IOC) 
MODERN SYSTEM. 
It was observed with young from the middle of June to the 
middle of July. The females are one-third more abundant than 
the males. 
Length an inch and a quarter. 
** Intermediate lamella of the tail entire. 
Sp. 2. Mysis integra. 
Praunus integer. Leach, Edin. Encycl. vii. 401. Mysis integra. Leach, 
Trims. Linn. Soe. xi. SoO.—Supp. to Encycl. Brit. i. 429. 
Inhabits brackish pools of water, left by the tide at Lock Rauza in the 
Isle of Arran. Common in the month of August with young. 
Length one third of an inch. 
Females more abundant than the males. Colour whilst living pel- 
lucid cinereous, spotted with black and reddish brown. 
Division III. — Tail with two seta, one on each side. 
Fam. VI. Nebaliadje. Leach. 
Genus 38. NEBALIA. Leach. 
Thorax anteriorly with a moveable rostrum : anterior pair of legs longest, 
simple ; other pairs equal, approximate, with the last joint bifid : 
antenna two, inserted above the eyes, the last joint bifid and multi- 
articulate. 
Sp. 1. Neb. Herhstii. Gray or cinereous-yellowish ; eyes black. 
Cancer bipcs. Oth. Fabr. Fn. Grin. no. 223. fig. 2. Herbst, ii. tab. 24. 
fig. T. Mysis bipes. Lair. Hist. Nat. des Crust, et des Insect, vi. 285. 
Monoculus rostratus. Montagu, Trans. Linn. Sue. xi. 14. tab. 2. Jig. 5. 
Nebalia Ilerbstii. Leach, Zool. Miscel. i. 100. tub. 44. — Trans. Linn. 
Soc. xi. 351. — Sapp, to Encycl. Brit.i. 422. 
Inhabits the European Ocean ; it is common beneath stones lying on 
l, -Pick mud, on the southern coast of Devon. 
Genus of doubtful situation. 
Genus 39. MECALOFA, Leach. 
The situation of this curious genus, which is figured in Dr. Leach’s 
Malacoslraca Brit. (tub. 25.), is still doubtful. It however decidedly 
belongs to the Macrouea, as Dr. L has discovered to be the case, 
since the publication of the first volume of the Supp. to Encycl. Brit. 
Legion II. E D R I 0 P II T II A L M A. 
The Malacoslraca Edriopkthahm, or at least a greater part of them, 
were placed amongst the Maciioura by Latreille, who considered them 
as forming a particular family of that order. 
Section I. 
Body laterally compressed. 
