0XTCF,1M1AI,IP,T5. 345 



rami long, lanceolate. Telson cylindrical (broken), reaching; pro- 

 bably (luite to the extremity of the ultimate pair of pleopoda. 

 Lenfj^th 4^ inches. 



Hah. Taken dimng a calm, lloating on the .surface of the S(juth 

 Atlantic ( Vice- Admiral Sir Edward Belcher). Found by MM. Quoy 

 and (iaimard in the sea between Aniboyna and Van Diemen's Land 

 {Edifards). 



The specimen figured is a female, canying many ova. Tt was pre- 

 sented ])y Vice-Admiral Sir E. liekher to the Huntcrian Museum of 

 the College of Siu'geons, to the Council of which I am indebted for its 

 loan. 



M. Guerin-3ilene\'ille was so kind as to show me the di-awing of 

 a speiimen in his collection, which appeared to be of this species, 

 from which he had procured some young animals. Without having 

 had the opportunity of examining the specimen, I may remark, that 

 the young ai)2)roximatc in form to that of Oxi/cepJiaha^, showing that 

 the long rostrum is developed with the growth of the animal. 



2. Rhahdosoma Whitei. (Plate LIV. fig. 7.) 



3Iale. — Cephalon about two-thirds the length of the animal ; rostnim 

 from the superior antennae as long again as the rest of the cephalon. 

 Sixth segment of the pleon not longer than the preceding. Superior 

 antenna} curved downwards ; the inferior convex margin thickly 

 covered with hairs. Inferior antenna) cyliuchical, slender, pro- 

 bably reaching, when extended, as far as the extremity of the 

 rostrum ; first joint reaching as far as the eyes ; second as long as 

 the fii'st ; third as long as the second (rest wanting) ; each joint 

 is bent back against the preceding, and the whole, when at rest, 

 are enclosed within an elongated groove on the under margin of 

 the cephalon. Mandibles ha\ing the appendage long ; fii-st joint 

 nearly as long as the first joint of the antenna?, second and third 

 short. First pair of gnathopoda havi:ig the coxa anteriorly i)ro- 

 duced to an obtiLse point ; carpus broadly infero-antcriorly pro- 

 duced as far as the inferior angle of the propodos ; projiodos short, 

 stout, inferior angle anteriorly produced ; dactylos long, arcuate, 

 capable of antagonizing at the apex with the extremity of the 

 carpus only. Second pair of gnathopoda much longer than the first ; 

 carfms infero-antcriorly produced beyond the extremity of the 

 propodos, the process being slender and cui'ved, terminating in a 

 fine point ; projuxlos increasing towards the distal extremity, in- 

 ferior angle slightly anteriorly produced ; dactylos arcuate, antago- 

 nizing at the extremity with the apex of the carpus. Perciopoda 

 gradually increasing in length posteriorly, tbe I'mirth ])air being 



