Lacaze-Duthiers, and also by F.
Here we need only further draw attention to the osphradium, discovered by Lacaze-Duthiers, and shown by Spengel to agree in its innervation with that organ in all other Gastropoda.
(X about 50; after La.caze-Duthiers.) and then, surrounding itself with the secretion of its cystogenous cells, comes to rest.
What are commonly known as galls are vegetable excrescences, and, according to the definition of Lacaze-Duthiers, comprise " all abnormal vegetable productions developed on plants by the action of animals, noreparticularly by insects, whatever may be their form, bulk or situation."
Though, as Lacaze-Duthiers remarks, a certain relation is necessary between the " stimulus " and the " supporter of the stimulus," as evidenced by the limitation in the majority of cases of each species of gall-insect to some one vegetable structure, still it must be the quality of the irritant not strictly obsolete, is now seldom used; the formation is felt to be somewhat uncouth, so that the use of the word in the plural in commonly evaded " (New Eng.
The largest class are the unilocular, or simple, external galls, divided by Lacaze-Duthiers into those with and those without a superficial protective layer or rind, and composed of hard, or spongy, or cellular tissue.
Foremost among those who between 1840 and 1880 laboured in this field are the French zoologists Henri Milne-Edwards° and Lacaze Duthiers, 10 to the latter of whom we owe the most accurate dissections and beautiful illustrations of a number of different types.
De Lacaze-Duthiers, papers in the Annales des sciences naturelles, e.g.
In 1857 Lacaze-Duthiers raised them to the rank of a division equal to Lamellibranchia.
Lacaze-Duthiers, "Histoire de l'organisation et du developpement du Dentale," Ann.