[59] DECAPODxV FROM ALBATROSS DREDGINGS. 403 



Male. — Tbo form and areolation of tbe carapax are very uearly as in 

 the last species, but tlie rostrum terminates in an aciciUar tii) longer 

 than in tbat species. Tbe eye-stalks are considerably longer tban in 

 tbe last species, and tbe eyes are much larger, tbe diameter being about 

 a ninth of the length of the carapax, while in the last species it is not 

 more tban a thirteenth, Tbe antennuliB, antenna^, and oral appendages 

 are essentially as in tbe last species ; and, excepting the dactyli of the 

 fourth and tifth i)airs, which are broken and in part wanting, tbe same 

 is true of the pemeopods. 



Tbe form of all the somites of tbe pleon and tbe telson are very nearly 

 as in the last species, but the lamellae of the uropods are apparently 

 slightly broader in proportion. Tbe sexual appendages (petasma) of 

 the fi)st pleopods (Plate X, Fig. 2) are larger and conspicuously dif- 

 ferent in form from those of the last species, though essentially the 

 same in general plan of structure. The broad, oval process (a) over the 

 narrow base of attachment is much smaller; the inferior chitiuous edge 

 of the middle part is complicated in form, being divided into three ir- 

 regular lobes, tbe outer of which projects in an obtuse point, and is sep- 

 arated from the others by a deep and irregular sinus, while the other 

 lobes are broad, truncated, the outer longer tban the inner, and sep- 

 arated from it by a small, narrow sinus; the inner of these lobes is sep- 

 arated by a broad, rounded sinus from a large, broad lobe which arises 

 from tbe anterior side and projects over the membranous inner part of 

 tbe ai)pendage. This last lobe (b) is very much larger and proportion- 

 ally broader tban the corresponding lobe in tbe last species, and has a 

 small lobule on tbe inferior side near tbe base. The two plates at the 

 base of the inner ramus of the second jileopod are of nearly the same 

 foim as in the last species, but somewhat larger. There are also two 

 small processes on the base of the outer ramus, but the proximal one is 

 very small, low, and inconspicuous, while the distal is very much larger, 

 conspicuous, lamellar, and ovate, with the tip directed downward away 

 from tbe other process. 



Measurements, in millimeters, of the single specimen, from Station 

 2003, March 23, north lat. 37° IG' 30", west long. 74o 20' 30", 040 fath- 

 oms, are given in the second column of the following table, and similar 

 measurements of A. elegans in the first column. 



station 



A. elegans. A. valens. 



2003 



Sex ? 



Length from tip of rostrum to tip of telson 43 



Lenjitli of carapax, including rostrum 13. 5 



Length of rostrum 2.0 



Bight of carapax 



Broadtli of carapax , 



Length of eye-stalk and eye I ' 3. 3 



Createst diameti r of eye i 1. 



Length of aiitennal scale | 7. 3 



Breadth of antennal scale i 2.4 



d 



38 



10.7 

 2.0 

 6.2 

 6.0 

 3.3 

 L2 

 6.7 

 2.0 



