>iS. /. Smith — Early Stages of the American Lobster. 365 



the propodiis are relatively shorter, the body of the dactylus has in- 

 creased in length so that it is more than half as long as the propodus, 

 but the styliform tip is mnch shorter, scarcely if at all longer tlian 

 the dactylus itself, but still retains its armature of sharp teeth along 

 one side. The exopodus, epipodns, and the four branchial appendages 

 are the same as in the second and third pairs. 



The posterior legs (plate XVII, hg. 5, enlarged 20 diameters, and 

 fig. 5a, terminal portion enlarged 40 diameters) are proportionally as 

 long as the fourth pair, l)ut are more slender. The ju'opodus and 

 dactylus are relatively longer and more slender than in the lii'st stage, 

 and the terminal stylet of the dactylus, though longer than in the 

 foiirth pair, is but little longer than the dactylus itself. The exopo- 

 dus is like that of the other legs and the single branchial appendage 

 is like the others. 



Tlie abdomen is slightly stouter relatively than in the first stage, 

 and the appendages of the second, third, fourth and fifth segments 

 have appeared. The dorsal spines i;pon the second to tlie sixth seg- 

 ment are of the same form liut sliglitly shorter than in the first stage, 

 and the spiniform lateral angles of the same segments are a little 

 shorter and stouter. 



The telson (plate XVIII, fig. 2, enlarged 20 diameters) is relativelv 

 smaller and broader at base, being more quadrilateral in outline, and 

 the stout plumose seta^ of the posterior margin are much smaller. 

 The articulation between the telson and the penultimate segment is 

 more distinct than in the first stage, but apparently still admits of 

 very little if any motion. 



The natatory legs of the second, third, fourth and fifth segments 

 (plate XVIII, fig. 5, one of the legs of the third segment, enlarged 

 30 diameters) difter somewhat in size in difl:ei-ent specimens, but are 

 nearly as long as the segments themselves. The terminal lamella* of 

 these appendages are simple, oblong and sack-like, without sign of 

 segmentation or clothing of hairs or setae. 



Specimens in this stage were taken only twice, July 1 and 15. 

 They have the same habits and general appearance as in the first 

 stage. In color they are almost exactly the same, only the orange- 

 colored mai'kings are i)erhaps a little less intense. 



Third larval stage. 

 In this stage (plate XIV, fig. ^, enlarged 8 diameters) the larva? 

 are about half an hich (12 to 13""") in length, the integument is 

 of a firmer consistency than in tlie earlier stages, and the entire animal 



