328 
BRITISH ENTOMOSTRACA. 
The genus Lernentoma was first established by Blain- 
ville in his monograph of the Lerneadae, in the ‘ Journ. 
Phys./ 1822, to contain those Lerneae which, as in Chon- 
dracanthus, were distinguished by their having processes 
or appendages taking the place of the thoracic feet, but 
having long, club-shaped, oviferous sacs. 
Oken, in his ‘Lehrbuch der Naturgeschichte,’ 1815, 
had placed the several species belonging to Lernentoma 
in. his genus Anops ; but as that genus is loosely charac- 
terised by him, and embraces several species belonging 
not only to different genera, but even to different tribes, 
I have preferred adopting that of Blainville. Lamarck, 
in his ‘Hist. Nat. An. sans Vert./ first edition, iii, 1816, 
places them in his genus Entomoda ; but as that genus 
embraces also several species belonging to different fami- 
lies, though it likewise has the precedence in time, I con- 
sider the more restricted and better- defined genus of 
Blainville as worthy of preference. Most authors, how- 
ever, have described the various individuals belonging to 
Lernentoma as Chondracanthi. 
1. Lernentoma cornuta. Tab. XXXV, fig. 2. 
Lerjst^a cornuta, Muller , Zool. Dan., i, t. 33, f. 6; Enc. meth., 
t. 78, f. 1. 
Entomoda cornuta, Lamarck , Hist. An. s. Vert., iii, 685. 
Anops cornuta, Oken, Lehrbuch der Naturg., iii. 
Lernentoma cornuta, Blainville , Jonrn. Phys., xcv, 441, No. 6. 
Chondracanthus cornutus, Cuvier , Regne An., iv, 258. 
— Nordmann , Mik. Beitr., ii, t. 9, f . 5, 6 (?). 
— M. Edwards , Hist. Nat. Crust., iii, 
500, No. 1. 
Horned Lernasa, Shaw, Naturalist’s Miscellany, viii, t. 295. 
Character. — Female. Head oval, rather elongated. 
Antennae flattened, of considerable size, and projecting. 
Thorax elongated, club-shaped. Anterior portion narrow 
for about a third of its length ; the other two thirds much 
broader, and terminating posteriorly in two sharp lateral 
tubercles of moderate length, and a middle one represent- 
