2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
calibrated eyepiece of a stereomicroscope. Both are accurate to 
ca. 0.1 mm. 
Two considerations are involved: first, whether the material from 
Australia and New Zealand (i.e. Australasia) is identical with the 
American, and secondly, what names to apply to the different popu- 
lations. 
The author is deeply grateful to Drs. Raymond B. Manning and 
John C. Yaldwyn for helpful suggestions, to Miss May Rees for 
assistance in computations, and to Mr. I. F. Horton for advice on 
statistical matters. Thanks are also due to the directors and cura- 
tors of Crustacea of the above-mentioned institutions for allowing me 
to examine their Hemisquilla collections. I also wish to thank the 
directors and curators of Crustacea of institutions not mentioned: 
Johns Hopkins Marine Laboratory, the Queensland Museum, Bris- 
bane, and the Tasmanian Museum, Hobart. 
Names of Chilean Material 
At the generic level the following names have been employed: 
Gonodactylus Latreille, 1825 (e.g., by H. M. Edwards, 1837; Nicolet, 
1849; Miers, 1880; and Bigelow, 1894); Pseudosquilla Dana, 1852 
(e.g., by Rathbun, 1910; Kemp, 1913) and Hemisauilla Hansen, 1895 
(e.g., by Schmitt, 1940; and Manning, 1963b). 
Most workers have used the specific epithets styliferus or stylifera, 
following H. M. Edwards’ (1837) description of Gonodactylus styliferus. 
Rathbun (1910) showed that G. styliferus H. M. Edwards is a homonym 
of G. styliferus (Lamarck, 1818), now Pseudosquilla ciliata (Fabricius, 
1787). She substituted the specific epithet bigelowi, and Gonodactylus 
styliferus H. M. Edwards became Pseudosquilla bigelowi Rathbun. 
This name has been used by a number of American workers for Cali- 
fornian material (e.g., Hilton, 1915a, 1915b; Buchsbaum and Milne, 
1960). 
Meanwhile Australian records have been under P. stylifera (H. M. 
Edwards) by Whitelegge (1900) and Kemp (1913); and under H. 
stylifera (H. M. Edwards) (following Schmitt, 1940) by Stephenson 
(1953, 1954) and Stephenson and McNeill (1955). 
Manning (1963b) has shown that Gonodactylus ensiger Owen, 1832, 
from Chile is clearly the Hemisquilla that H. M. Edwards described as 
G. styliferus. Manning stressed the color similarities between Owen’s 
description and preserved Chilean material, which leaves no doubt 
that Hemisqulla ensigera (Owen, 1832) has priority as the name for 
the Chilean form. He is also using this name for Australian material 
(Manning, 1967). 
