86 THE ROTIFERA. 
This large and handsome species, one of the finest of the Salpine, I was at first in- 
clined to identify with S. redwnca of Ehr.; but it is more than double the size of that 
species, and the great development of its alvine spines sufficiently distinguishes it. It 
may be regarded as bearing the same relation to redwnca as S. macracantha bears to 
ventralis. I have seen several examples; one from the Lake at The Grove, Stanmore, 
the residence of my esteemed relative, Mrs. George Brightwen.—P.H.G.| 
Length, J; inch; horizontal width, ;1; inch; depth, 5}, inch. Habitat. Wool- 
ston; Stanmore (P.H.G.): rare. 
S. suncaTa, Gosse, sp. nov. 
(GEIL OU, Tare, fg) 
(SP. CH. Occipital spines two, slightly procurved ; pectoral two, straight, acute ; 
lumbar single, short, with a widened base; alvines longer, straight ; dorsal cleft very 
wide, with outcurved edges. 
The lorica is of the usual outline, but somewhat wide, both in the vertical and 
lateral aspects. Of the anterior spines the pectoral are the shorter and straight, the 
occipital incurved. In the rear, the alvine pair the longer, and recurved; the lumbar 
short, straight, acute, with an abruptly widened cuneate base. From this lumbar 
point two dorsal ridges run up, curving outward to the occipital spines (figs. 7, 7), in- 
closing a shallow depression, which appears covered with only membranous integument. 
The lorica, on the ventral surface, is quite continuous and evenly rounded. I had some 
protracted and satisfactory sights of the creature in various positions, particularly from 
a point directly in the rear, and at different angles, by which I distinctly saw the dorsal 
furrow. One of these views is carefully delineated at fig. 7b. 
I know this form only from a single specimen just dead (but with the soft parts not 
yet decayed), which occurred, Sept 14, 1885, in water from Woolston Pond, sent me 
just a month before. It seems to be undescribed, yet well-marked by its broad dorsal 
furrow, widening forward. It has no relationship with Ehrenberg’s S. bicarinata, from 
which, however (to judge by his figures,—for of diagnosis he gives none), it is sufficiently 
distinct. It is a small but interesting form.—P.H.G.] 
Length. Of lorica, without toes, ;1, inch; transverse width, ;}; inch. Habitat. 
Woolston (P.H.G.): rare. 

{I am indebted for my knowledge of a very distinct species, S. mutica, to Dr. Collins’s 
Note-book of pencilled sketches, minute but carefully executed. I have enlarged his 
figures (Pl. xxii. fig. 3). He has added no note to this form; but his delineations were 
made from specimens procured from a secluded pool near Sandhurst Military College, in 
December 1866. He identifies the species with S. mutica of Herr Perty. 
From these it appears that the lorica does not vary much from the normal form (as 
in S. brevispina, for instance); save that the front is straightly truncate, without any 
spines, that the dorsal fissure is narrow and shallow throughout, and that it slightly 
widens behind, where its edges terminate in two very slightly prominent lumbar 
points: alvines seem wholly wanting. This species looks toward the genus Diplaz, 
as sulcata looks toward Diplois, yet both appear to be true Salping.—P.H.G.] 

Genus DIPLOIS, Gosse, gen. nov. 
[GEN. CH. Lorica, more or less depressed, ovate in outline ; formed of two sub- 
equal plates, wnited by elastic membrane; the dorsal plate arched, ridged, and split 
down the middle ; the ventral flat ; toes straight, furcate ; eye single, cervical. 
shaped expansion, into the upper obtuse point of the bladder. (See the description of the preceding 
specics.) 
