DINOCHAPJD.E. 77 



Mr. J. G. Tatem ("Quart. Journ. Micr. Sci." vol. %-ii. 18G7, p. 252, with figs.) 

 described and figured a Stejihanojis (S. loiigispimitus) 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 

 Stcphanops {S. bifurcKs] with one long dorsal spine, and one short posterior sjiine 

 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 pi. xii. of the " Journ. Eoy. Micr. Soc." 1885. 



Family XHI. SALPINAD.E. 



[Body more or less completely inclosed in a firm lorica, which is open at each end, and 

 divided dmcn the back by a fissure whose sides are united by membrane; two furcate 

 toes abvays exposed. 



We come now to forms which are indubitably and manifestly loricate, the integument 

 permeated by a peculiar chemical 25rinciple 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 Entomostraca, 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 i/iose o/ 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 3-ear, 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. 

 (PI. XXn. fig. 12.) 



[SP. CH. Lorica, decurved ; eye occipital, small ; toes long, slender, much dec urved. 



Among filaments of Myriophyllum, growmg in an aquarium, very thickly besei with 



various Diatomacece, &c., appeared in March 1885 an active, restless, little creature, 



