NO. 3564 HEMISQUILLA ENSIGERA—STEPHENSON 34 
Distribution 
Randall’s (1839) Hawaiian record, suggesting continuous pan- 
Pacific distribution has been shown by Manning (1963b) to have been 
based upon an incorrectly labelled American specimen. Evidently 
Australasian and American populations are geographically distinct. 
Past American records show a discontinuous antitropical distri- 
bution, with distinct Californian and Chilean records, the latter 
including Juan Fernandez (see Schmitt, 1940). One specimen, col- 
lected by the Allan Hancock Foundation, links these populations by 
the following measurements: juvenile, anterior half of body only, 
carapace length 6.0 mm, rostral length 1.7 mm, rostral breadth 1.7 
mm, length eye 3.0 mm, length eyestalk 2.3 mm, length cornea 2.5 
mm, breadth cornea 2.3 mm, no mandibular palps visible. Other 
data are: Jicarita Is., Panama, dredging east side, 24 fms, shelly 
gravel, coll. W. L. Schmitt, Hancock Galapagos Exped., Velero Sta. 
240-34, Feb. 20, 1934, USNM 76381. This specimen is obviously a 
Hemisquilla as evidenced by (1) the raptorial claw having a single 
terminal tooth and not being swollen basally, (2) the articulation 
between the merus and ischium being terminal, (3) the carapace 
lacking carinae, and (4) the detailed structure of the narrowest part 
of the cornea (see p. 10) being identical with that of specimens of H. 
ensigera. Apart from the unlikely event of the first specimen of an 
undescribed species being a damaged juvenile, it must belong to H. 
ensigera. 
Although only 37 specimens have been available for study, it is 
evident that the species is common in the Californian region. The 
California Department of Fisheries and Game advise that it is fre- 
quently caught on rod and line (one was so caught in the author’s 
presence) and by skin divers. Verbal confirmation has been received 
from various unofficial sources. The contrast between apparent 
abundance and numbers available for study from this region suggests 
the possibility that additional specimens may be recovered from 
Central American waters in future years. Present records certainly 
extend the known southern limit of the Californian population, as 
evidenced by the following specimens all recently obtained from 
Mexican waters: 
(1) o&, east side of North Coronados Is., lower Calif., fishing 
line at 100 ft (833 m), Aug. 20, 1949, coll. John L. Perkins, RI 6.2-6 
(SIO). 
(2) o, Ensenada, lower Calif., Feb. 10, 1958, RI 6.2-11 (SIO). 
(3) 2%, 5.4 mi E Morro Redondo Pt., Cedros Is., 41 fms (74 
m), trawl, Apr. 20, 1951, Velero Sta. 2030-51 (AHF). 
