216 Prof. J. Ji. Uenlersoii on a 



extends from side to side, the median portion of which 

 lodges the antennules, which are incompletely separated hy 

 a ])r()jecting median spine springing from the epistome, 

 "while the outer portions represent the orbits. The orbit, 

 as now seen, is a cavity with somewhat rounded outline, 

 continuous internally with the space or fossette in w^hich 

 the antennule is lodged ; the upper orbital margin is the 

 rounded indentation between the submedian and outer 

 lobe on the frontal margin of the carapace ; the posterior 

 and lower margin is formed by the notch in the pterygo- 

 stomial edge already referred to, and terminates in the 

 pointed pterygostomial angle or spine which lies immediately 

 external to the basal antennal joint. The eyes, as already 

 indicated, are not completely retractile into these orbits, for 

 when viewed from below a large portion of their stalks is 

 always visible. The antennular fossettes are continuous, 

 and a separation is only faintly indicated by the median 

 epistomial spine. 



The epistome, which is not sharply demarcated from the 

 palate, appears somewhat deeply excavated, owing to the 

 prominence of the pterygostomial angles. The external or 

 third maxillipedes are separated by a considerable median 

 space, in the upper part of which the mandibles are partly 

 exposed ; the ischium is broad and suboperculiform, pro- 

 duced internally into a rounded lobe which extends well 

 beyond the insertion of the merus ; the merus is greatly 

 reduced in size, being even slightly shorter though a little 

 broader than the carpus, and it springs from a notch at the 

 antero-external angle of the ischium. The exopod of the 

 external maxillipedes is not visible in its usual position at 

 the outer side of the appendage, and in more than one 

 specimen no trace of it could be found ; in one preparation, 

 however, a minute tilament was found concealed behind the 

 coxal joint, which probably represents the missing exopod. 

 The first and second pairs of maxillipedes are normal, with 

 well-developed exopods. 



The clielipcdes and an)bulatory legs are (>f moderate length, 

 with a few spinules on the upper surface of the merai and 

 carpal joints. The cheli pedes are slightly longer than the 

 first pair of ambulatory legs, as a result of the lengthening 

 out of the four terminal joints ; the propodus is more slender 

 than the carpus, and its i)almar jjortion is about one fourth 

 longer than the dactylus ; the fingers are slender, acutely 

 pointed, and distinctly incurved. Tiie ambulatory legs are 

 moderately stout,, and there is no su(;li special diminution in 

 thickness of their propodi as is noticeable in the chelipedes. 

 The legs gradually diminish in size on passing backwards, 



