90 Bulletin, Yanderhilt Marine Museum, Vol. Ill 



nodule; the sterna corresponding to the first pair of appendages is 

 roughly triangular and bears a deep groove in the median line; the 

 sterna corresponding to the second, third and fourth pairs of limbs 

 are similar in shape but graduatingly increase in width posteriorly, 

 the fourth being widest. The sutures between all the sterna are dis- 

 tinct, those of the second to fourth sterna, inclusive, extend inward 

 slightly more than half the distance to the median line; that of the 

 fifth sterna extends farther in, almost to the median line ; its apex is 

 distinctly punctate. 



The first pair of legs are stout ; the second are longer and slenderer ; 

 the third are the longest ; the fourth are about the same as the second ; 

 the fifth are the shortest and weakest; all have the dactyl stout, 

 acute, and furnished with bristles on the first, second and third legs, 

 and with slender spines interspersed with bristles on the fourth and 

 fifth legs. 



The first abdominal somite is short, decidedly grooved ; the second 

 and third somites are the longest, subequal ; the fourth somite is about 

 four-fifths as long as the third ; the fifth somite is about four-fifths as 

 long as the fourth ; the posterior of each somite is fringed with short, 

 close-set setae. The lateral angles of the somites are produced into 

 acute teeth directed posteriorly ; that of the first segment is most 

 acute ; those of the second and third are broader ; of the fourth and 

 fifth more curved; of the sixth broadly curved, less acute; the post- 

 lateral margins of all the somites are finely serrate just above the 

 apical tooth, while in P. argus there is a single spine, and also the 

 same in P. guttatus but slightly differently placed. Pleopoda are 

 wanting on the first abdominal segment ; those of the second segment 

 consist of a single broad, ovate, membranous lamina ; the pleopoda of 

 the third segment are about one and one-half times as long as those 

 of the second and narrower ; those of the fourth segment are slightly 

 longer than those of the third, while those of the fifth segment are 

 smaller and more acuminate. 

 Synonymy. — Palinurus laevicauda Latreille, Nouv. Diet. d'Hist. 



Nat., t. XVII, p. 295, 1803-04.— Desmarest, Consid. sur les Crust., 



p. 185, 1825. — H. Milne Edwards, Hist. Nat. Crust., vol. II, p. 



30i, 1837. 

 fPanulirus inermis Pocock (young specimens), Journ. Linn. Soc. 



Zool., London, t. XX, p. — , 1890. 

 Panulirus ornatus Pocock and various other authors have confused 



P. laevicauda under this name. 



