of which the most anterior are rather small ; distal fourth of either 

 prehensile edge or margin more or less without teeth. 



The inner face of the ischium of the third maxilliped (pi. 3, fig. 2) 

 shows a short crescentic row of tiny granulations, scarcely to be ob- 

 served with a glass in a wet specimen ; continuing the curve of the 

 crescent formed by not over a dozen of these granulations is a slight 

 ridge, set ofl:' by no more than an incised line beside it, which extends 

 about three-fourths the length of the joint. 



The abdomen is soft, broad, and depressed ; the first two somites are 

 dorsally thin and membranous, the others are thicker and tougher, 



