402 PROCEEDINGS OP THE ACADEMY OF [1894. 



b 2 . Upper margin of rostrum serrated. 

 Cj. Carpal joint of the second pereiopoda shorter than the hand, 

 carpal joint of the first pereiopoda short. Rostrum about as 



long as the antennal scale C. brevicarpalis (1). 



c 2 . Carpal joint of the second pereiopoda longer than the hand. 

 d l . Rostrum horizontally projecting or slightly deflexed, shorter 

 than the antennal scale. 

 e v Carpal joint of the first pereiopoda short, not more than 

 1J as long as broad. 

 f x . Lower margin of rostrum serrated. 



ffi- Upper margin of rostrum with about 13-20 teeth, 



rostrum mostly longer than the first joint of the 



antennulse. 



h x . Eggs small and numerous. Fingers of the second 



pereiopoda twice as long as the palm. 



%. Carpal joint of the first pereiopoda distinctly longer 



than broad C. weberi. 



i 2 . Carpal joint of the first pereiopoda nearly as broad 



• as it is long C. japonioa. 



h 2 . Eggs greater and not numerous. Fingers of the 

 second pereiopoda but slightly longer than the palm. 



C. pareparensis. 



g 2 . Upper margin of rostrum with 3-5 teeth; rostrum as 

 long or a little longer than the first joint of the anten- 



nulse C timorensis. 



g 3 . Upper margin of rostrum with 7-12 teeth ; rostrum 

 shorter than the first joint of the antennulse. 



C. parvirostris. 



f 2 . Lower margin of rostrum not serrated. . . . C. richtersi. 



e 2 . Carpal joint of the first pereiopoda longer, at least twice 



as long as broad. 



f x . Spine at the base of the antennulse shorter than the first 



joint. 



g x . Dactylus of the fifth pereiopoda nearly half as long as 



the propodus C. Icevis. 



g 2 . Dactylus of the fifth pereiopoda very short, |-i. of the 

 propodus. 

 h x . Rostrum shorter than the stalk of the antennulae, 

 upper margin with 20-30 teeth, lower with 5-14. 



C. multidentata. 



h 2 . Rostrum about as long as the stalk of the antennulse. 

 iy. Teeth of the upper margin of rostrum 10-15, not 

 continued to the tip of rostrum, on the tip 1-2 

 teeth, on the lower margin 7-12. 



C. africana (many). 



i 2 . Teeth of the upper margin of rostrum 20-25, iu a 

 continuous series to the tip C. fossarum. 



