CBTJ8TA0EA. 
93 
GEOUr STOMAPODA. 
MYSIBJE. 
Genus, Mysis. — LaU . 
Logs tei'minatiiig in a nniltarticulate Gxtremity supporting 
a second multarticulate branch attached to the ‘ ‘ coxa, or fii st 
joint. Pemale carrying the ova beneath the body in a pouch. 
Mysis chameleon. — (Opossum Shrimp.) — V. Thompsm, Zool. 
Research, p. 27; Milne Edwards, Mist, des Crust., t. ii, p. 457. 
M. Spinulous. — Couch’s Cornish Fauna, p. 80. 
“ Common in summer, when it draws near the shallows from 
deep water. It also enters rivers in multitudes, forming a long 
line of migrations, at which season it is much devoured by the 
trout. Its English name is taken from its habit of carrying the 
©ggs in a receptacle under the body, until they are hatched, as in 
the analogous genus of q^uadrupeds, the opossum tribe. 
There are other species as well as the nearly allied genus 
Cynthia on our coast, but they are here omitted for want of 
a recent opportunity for comparison. 
Mysis oEiFFiTHSiiE. — Bell, 8talk-eyed> Crust, p. 342. 
We have taken this supposed species, but I feel assured that it 
is only the younger stage of a maerurous form, probably Palcetnon 
Crangon, the young of either genus of which it closely 
approximates. 
Genus, Thysanapoda. 
Branchia external and pendulous, branched, legs having the 
Secondary branch short. 
•fnYSANAroDA CoucHii. — Hell, Stalh-eyed Crust, p. 346. 
This species was described by Professor BeU from specimens 
aent to him by “ Mr. Couch, who obtained them from the Cornish 
eoast from the stomach of a mackerel, which appeared to have 
i>oen making a feast of this rare and interesting little Crustacea. 
author adds “ The following account has been kindly 
i9.mished me by that gentlemam, and shows that it can scarcely 
considered as an ordinary inhabitant of our coasts. The 
Mackerel from which the curious shrimps Thysanopoda were 
faken, were caught almost at mid-channel, or almost ten leagues 
^rom us, perhaps seven or eight south of the Lizard j and I have 
^ot seen any since, although I am much in the habit of search- 
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