270 DREDGING REPORT, 1862. 
Faminy. Mf ys ide. 
Supram. MYSIN &, Dana. 
Genus. MYSIS, Zatr. 
Mysis DipEupuys,* n. sp. (Pl. XIL., figs. 9-11.) 
M. vulgari affinis at robustior; squama antennali paullo 
latiore, subelliptica, non spina acuta sed tribus ciliis plum- 
osis confecta; telsone aculeis utrinque paucioribus, fere 
decem, apiceque bispinoso, (nullis spinulis minutis sicut 
in MW. vulgari interpositis,) armato. 
A short and robust species, with immense eyes on short foot- 
stalks. The configuration of this species reminds us of J. 
oculata (O. Fab). Carapace short, leaving the three posterior 
thoracic segments, and the dorsal portion of the fourth un- 
covered, and haying in front a very short, but acute rostrum. 
Diameter of the cornea of the eyes fully equalling, if not exceed- 
ing their total length. Antenne, short. Peduncle of interior 
antenne scarcely exceeding the length of the eye. Antennal 
scale shortly lanceolate or subelliptical (Pl. XIi., fig. .0), about 
twice the length of the eye, fringed with plumose cilia all round 
its margins ; having a short second joint (P]. XIL., fig. 11), which 
is furnished with five cilia, one being situated on each side and 
three at its termination. 
Telson (Pl. XII, fig. 9), entire, one fourth shorter than the 
intermediate lamine of the tail, with about ten teeth on each 
margin; these teeth are distributed through nearly the entire 
length of the telson; and the greatest interval between any two 
teeth is between the fourth and fifth. It will be noticed that in 
the type specimen there is an irregularity in the armature of the 
telson, which has eleven teeth on one side but only ten on the 
other. The telson terminates in two large teeth, one of which 
is situated at each angle of the apex; there are no smaller 
secondary teeth between these. The external caudal lamin are 
considerably longer than the internal, and have all the margins 
ciliated. ; 
* Didelyphys the Opossum. This and the three following species were briefly described 
by the author in a paper read before the British Association at Cambridge. 
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