Smith.] 276 [February 3, 



nus Sauss., P. texanus Stimp., ]\ tranmenm Stint] *, and 7*. abbre- 

 viatus Stimp., from the eastern coasts of North America and the 

 West Indies; P. chilensis Edw. et Lucas, P. crenatus Edw. et Lucas, 

 and P. transversus Stimp., from the western coasts of Central and 

 South America; and P. kevis Dana, described as from an unknown 

 locality, but referred to the west coast of South America by St imp- 

 son (Annals Lye. Nat. Hist., N. Y., Vol. VII, p. 54). In these notes 

 seven additional species are described, four of them from the east and 

 three from the west coast. 



I add here a table to facilitate the determination of the species. 



A. A tubercle on the sub-hepatic region just below the first lobe 



of the antero-lateral border of the carapax. 



a. Antero-lateral margin of the carapax armed with project- 



ing teeth, of which the three posterior ones on each 

 side are prominent and sharply angular. 



1. External hiatus of the orbit a broad and deep open- 



ing. Tubercle of the sub-hepatic region prominent. 

 P. Herbstii, P. vqlidus. 



2. External hiatus of the orbit a deep notch rather than 



, an opening. A groove along the outer border of 

 the carpus next the articulation with the hand. 

 P. occidentalis, P. serratus, P. Hartlii, P. Bradleyi. 



b. Antero-lateral margin divided by slight incisions into four 



lobes (the first being composed of the angle of the 

 orbit coalesced with the second normal tooth), the 

 first three truncate, the fourth forming the lateral 

 angle of the carapax. Tubercle of the sub-hepatic 

 region not prominent. 



P. transversus, P. politus, P. planus. 



B. No tubercle on the sub-hepatic region. External hiatus of 



the orbit small. 

 l/LV P. crenatds, P. Harrisii, P. depressus, P. Sayi. 



Having had no opportunity to examine P. americanus, P. texanus, 

 P. abbreviatus, P. chilensis, P. Wurdemanni and P. Icevis, they are 

 not included in the table. 



Panopeus Herbstii Edw., Hist. nat. des Crust., tome i, p. 403, 

 1834 (non Cancer Panope Herbst). 



Carapax moderately convex and crossed by a few very slight gran- 

 ulous ruga?, areolation distinctly marked, but the areolets not pro- 



