54 Carl Bovallius, The Oxycephalids. 



The rami of the first pair of iiropoda (p. 39, fig. 76) are elongate- 

 lanceolate. The outer ramus of the second pair is narrowly elongate; 

 the inner is broadly lanceolate, and more than twice as broad as, but 

 only a little longer than, the outer. The inner ramus of the third pair 

 is falciform, sharp-pointed. 



CoLOTJU. Light red, without spots. 



Length. .5 — 6 mm. 



Hab. The tropical region of the Atlantic. 



Gen. 2. Oxyceplialus, H. Milne Edwards, 1830. 



Diagn. The head is elongated, and produced into a moderately long rost- 

 rum, which is more or less sharp-pointed, and is open on the 

 under side. The hind part of the head is only feebly constricted. 



The second pair of antennœ are, when folded, hidden under 

 the head. 



The first two pairs of perœopoda are cheliform. The carpus 

 and metacarpus of the fifth pair are not dilated. 



The last coalesced ural segment is about twice as long as the 

 first, but is not twice, as long as broad. 



The inner rami of the last two pairs of urojioda are coalesced 

 with the corresponding peduncles. 



The telson is broad and triangular, with the sides more or 

 less curved. 



S^/n. 1830. Oxycephalus, H. Milne Edwards. " 1, p. 396. 



), » H. Milne Edwards. 1840. 7, p. 99. 



» » C. Spence Bate. 



» » C. Claus. 



» » C. Bovallius. 



» » C. Claus. 



» » Th. Stebbing. 



1832. Orio, A. Cocco. 



1850. Ornithorainphus, G. Natale. 



186i. Natalius, A. Costa. 



Instead of tracing the history of the genus and the various spe- 

 cies assigned to it, the most important facts of which are briefly given 

 above in the historical introduction, I only give here a list of all the spe- 

 cies adding to them the names which I believe to be their true names, 

 that is to say those under which they are recorded in this treatise. 



