236 A HISTORY OF RECENT CRUSTACEA 



lines which Professor Ivinahan mentions when he says, 

 1 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 While, 

 namely Hippolyte Mitchelli, Thompson, and Hippolyte 

 W/iitei, 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 Spirontocdris 

 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 Ilippolyte 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 

 Spirontoca/ris spinus. To the same genus must apparently 

 be referred two other British species, that which Bell calls 

 Hippolyte Oranchii, 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 algge at small depths 



