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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXVI. 



above; the seaphocerite has its hiteral spine more elongate, so that 

 it attains the length of the carpocerite. 



In these characters the specimens recall the form antillensis of 

 S. mi7ius, bnt they are perfectly distinct from it ; it is as if the two 

 species, while themselves closely allied, had effected in the same 

 way parallel variations. While in the variety antillensis of S. minus 

 the carpocerite is ovoid, the feet of the second and third pairs are 

 strong, and the telson is wide; in the variety guenni of S. hre vicar- 

 pus the carpocerite is slender and cylindrical (proportion 1:4 and 

 even 1 : 4.4), the carpns of the second pair is 12 times as long as wide, 

 the meropodite of the third pair is 4.5 to 4.7 times as long as wide, 



and the telson is narrow, as in the 

 typical specimens of the species. 



The chelae of the first pair are those 

 of S. minus. The proportions for the 

 small chela are : Fingers 1 ; total 

 length 2.26 ; height 0.75. 



I have been able to see the eggs on 

 only one female of very small size, 

 and infested with a Bopyrid ; they are 

 of the same volume as those of S. 

 minus. According to the appearance 

 of the mature ovary of another fe- 

 male, I think that it is their normal 

 size, and that this is besides another 

 character which distinguishes these 

 specimens from S. brevicarpus, at the 

 same time approaching S. minus. 



I give to the variety the name of 

 guerini because it perhaps corresponds 

 to Alphcus saulcyi of Guerin. In the 

 figure by that author ° the rostrum is 

 longer than the lateral spines and the 

 basicerite appears to be spinous above. It is proper to note that in 

 the nomenclature the trinomial appellation does not imply that this 

 form is derived from S. hrevicarpus ; the contrary would be as plaus- 

 ible; the forms with large eggs, always rare, may be considered as 

 derived from the species in which the eggs have the usual small size. 



Localities : 

 Florida : 



Elliotts Key, J. E. Benedict. 

 Harbor Key, Union University collection. 

 Key West, H. Hemphill, Bean and King, Eliot, Union 

 'University collection. 



Vui. 30. SVNALPHEIS BREVICARPU.S 



GUERINI. a, FRONTAL AND ANTEN- 

 NAL REGION ; a', FRON^ ; C, CARPO- 

 CERITE. 



"Hist. Cuba de mmioii de la Sa^ra, I't. 2, VII, 1857, p. 18, pi. ii, fig. 8. 



J 



