608 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 113 
given to the Clipperton lagoon fauna by recent expeditions may 
account for the failure to rediscover the species there. Also, there is 
evidence that the lagoon may have had a higher salinity in 1898 and 
that it may have had a more extensive fauna than it does at present. 
Subfamily Pontoniinae 
Harpiliopsis depressus (Stimpson) 
Harpilius depressus Stimpson, 1860, p. 38. 
Harpiliopsis depressus Holthuis, 1951b, p. 70, pls. 21, 22, figs. a-f. 
Mareriau: Northwest end, reef; August 14, 1958; Sta. W58-288; 
Reese, Baldwin, and Wintersteen; 3 males, 1 ovigerous female.— 
Intertidal; August 7-26, 1958; E. S. Reese; 1 male.—Northeast 
transect, 36 feet; August 27, 1958; Chess and Hambly; 1 male, 1 
ovigerous female.—Northeast corner, 45 feet; August 30, 1958; 
Limbaugh and Chess; 1 male——Coral at 20 to 40 feet; August 1958; 
Allison and Limbaugh; 3 males, 1 female. 
MEASUREMENTS: Carapace lengths of males, 1.7-3.5 mm.; of 
female without eggs, 2.2 mm.; of ovigerous females, 2.7-3.7 mm. 
Remarks: In the smallest specimen, which has a carapace length 
of 1.7 mm., the appendix masculina is about half developed. 
DistRIBUTION: Red Sea and Seychelles to the west coast of the 
Americas from the Gulf of California to Colombia. 
Family Alpheidae 
Alpheus lottini Guérin 
Alpheus lottint Guérin, 1830-1831, pl. 3.—Holthuis, 1958, p. 22. 
Crangon ventrosa Banner, 1953, p. 84, fig. 28.—Hertlein and Emerson, 1957, p. 6. 
Alpheus ventrosus Banner, 1958, p. 164, fig. 4. 
MateriAu: Northeast side, 45 feet; August 28, 1958; Limbaugh, 
Chess, and Hambly; 1 male, 1 ovigerous female.—Northeast corner, 45 
feet; August 30, 1958; Limbaugh, Chess, and Hambly; 1 male, 1 
ovigerous female.—Coral reef, intertidal; August 1958; E. S. Reese; 
1 male.—Coral at 20-40 feet; August 1958; Allison and Limbaugh; 
1 male, 2 ovigerous females.—Kast side, reef flat, margin or ridge, 
0-2 feet; September 14, 1958; Limbaugh and Chess; 1 male.—North- 
east side, 50-60 feet; September 20, 1958; C. Limbaugh; 1 ovigerous 
female. 
MEASUREMENTS: Carapace lengths of males to base of rostrum, 
6.7-8.6 mm.; of ovigerous females, 5.6-7.3 mm. 
Remarks: There is an excellent discussion of the variation and 
synonymy of this species in Banner (1958). 
DistriBuTION: Red Sea and South Africa to the Gulf of California. 
