MUSEUM OF COMPAKATIVE ZOOLOGY. 57 



of the carapax ; the second epimeron is orbicular, broader than high and nearly 

 as broad as the whole height of the somite ; the third epimeron is broad and 

 rounded posteriorly ; the fourth epimeron is prolonged backward nearly the 

 full length of the fifth somite and is evenly rounded posteriorly ; the fifth is 

 rounded and projects very slightly posteriorly. The sixth somite is nearly 

 twice as long as the fifth, and about half as high as long. The telson is nearly 

 a third longer than the sixth somite, thin and lamellar, tapers regularly to a 

 rounded tip unsymmetrically armed with five spines and perhaps not quite 

 perfect, and above is evenly rounded and armed with two pairs of aculei. The 

 lamellae of the uropods reach a little by the tip of the telson : the inner is nar- 

 rowly ovate and nearly four times as long as broad ; the outer is less than three 

 times as long as broad, and broadly rounded at the tip, which projects much 

 beyond the tooth in which the thickened outer margin terminates. 



The eggs, which are well advanced toward maturity, are approximately 0.60 

 and 0.45 mm. in greater and less diameter in the alcoholic specimen. 



All the oral appendages agree very closely with those of Palcemonetes varians 

 (Leach sp.) and the number and arrangement of the branchias are apparently 

 the same as in that species, though I am not certain that there is more than one 

 arthrobranchia at the base of the external maxilliped. [Palcemonetes varians 

 and Leander natator have the same branchial formula as Palcemon squilla.] 



The single specimen is from Station 316, N. Lat. 32 7', W. Long. 78° 37' 30", 

 229 fathoms, bottom of pebbles, and gives the following measurements : — 



Sex ? 



Length from tip of rostrum to tip of telson 25.0 mm. 



" of carapax including rostrum ...... 9.3 



" of rostrum 3.8 



" of antennal scale . . . . . . . . 3.7 



Breadth of " " 1.4 



Length of first pair of legs ..... right, 8.9 ; left, 9.5 



" chela ......." 1.8 " 2.0 



" second pair of legs .... " 11.5 " 15.0 



" ischium . . . . . . . u 2.4 " 3.1 



" merus ...... "2.5 " 3.3 



" carpus . . . . . . ' . " 1.-5 " 1.8 



" chela " 3 7 " 5.0 



" dactylus " 1.5 " 2.0 



" third pair of legs , 12.5 



" propodus 3.5 



" dactylus , . 0.5 



" sixth somite of abdomen 3.0 



Height of " " " 1.5 



Length of telson 4.3 



