236 A HISTORY OF RECENT CRUSTACEA 
hues which Professor Kinahan mentions when he says, 
‘the specimens vary remarkably and beautifully in colour ; 
pink, red, salmon, emerald-green, cobalt-blue, gray, choco- 
late-brown, opal white, are among the prevailing tints ; 
the ova of a chocolate-brown.’ Hippolyte viridis (Otto) is 
another species common to Great Britain and the Medi- 
terranean, of which two species mentioned by Adam White, 
namely Hippolyte Mitchelli, Thompson, and ~ Hippolyte 
Whitei, Thompson, are merely synonyms, while in the 
opinion of Czerniavsky, at least in 1869, viridis itself is a 
synonym of Hippolyte Prideauxiana, Leach, which is found 
on the coast of Devon. A third British species is Hippolyte 
fascigera, Gosse, which has the ‘body studded with de- 
ciduous tufts of plumes, and a fourth is the slender Mysis- 
like Hippolyte producta, Norman, 1861. 
Having restored Hippolyte to the place occupied by 
Virbius, Spence Bate established the genus Spirontocaris 
to receive those species which could in consequence no 
longer stand under Hippolyte. Of this new genus he makes 
Hippolyte spinus (Sowerby) the type as Spirontocaris spinus, 
and considers Hippolyte securifrons, Norman, a synonym of 
it. The species extends its range from the north of Great 
Britain to Iceland and Greenland. A Norwegian species 
was briefly described in 1861 as [Hippolyte Liljeborgi, by 
Danielssen, who says: ‘The rostrum is very prominent, 
laterally compressed, and ending in a strongly upward 
bent spine; the upper margin furnished with ten nearly 
equally large, strong spines ; yet the two first are a little 
smaller; the innermost margin is strongly convex and in 
front furnished with three spines.’ As this is acknow- 
ledged to be identical with Norman’s securifrons, it will, if 
Spence Bate be right, become an additional synonym of 
Spirontocaris spinus. 'To the same genus must apparently 
be referred two other British species, that which Bell calls 
Hippolyte Cranchii, Leach, and one named Hippolyte pusiola 
by Kroyer. Bell’s species pandaliformis has been identi- 
fied with the earlier Hippolyte Gaimardii, Milne-Edwards, 
above mentioned ; J. Sp. Schneider records its occurrence 
in quite incredible numbers among algz at small depths 
