NO. u;50. AMERICAN SPECIES OF SYNALPIIEUS—COUTIERE. 53 



Localities — Coiitinned : 

 Florida — Cont inued : 



Key West (form guerini), Union University collection. 

 Dry Tortugas, Eastern Dry Kock, Salt Pond Key, and 

 Florida Bay, Edward Palmer. 

 Bahamas : 



Andros Island (some coming from sponges), F. Stearns 



collection. 

 Green Cay, B. A. Bean. 

 Porto Rico: 



Off Humacao, 9| fathoms, Fish Hawk Station No. 6099 

 (type of form guerini). 



Type of S. bre vicar pus guerini.— Cat. No. 24797, U.S.N.M. 



LyEVIMANUS Group. 

 SYNALPHEUS LONGICARPUS (Herrick). 



Alpheus saulciji var. longicarpus Hebkick, Mem. Nat. Acad. Sci., V, 1891, 

 p. 383 (part). 



I have previously shov^n that this species is closely allied, not to 

 A. hrevicarpus Herrick, but to the European species S. Imvimanus 

 (Heller). However, it is not synonymous with the latter, any more 

 than any of the forms which follow. I have indicated in the intro- 

 duction to this work why it was necessary to break up into several 

 distinct specific forms A. saulcyi var. longicarpus Herrick. I have 

 retained the original name for the above species, as it appears to me 

 to be the most abundant of the L^vimanus group on the American 

 coasts. 



The frontal border has three unequal teeth, the median narrow, 

 a little longer, the lateral having from 2 to 2.5 times the width of 

 the median part of the rostrum; their interspaces are in form of 

 a V, with borders little divergent. 



The basal antennular article is the longer; its anterior margin 

 is less emarginate on the inside than in the greater part of the 

 species of the group. The relative lengths of the articles are 2, 1.5, 1. 

 The antennule is 5 times as long as wide ; the flagella are slender, the 

 external bifurcates after the sixth article. 



The stylocerite reaches the distal third of the basal article. The 

 basicerite has its superior angle obtuse; its lateral spine reaches the 

 extremity of the median article of the antennule. The scaphocerite 

 is almost always devoid of a scale in the male; it bears one of variable 

 length in the female, but it hardly surpasses the extremity of the 

 basal antennular article, and it is never more than half the width of 

 the lateral spine, which is very strong, sharp, and exceeds the anten- 

 nule by about half its distal article. 



