new Ileterotanais and a new Eurydice. ; 169 
particulars, but the thumb of the cheliped is of widely 
different form. 
Hab, Procured by Mr. Robert Gurney at Six-mile House, 
on the Bure, and also at Reedham, on the Yare, Norfolk. 
Heterotanais Orstedi (Kroyer). 
(Pl Vile ties, 223%) 
1842. Tanais Orstedi, Kriyer, Naturhist. Tidssk. vol. iv. p. 183; 
Voyages en Scand. &e. pl. xxxi. figs. 3 a-l. ; 
1842. Tanais curculio, Kroyer, /. ¢. p. 184; Voyages &c. pl. xxx. 
fios, 4a-h.  . 
1852. Tanais balticus, Friedrich Miiller, “ Tanais rhynchites and balticus 
neue Arten aus der Ostsee,” Archiv f. Naturg. 18 Jahre. p. 89. 9. 
1852. Tanais rhynchites, Friedrich Miiller, J. c. p. 88. ¢. 
1896. Tanais Orstedi, G. O. Sars, Crust. Norway, II. Isopoda, p. 14, 
pe vi. oo 2: 
In this species the thumb or “ posteriorly-pointing lappet ” 
of the cheliped of the male is narrow at the base, and widening 
thence in clavate form has the extremity truncated, with a 
little notch near the anterior corner. It is similarly repre- 
sented in the figures of Kréyer, Miiller, and G. O. Sars, and 
the figures given by Miiller are here reproduced (Pl. VI. 
figs. 2, 3) for comparison with the better-known illustra- 
tions of Sars. These drawings will show how much this 
appendage differs from that of H. Gurney?. 
Heterotanais Urstedi is recorded from Oresund (Kréyer) ; 
Baltic, at Landskrona and Westervic (Lil/jeborg) ; Prussia, at 
Greifswalde (Miller) ; Bohusliin (Liljeborg) 3 Christian- 
sand (Boeck); and Iddefjord, at Fredrikshald, Norway 
(G. O. Sars). Specimens in my own collection are from 
Landskrona (Liljeborg) and Denmark (from Copenhagen 
Museum). 
Genus Eurypicr, Leach. 
Eurydice rotundicauda, sp. n. 
(Pl. VI. figs. 4-7.) 
Antennules a little shorter than the peduncle of the an- 
tenne; flagellum consisting of four articulations, combined 
length of the three distal slightly less than that of the first, 
which is wholly devoid of the dense covering of downy sete 
