GLOSSOCEPHALUS. 105 



Gen. 9. Glossocephalus, C. BOVALLIUS, 1887. 



Derivatio: yAcoffo'a = the tongue, and xsyakog = a large-headed fish. 



Diaqn. The head is comparatively short and broad, and produced 



into a broad rostrum, which is rounded in front. The under 



side of the rostrum is open. The hind part of the head 



is constricted. 

 The second pair of antennae are hidden under the head, when 



folded, and, to a small extent, under the peraeon. 

 The first two pairs of perceopoda are cheliform. The carpus 



and metacarpus of the fifth pair are much dilated. 

 The last coalesced ural segment is longer than, but not twice 



as long as, the first, and is only a little longer than broad. 

 The inner rami of all the three pairs of uropoda are free, 



not coalesced with the corresponding peduncles. 

 The telson is short, and tongue-shaped. 



Syn. 1887. Glossoeephalus, C. BOVALLTOS. 35, p. 35. 



This genus is most easily distinguished from all the other genera 

 of the family by the much dilated tibia, carpus, and metacarpus of the 

 fifth pair of perseopoda, and also by the wide, almost cup-shaped carpus 

 of the first two pairs. The dilated form of the joints of the fifth pair 

 strikingly recall that feature in the sixth pair of Phorcorhaphis, STEBBING, 

 and Lycceopsis, GLAUS. 



The genus contains hitherto two species: 



A. The hind margin of the metacarpus of the first pair 



of perseopoda is smooth. The seventh pair are 



longer than the femur of the sixth. 1. Cr. Milne-Edwardsi. 



B. The hind margin of the metacarpus of the first pair 



of perseopoda is armed with a strong tooth. The 



seventh pair are shorter than the femur of the sixth. 2. Gr. spiniger. 



Nova Acta Reg. Soc. Sc. Ups. Ser. III. H 



