110 CARCINOLOGICAL NOTES ; 



hoped that the following notes which embrace almost every species, 

 nominal or otherwise, will aid some future reviser in the work. 



To aid in the identification of forms I have thrown the species into 

 groups characterized by more or less prominent features ; but there 

 remain a number of nominal forms which (either from inadequacy of 

 description or from the works in which they are published being in- 

 accessible to me) are not so arranged. 



A. Rostrum present; orbital hoods prolonged into spines. 



a. Dactylus of 1st pair normal, i. e., working in a vertical plane and 



above the pollex. 



* Larger hand constricted above and below. 

 A spine on basal joint of antenna. 



Alpheus megacheles Norman. 



Ilippolyte rubra Westwood. Mag. Nat. Hist., viii, p. 272 (1835); non 



Alpheus ruber Eclw. ex Rafinesque. 



Hippolyte megacheles Hailstone. Mag. Nat. Hist., viii, p. 395 (1835). 

 Dienecia rubra Westwood, 1. c., p. 552 (1835). 

 Alpheus edwardsii Ed wards. Hist. Nat. Crust., ii, p. 352 (1837) ; Dana 



U. S. Exp. Exp. Crust., p. 543, pi. xxxiv, flg. 2 (1852); non 



Audouiu. 



Alpheus affinis Guise. Ann. & Mag. N. H., II, xiv, p. 275 (1854). 

 Alpheus platyrhynchus Heller. Sitzungsber. K. Akad., Wien, xliv, i, 



p. 400, pi. 1, f. 21-24 (1862). 



AJpheus milnei Guerin, in De Sagra's Hist. Cuba, Crust., p. xlix (1857). 

 Alpheus megacheles Norman. Ann. & Mag., N. H., IV, ii, p. 176 



(1868). 

 England to the Mediterranean (Auct.). 



Alpheus thetis White. PI. II, flg. 7. 



Alpheus thetis White. List Crust. Brit. Mus., p. 76 (1847) sine descr. 

 Miers Zool. Voyage Erebus & Terror, Crustacea, p. 5, pi. iv, f. 

 7 (1875). 



The following description giving some details additional to those of 

 Mr. Miers, is drawn from two specimens in the museum of the Acad- 

 emy of Natural Sciences of Philadelphia, presented by Dr. T. B. Wil- 

 son and labelled in Adam White's handwriting. They agree well with 

 the figure quoted above and may be regarded as typical. 



Front three spined, rostrum slightly longer than the ocular spines 

 and separated from them by deep sulci. Second joint of antennular 

 peduncle much the longest, the peduncle equalling the antennal scale 

 in length. External maxillipeds much exceeding the antennal scales. 



