ACADEMY OF SCIENCES. 105 



30. Eriphia squamata. Stimpson. Notes on North American Crustacea, p. 



10. (Annals Lyceum Nat. Hist., N. Y.) 



Panama. Gorinto, Nicaragua. 



31. Trapezia formosa. S. I. Smith. Proc. Bost. Soc. Nat. Hist., Feb. 3 



1869.' 



Pearl Islands, Bay of Panama, among Pocillopora capitata, Verrill. 



32. Trapezia cymodoce? Guerin. Dana. U. S. Ex. Exp., p. 257, pi. XV, 



Fig. 5. S. I. Smith, loc. cit. 



Locality the same as the preceding species. 



33. Quadrella nitida. S. I. Smith. loc. cit. 



Locality, Pacheca, one of the Pearl Islands, 6 to 8 fathoms, among pearl 

 oysters. 



When Stirupson, in 1857, published his " Crustacea and Echinodermata of 

 the Pacific Shores of North America," not a single species of the large fam- 

 ily Portunidte had been discovered. The same naturalist in his " Notes on 

 North American Crustacea," published in 1859, mentions one species, Lupa 

 bellicosa, Sloat, MS., but gives no description, remarking that it " agrees with 

 L. hastota in almost every character, except that the last two joints of the ab- 

 domen in the male are broader and more flattened." 



In February of this year I described a second species, a specimen of which 

 had been procured the preceding year at Mazatlan by Mr. Henry Edwards; 

 and I shall in this paper describe a third, of which many individuals have 

 been collected by Mr. W. J. Fisher at various points on the Western and 

 Eastern shores of Lower California. At Magdalena Bay Mr. Fisher procured 

 several very specimens of a Lupa, which I take to be the L. bellicosa of Sloat 

 and Stimpson, but as Sloat's MS. is not on hand, and Snmpson gives no 

 figure, my sole reason for this belief is that the other two known species from 

 Lower California, belong to the genus Amphitrite, as defiued by Dana. 



That there may be no confusion I append a description of this Lupa. 



Lupa bellicosa? Sloat, MS. Stimpson. Notes on N. Amer. Crust., p. 11. 



Carapax regularly arched in its longitudinal and transverse directions; ex- 

 ceedingly wide, the post and antero-lateral outlinesformingalongellip.se; 

 no areolation except a sulcus between the median and posterior regions. 

 Central tooth of front placed low down, between the internal antenna?, and 

 separated by a short, somewhat pilose, space from the front proper, which 

 has two lateral spines separated by a sinuous central portion. Upper margin 

 of the orbit consisting of two long teeth, an ante and post-orbital; the former 

 highest above the outer antenna?, and separated by a deep notch from the 

 latter, which is two-loberi, the anterior lobe low, and the posterior long and 

 pointed. Antero-lateral teeth nine, including the posterior lobe of the post- 

 orbital, which exceeds in height any of the others except the ninth. 2d, 3d, 



