350 . Dr.Lzacu's Arrangement of the Crustacea, &c. 
lato. Palpi pediformes S-articulati, articulo medio longiore, 
primo brevissimo. 
Ad femine abdominis basin est uterus externus e membranis duobus. 
concavis valvuliformibus efformatus, quo pulli nuper ex ovo exclusi 
J vivunt, crescunt. 
* Cauda lamellá intermediá emarginatá. 
Spec. 1. Mysis spinulosus. 
M. caudá lamella intermedia externe spinulosá apice acute emar- 
ginata: lamellis exterioribus acuminatis latissime ciliatis. 
Praunus flexuosus. Leach, Edin. Encycl. vii. 401. 
Habitat in mari Scotico apud the Frith of Forth. 
| Spec. 2. Mysis Fabricii. 
M. caudá lamellà intermedià apice obtuse emarginatá: lamellis 
exterioribus apice rotundatis. 
Habitat in mari Groenlandico. 
** Cauda lamellä intermediá integrá. 
Spec. 3. Mysis integer. 
Praunus integer. Leach, Edin. Encycl. vii. 401. 
Habitat apud Loch Ranza in Arran insula, frequentissime. 
Length one-third of an inch. Colour pellucid cinereous spotted 
with black and reddish-brown. Eyes black. Females more abun- 
dant than the males. | | 
At low tide near Loch Ranza the pools were full of this spe- 
cies, swimming with its head uppermost and its eyes spread; 
making a most grotesque appearance. 
Divisio 
