PALAEMON (EUPALAEMON) LENZII. 227 
of the orbital margin, from this margin is nearly one-sixth 
the distance (19 mm.) between this tip and the posterior 
margin of the carapace. 
In the second male, which is 79 mm. long, the rostral 
formula is — The 3rd tooth is situated above the 
orbital margin, its tip reaching just beyond it; the 3rd to 
8th teeth are equidistant, but one observes 2 apical teeth, 
the foremost quite near the tip and the distance between 
the two apical teeth is half as long as the distance between 
the posterior apical tooth and the antepenultimate or 
8th tooth. In this specimen the lower margin carries 5 
teeth, the 1st just below the 6th of the upper margin, the 
5th opposite the posterior apical tooth. In the third male, 
which is only a little younger than the second, there are 
also 5 teeth on the lower margin, but, like in the largest 
specimen, one observes on the upper margin 8 teeth and 
1 apical tooth, the 34 tooth situated above the orbital 
margin; the anterior tooth of the lower margin is placed 
a little behind the apical tooth. The formula for this male 
is therefore 22 that of the youngest specimen, which 


is 68 mm. long, again ae k like in the largest. The ar- 
rangement of the upper teeth is also the same, but the 
Ath tooth of the lower margin is situated nearer to the 
apical tooth. In Pal. duw the 2nd tooth is already 
situated above the orbital margin, and the teeth both 
of the upper- and of the lower margin are smaller, less 
prominent than in Pal, Lenzii, their posterior margin 
being longer with regard to the anterior. 
In Pal. duz the rather small hepatic spine is placed 
only a little before the level of the 1st rostral tooth; in 
Pal. Lenzii, however, this spine is a little larger and situated 
just beneath the middle of the distance between the 1st and 
the 2.4 tooth, except in the third male, in which this spine 
is placed just below the 2nd tooth. 
The telson appears a trifle wider at its base in proportion 
Notes from the Leyden Museum, Vol. XXXIII. 
