594 CRUSTACEA. 



Length, about two inches. Colour, a light pink, with large purple 

 spots generally bordered by yellow; several of these spots on the folia- 

 ceous hand. The carapax curves inward below, so as to cover the 

 space quite to the exterior maxillipeds ; there is a spine on the cara- 

 pax just below the eye. Caudal segment oblong tapering; a few short 

 hairs at apex and two spines either side. Caudal lamellae rounded at 

 apex and furnished with short hairs; the outer two-jointed. Eyes on 

 oblong cylindrical pedicels. Outer maxillipeds cover closely the 

 mouth, the first three joints of the two lying in contact; the following 

 portion, which is foliaceous, is bent downward. The second joint is 

 subcylindrical ; the third is widened outwardly into a broad trape- 

 zoidal joint, broadest below, which in under view conceals from sight 

 the base of the outer antennae. The foliaceous portion has a small 

 lamellar joint at apex. Legs all naked. The hand of the first pair is 

 slender subulate, and the finger is not more than one-eighth of the 

 hand in length. Foliaceous hand of second pair membranous, except- 

 ing outer margin. Finger about one-third the length of the hand. The 

 carpus is much shorter than the finger, and has two acute teeth at 

 apex ; the arm is two-thirds as long as the hand, and has two teeth 

 at apex. The following feet are slender and similar, the third pair 

 is the shortest, the fifth the longest. The claw is very short and 

 minute. 



Genus CRYPHIOPS, Dana. 



Oculi sub carapace profunde celati. Rostrum et carapax uti in Pontonia. 

 Antennas interna^ flagellis tribus confectce. Mandibula? palpo 3-arti- 

 culato instructce. Maxillipedes externi subtenues, longitudine me- 

 diocres. 



Eyes concealed deeply under the carapax. Beak and carapax as in 

 Pontonia. Inner antennae with three flagella. Mandibles having 

 a three-jointed palpus. Outer maxillipeds rather slender, of medium 

 length. 



This genus is the only one, hitherto discovered among the Palae- 

 moninae, in which the eyes are concealed under the carapax. They 

 are much more deeply covered than in Alpheus, and the carapax has 

 no swelling above, and no translucency ; so that the animal can only 



