CLIPPERTON ISLAND DECAPODS—CHACE 609 
Alpheus clippertoni (Schmitt) 
Crangon hawaiiensis clippertont Schmitt, 1939, p. 11. 
Crangon nanus Banner, 1953, p. 90, figs. 30, 31. Not C. nanus Krégyer, 1824. 
Alpheus nanus Banner, 1956, p. 345; 1957, p. 198. 
Alpheus huikau Banner, 1959, p. 139, fig. 5. 
Materia: Northeast shore, rocks south of landing place; July 21, 
1938; Sta. 9-38; W. L. Schmitt; 5 males, 4 ovigerous females (holotype 
and paratypes). 
MEASUREMENTS: Carapace lengths of males to base of rostrum, 2.4— 
3.6 mm.; of ovigerous females, 3.0-4.5 mm. 
Remarks: The grooves on the outer surface of the major chela of 
this species are much more prominent than indicated in the original 
description. Comparison of this material with the type of Crangon 
nanus leaves little doubt that they belong to the same species. The 
peculiar form of the pleopods and the broadened third maxillipeds 
suggest that the species belongs to another genus, possibly Metalpheus 
as intimated by Banner (1953), but it seems best to retain the current 
combination until more extensive studies of alpheid relationships are 
made. 
Disrrisution: Saipan, Mariana Archipelago; Arno Atoll, Marshall 
Islands; Raroia Atoll, Tuamotu Archipelago; Hawalian Islands; and 
Clipperton Island. 
Alpheus paracrinitus Miers 
Alpheus paracrinitus Miers, 1881, p. 365, pl. 16, fig. 6.—Holthuis, 195la, p. 74. 
Alpheus paracrinitus var. bengalensis Coutiére, 1905, p. 901, pl. 32, fig. 37. 
Crangon paracrinitus Schmitt, 1939, p. 12. 
Crangon paracrinita var. bengalensis Banner, 1953, p. 110, fig. 40. 
Marteriau: Northeast shore, rocks south of landing place; July 21, 
1938; Sta. 9; W. L. Schmitt; 2 males, 4 ovigerous females.—Poison; 
October 20, 1956; W. Baldwin; 1 cheliped. 
MEASUREMENTS: Carapace lengths of males to base of rostrum, 
3.6 and 5.0 mm.; of ovigerous females, 3.5-5.0 mm. 
Remarks: As Schmitt (1939) has pointed out, these specimens 
“seem to bridge the differences existing between the species proper 
and its known variety bengalensis Coutiére.”” There has now been 
an opportunity to compare them with an ovigerous female collected 
by R. Bassindale at Prampram, Ghana, in 1950; the typical form 
was first described from Senegal. The only apparent difference 
between the Clipperton material and the West African specimen is 
the proportionately longer antennal scale in the latter. In the 
specimens from Clipperton, the spine of the scale reaches about as 
far as the end of the antennular peduncle and falls far short of the 
end of the antennal peduncle; in the Ghana specimen, it reaches well 
beyond the end of the antennular peduncle and nearly as far as the 
antennal peduncle. On the other hand, Banner (1953) has mentioned 
