i SALPINAD ZS. 81 
D. TENUIOR, Gosse, sp. nov. 
(Pl. XXII. fig. 14.) 
[SP. CH. Body sub-cylindrical ; dorsal cleft of lorica wide throughout; toes 
thick, nearly straight, obtusely pointed. 
Here is a species which bears a relation to Furcularia gracilis,! similar to that 
which D. semiaperta bears to F’. gibba. In September, 1885, while I was examining 
water, sent me by the courtesy of Miss Davies from Woolston Pond, my attention was 
arrested by first one and presently another, of what appeared indubitable F’. gracilis. 
Each was either half-concealed, as it burrowed in the floccose matter, or in swift motion 
as it glided through the clear water; so that, while I could recognize the form and 
general character as accurately agreeing with drawings which I had carefully made of 
that species, many years before (except that these were of rather stouter build), I could 
get no opportunity of testing the condition of the back. Presently, however, I was so 
fortunate as to catch sight of the integument of a dead specimen of the same, perfect in 
form, but empty and transparent, the mastax in sitw. By imparting currents to the water 
in the live-box, while the object was under my eye, I could turn it into various positions ; 
among others, one in which I could look along the line of the back. It was distinctly 
double-ridged, and rather wide-cleft. The gap is of nearly uniform width from the 
occipital edge of the lorica to the hinder edge just over the foot. I have said that the 
form was stouter than of £. gracilis; it appeared stouter now than in the two living 
restless examples that had first attracted my attention. But I reflected that the dead 
lorica would naturally be broader than in life, because, the tegumentary membrane of 
the venter haying been ruptured by decay, the elasticity of the dorsal shields would 
naturally cause their lateral expansion. 
Circumstances prevented my further study of the two living specimens; and I can 
give no further information of the anatomy than what was to be learned from the dead 
body.? The features, however, that were visible were, from the very stillness of death, 
definable with precision. The toes, in particular, are diverse from those of any other 
Inown species, being not sensibly recurved nor decurved, but straight, or nearly, not 
blade-shaped, but round, rather thick, abruptly brought to a point.—P.H.G.] 
Length. About +35 inch. Habitat. Woolston Pond; Dundee (P.H.G.): rare. 
Genus DIPLAX, Gosse. 
(Ann. Nat. Hist. 2 Ser. vol. viii. Sept. 1851, p. 201.) 
(GEN. CH. As Salpina, but the eye is wanting, and the lorica is destitute of 
spines in front and rear ; foot and toes long and slender. 
The two species of this genus I found both in the same water, Oldham’s Pond, 
Leamington, and both on one day, July 18, 1850. Of the first, only one specimen 
occurred ; the second was numerous. With a single exception of the latter, I have never 
again met with either. They both approach very close to Salpina, but the absence of 
spines is notable, and the toes are proportionally more attenuate and longer. The 
head is seated in a flexible tube, cleft at the occiput, which is capable of entire involution 
within the lorica. It seems an approach to the persistent neck-tube of Dinocharis, to 
which genus the present is allied by the condyles of the foot, and by the length and 
slenderness of the toes.—P.H.G.] 
' I strongly suspect that Herr Eckstein’s delineation of F’. gracilis (Sieb. u. Koll. 1883, pl. xxvi. fig. 
43) has actually been drawn from a specimen of Diasch. tenwior. 
* Recently (March 1886) I have found it, in an aquatic moss sent me by Mr. Hood. It was very 
restless, but I saw that the trophi, viewed dorsally, were on the pattern of Notommata lacinulata— 
P.H.G. 
VOL. II. G 
