SALPINAD ZG. 87 
Of the two noble species for which this genus is constituted, the general form and 
aspect suggest their location in the next family, while the technical characters fix them 
here. At the first glance at their elegant forms, like ample oval plates of the clearest 
elass, evidently broader than deep, we hesitate not instantly to pronounce them normal 
Euchlanes ; but a moment’s observation reveals a fissure through the back, so charac- 
teristic of the Salpinade. The affinity between Diplois propatula and Salpina sulcata 
is very close. 
The internal organization, so far as observed, agrees with that of Huchlanis. 
It is possible that the #. bicarinata of Herr Perty and the H. Weisswi of Dr. Leydig 
may belong to this genus; but I have seen no diagnosis, or figure, of either.—P.H.G.] 
D. PRoPATULA, Gosse, sp. nov. 
(Pl. XXIV. fig. 2.) 
(SP. CH. Dorsal cleft wide before, closed behind ; ventral plate considerably less in 
outline, furnished with three spines behind ; toes very long, of uniform thickness. 
This species is broadly ovate, sometimes nearly circular, in outline, the dorsal plate 
strongly arched, and medially ridged ; the ridge cleft so widely that the lorica is oblit- 
erated at its front in a vertical view, forming an acute point at each side. Each side of 
the fissure, from the lateral point, approaches the other in a graceful curve, till, at the 
hind-back, they unite at an acute angle. ‘The posterior margin of the plate extends 
beyond this, forming the uninterrupted segment of a circle. The ventral plate is of 
similar outline, but very much smaller, and quite flat. It ends behind in three acute 
spines, of which the laterals diverge and the middle one projects from the general level. 
The foot, of strongly marked articulations, is protruded between the plates ; the toes, of 
great length and tenuity, are straight, of uniform thickness throughout, with blunt 
points. No sete have been detected on the foot-joints. The internal organization pre- 
sents nothing distinctive, so far as it has been observed.! 
The interspace between the lorica-plates is considerable ; and this, together with the 
great width of the dorsal cleft, produces a curious effect, as the animal twists about, 
making the triple character of the lorica, with its pots and angles, very apparent. 
This distinct and imposing form has but recently come under my personal observa- 
tion. But it is figured by Dr. F. Collins in his Note-book, from specimens obtained 
twenty years ago near Sandhurst Mil. Coll. Figs. 2 and 2a are carefully copied from 
his pencil sketches. On two separate occasions I have found the species, at each time 
in water sent from the original pool, which thus is its only recognised habitat. Its 
motions are elegant and lively, and its appearance most attractive-—P.H.G.] 
Length. Fully extended, about |; inch. Habitat. Pool at Sandhurst, Berks (Dr. 
Collins; P.H.G.): rare. 
D. Davies, Gosse, sp. nov. 
(Pl. XXIV. fig. 3.) 
[SP. CH. Dorsal cleft narrow, parallel-sided, open throughout ; ventral plate nearly 
equal, with no posterior spines ; toes blade-shaped. 
This species occurred in water dipped from Miller's Pond, Woolston, The lorica is 
decidedly triquetrous, the dorsal plate rising with sides slightly bulging, to what would 
1 Tt will be observed, however, that while in my own figure (2a) the gastric glands are of the ordinary 
form, Dr. C. has represented a pair of large pyriform sacs, each containing a vacuole, with long and 
slender ducts which lead from (or into) the esophagus. These suggest the remarkable structure found 
in Pterodina, to which I refer the reader. 
2 The toes are here represented as out-curved; whereas, in the living examples I have seen, these 
organs were quite straight. Dr. Collins is a very accurate observer, and the length and curvature of 
the toes (“slightly curved’’) are distinctly mentioned in his MS. notes. In his transverse section, 
moreover, the lorica-plates are much closer together than I have seen them. Possibly, in both these 
particulars, there is some individual variation. 
