352 THE REY. T. R. R. STEBBING ON 
- 1881. Dynamene darwinii Miers, P. Z.5. Lond. p. 79. 
U-1884. Cymodocea darwin Studer, Abh. K. Ak. Wiss. Berlin, 
1883, p. 18, pl. 2. figs. 6, 6.4, 66. 
1886. is darwint Beddard, Rep. Voy. ‘Challenger,’ 
vol. xvii. pt. 48, p. 150. 
- 1891. a darwintt Dollfus, Miss. Cap Horn, Crustacés, 
p. 65, pl. 8. figs. 8, 8a, 8b. 
EOI 55 darwiu Ortmann, Princeton Univ. Exp. 
Patagonia, p. 649. 
Hansen in his treatise on the Spheromide is evidently alluding 
to this species when he says (p. 125), “According te kind 
information from Dr. Calman, D. Darwiniit (Cunningham) has 
exopod of plp.* divided by an articulation; the species must, in 
my opinion, be established as a new genus near Paracerceis.” 
On this recommendation I have acted, naming the genus after 
Mr. Vallentin, te whose researches I owe the opportunity of 
examining the species. An interesting feature is the dilatation 
at the fifth pereeon segment, well marked in Cunningham’s figure, 
and noticed by Dollfus but scarcely appreciable in his coloured 
drawing of an example 19 mm. long. The specimen I have had 
under observation measured only 9mm. The apical emargination 
of the telsonic segment is squared at the base. The epistome is 
not like the figure given by Dollfus; it widens much more 
abruptly backwards, and then narrows before forming the divergent 
arms which clasp the upper lip. The mouth-organs are much as 
in Cymodoce. The first antenne have a very large first joint 
followed by a short one, to which succeeds one that is long and 
slender. ‘The first gnathopods are rather robust, but as Dollfus 
notices, the large tooth produced from the base of the hand is no 
doubt a male eharacter, giving to that sex im this genus a pair of 
prehensile hands. 
In his eubranchiate group Hansen makes an infermal separation 
between the genera which: have and those which have not an 
articulation of the exoped in the third pleopod. In the present 
species the articulation is very conspicueus, through the strong 
incurving of the inner margin of each joint at the junction; the 
exopod itself is unusually narrow. The fourth and fifth pleopods, 
in accord with their systematic position, have beth rami strongly 
pleated. There are five of the denticulate bosses on the end of 
the exopod in the fifth pair; the exoped ef the feurth pair is 
clearly two-jointed. 
Locality. Stanley Harbour, low water. 
‘Tribe VALVIFERA. 
Fam. ASTACILLIDS. 
1897. Astacillide Sars, Crustacea of Norway, vol. ii. p. 88. 
1901. SA Ohlin, Svenska Exp. Magellanslind. vol. ii. 
p. 265, 
