1879.] NATURAL SCIENCES OF PHILADELPHIA. 423 



d uncle. First pair of pereiopoda slender, longer than the cara- 

 pax ; meros, carpus, and hand nearly equal, the fingers half as 

 long as the palm. Second pair of feet unequal ; larger hand 

 inflated, longer than the carapax, pubescent; fingers one third 

 the length of the palm, incurved and slightly depressed ; the dac- 

 tylus with a large obtuse tooth near the base, which fits into a cor- 

 responding cavit}' in the pollex (as in many species of Alpheus); 

 pollex without teeth. Smaller hand three-fourths as long as the 

 larger, cylindrical straight fingers one-third as long as the palm. 

 Remaining pereiopoda moderate, minutely unguiculate. Telson 

 about twice as long as broad, sides strongly arcenate. 



Key West, Fla., A. S. Packard, Jr. 



Length 10 mm. 



This species differs from P. domestica Gibbes in the pubescence 

 of the carapax and hands, and in having but one tooth on the 

 dactylus of the larger hand of the second pair and none on the 

 thumb, etc. etc. It may prove to be the Pontonia mexicana of 

 Guerin-Meneville in Ramen de la Sagra's Historia fisica, politica 

 y natural de la Isla de Cuba, 1856. The types are in the Museum 

 of the Peabody Academy of Science at Salem, Mass. None were 

 collected by Prof. Webster. 



Genus Coralliocaris Stm. 1 Rostrum small; eyes large and 

 prominent; antennal scale very broad ; external maxillipeds oper- 

 culiform ; all the joints of nearly equal width; second pair of 

 pereiopoda large, long, subequal ; dactyli of posterior pairs with 

 a protuberance on the under side near the base. Type Corallio- 

 caris superbus Dana, sp. 



Genus Harpilius Dana. 2 Closety allied to Pontonia, but differ- 

 ing in having the distal joints of the external maxillipeds together 

 longer than the second "joint ; second pair of pereiopoda long, 

 slender, equal. T} r pe Harpilius lutescens Dana. 



Genus Anchistia Dana. 3 Rostrum long, slender, frequently 

 ensiform ; eyes prominent; antennulae with one flagellum partly 

 bifid ; extenal maxillipeds slender, pediform ; second pair of pe- 



1 Proc. Acad. Nat. Sci. Philadelphia, 1860, p. 38. (Edipus Dana, U. S. 

 Ex. Ex. Crust., p. 572, 1851 (nom. prseoc). 



2 Op. cit., p. 574, 1851. 



3 Op. cit., p. 577 (1851), Pelias Roux, Memoire sur le Salicoques, p. 25 

 (1831). Heller, Sitzungsber. der K. Akad. Wiss. Wien, xlv. pt. 1, p. 406 

 (1862), non Merrian (1820). 



