G 
11.-J3ESCR1FT10N OF TJIE SPECIES. 
(rilUSTACEA. 
0 ;Y/(?r.— I*liyll0])0(la. 
Familij.—LUINADrnyF.. 
ESTlIEllIA, lUippell Straus, 1837. 
(Mils. Senckeuherg. 1837, n, p. 119.)* 
Estheuia Coghlani, Cox, El. 1, E'ii'’s. 1-5. 
Esthcria Coghlani, Cox, Proc. Linn. 8oc. N. 8. Wales, foi’ 1880 [1881], v, pt. 3, p. 27G. 
Sp. Char . — Carapace valves oval, but more commonly assuming some 
moflillcation of that form from distortion. Hinge border straight, but shorter 
tlian the valves. Umbones anterior, at the front end of the hinge border. 
"Central margin very couvexly rounded. Anterior margin rounded below, 
sinuous above, being excavated under the umbones ; posterior margin rounded, 
insensibly passing above and below into the hinge liorder and ventral margin 
respectively. Ornament of rather irregular concentric costa or ridges. 
Ohs .- — It is very difficult to draw up determinate characters for such 
variable little bodies as Esthcria. I have here considered the form occurring 
at Moore Eark, as the type of l)r. Cox’s species, as that appears to bo the one 
to whieh he originally applied the name of E. Coghlani. The specimens, I 
regret to say, are not extant ; but Eigs, 1-5 are taken from the original 
draAvings of his fossils. I take I’ig. 1 to represent the correct outline and 
appearance of the species, Avhilst in Eig. 2 wo have a form more oval in shape, 
and Avith a nearly central uml)o, AAdiich has been thrust or s(pieezed upAvards, 
and the shell jwessed rather oblicpiely. In Eig. 3 the umbo is equally median, 
but depressed, and the Avhole shell has to some extent been obliquely distorted. 
I have most carefully compared a numl)er of Esthcria from the Dent’s 
Creek Bore AAuth these draAAungs, and notAvithstanding an opinion which has 
* Fide T. R. Jones, Mon. Foss. Estherioe, 1862, p. 10. 
