DINOCHARID Ai. 77 
Mr. J. G. Tatem (‘‘ Quart. Journ. Mier. Sci.” vol. vii. 1867, p. 252, with figs.) 
described and figured a Stephanops (S. longispinatus) with one long dorsal spine, no 
posterior spines, and two short straight spines (one on each side) on both the first and 
second joints of the foot. Mr. T. Bolton (in 1884) published among his fly-leaves a 
Stephanops (S. bifurcus) with one long dorsal spine, and one short posterior spine 
slanting backwards and upwards, from the end of the lorica; both spines on the median 
line, and none on the foot. Mr. J. Hood in the same year sent me a drawing of yet 
another species (S. armatus) with one long dorsal spine, and two short posterior spines, 
one on each side of the end of the lorica slanting slightly upwards and outwards, and 
somewhat convex to the lorica. This species also had no spines on the foot. Mr. 
Hood’s figure is given in pl. xii. of the ‘‘ Journ. Roy. Micr. Soc.” 1885. 
Family XIII. SALPINADA. 
[Body more or less completely inclosed in a firm lorica, which is open at each end, and 
divided down the back by a fissure whose sides are united by membrane ; two furcate 
toes always exposed. 
We come now to forms which are indubitably and manifestly loricate, the integument 
permeated by a peculiar chemical principle known as chitine, which imparts hardness 
and stiffness to it without diminishing its transparency. This substance is unaffected by 
alkalis, which immediately destroy all the flesh and membranous parts: a fact which is 
often useful to the scient, as by the addition of a minute drop of caustic potash to the 
cell containing a specimen to be examined, he can in an instant obtain the external 
form unchanged, generally clear and bright, with all the internal organs, that had marred 
distinct vision, dissolved away. 
The animals we have now to consider are clothed in a coat-of-mail (lorica) more or 
less complete, of which the edges are sharply marked. Thus they display an evident 
analogy with the shelled MOLLUSCA, and one more close with the Enromosrraca, with 
which, in its bivalve tribe Ostracoda, the present family may be advantageously compared. 
The lorica here consists of two lateral segments of an ovoid box, open in front and 
behind, for the emission of the head and the foot, the two edges parallel and approximate 
along the dorsal line, and either widely open along the belly, as in Diaschiza, or united 
and soldered into one there, as in Salpina and Diplax. The front is composed of 
ciliated prominences, not protected by an arching hood; the foot is provided with two 
furcate toes.—P.H.G.] 
Genus DIASCHIZA, Gosse, gen. nov. 
(GEN. CH. Body compressed ; the dorsal half of the trunk inclosed in a carapace, 
which is split medially ; one eye present, usually cervical ; trophi virgate, not distin- 
guishable from those of Furcularia; toes long, blade-like, furcate. 
This well-marked group, now consisting of seven species, was wholly unsuspected a 
few months ago. One after another has occurred to my own observation, within the 
past year, and I strongly suspect that other species will yet be discovered. The genus 
forms a very striking link of connection between the Loricate and Il-loricate sub-orders, as 
will be shown, more in detail, under the remarkable species D. semiaperta.—P.H.G. | 
D. VALGA, Gosse, sp. nov. 
(Pl. XXII. fig. 12.) 
[SP. CH. Lorica decurved ; eye occipital, small ; toes long, slender, much decurved. 
Among filaments of Myriophyllum, growing in an aquarium, very thickly beset with 
various Diatomacee, &c., appeared in March 1885 an active, restless, little creature, 
