16 THE ROTIFERA. 



vibratilc trigs. There arc the usual sperm-sac and protusilc penis, the latter lying 

 " behind the foot under a valve-like flap." 



Length, of female, cir. ^^ in. ; of male, cir. ^\y in. Habitat. Dundee (.J. H,) ; 

 Staines (Eousselet and Western). 



AsPLANCHNOPus SYRINX, Ehreuberg (PL XXXIV. fig. 37). 

 Notomviata syrinx .... Ehrenberg (42) ; Schmarda (134 and 135). 



SP. CH. Body bell-shaped ; foot very sinall, scarcely visible ; jaws {rami) curved, 

 bifid at the point. 



This Rotiferon, according to Ehrenberg, is very similar to A. myrmcleo, but differs from 

 it in the following points. The surface of the head is convex ; the foot is hardly visible, 

 and has two minute toes ; the points of the rami are bifid ; and the vibratile tags are 

 not more than from eight to thirteen on each side. 



Schmarda found this Rotiferon in Egypt, and in a well on Adam's Peak in Ceylon. 

 He noticed in one fcetus a secondary tooth to each ramus. No other observer appears to 

 have met with this animal, except Wcisse. 



Length. About ,V inch. Habitat. Berlin (Ehr.) ; Egypt and Ceylon (Schmarda) ; 

 St. Petersburg (Weisse). 



AsPLANCHNOPUS EUPODA, Gosse (PI. XXXI. fig. 8). 

 Asplanchna cupoda . . ' . . . . Gosse (169). 



[SP. CH. Body globose, tvith a st02d foot, retractile at will; rami of incus long, 

 each armed on its inner edge with four widely-severed teeth. 



The most remarkable feature is the foot, which is, proportionally, much larger than 

 in A. myrmcleo. The pincer-like rami are those of a novm&l Asplanchna, having a close 

 resemblance to those oi A. priodonta, save that their inner edges arc not cut into saw- 

 teeth, but beset with three distant spinous teeth, while each curved point is double. I 

 have examined eight or ten examples, all from the canal, Smallheath, Birmingham. 



Length, >,V, inch. Habitat. See above ; lacustrine. P.H.G.] 



Sacculus saltans, Bartsch (PI. XXXII. fig. 24). 

 Ascomorplm saltans Bartsch (7, 8). 



SP. CH. Body %vith two dorsal longitudinal ridges, and tivo lateral ; lateral view 

 sac-like, nearly symmetrical ; head truncate, ivith a lip-shaped projecting ^rocea on the 

 mid-dorsal edge of its base ; corona a simple marginal circle. 



The body of saltoMS is bounded (says Dr. Bartsch) by four surfaces which meet in four 

 longitudinal ridges, two dorsal and two lateral. Unlike viridis, its lateral view shows a 

 dorsal outline very similar to the ventral ; and its flat head, with the thumb-like dorsal 

 process, is very different from the low cone which rises from the neck of Mr. Gosse's 

 Rotiferon. Its manners, too, are striking. Dr. Bartsch describes it as now hovering over 

 the same spot, now suddenly darting forward, now turning on its longer axis, and now 

 spinning round its transverse horizontal or vertical one ; and, when these antics are over, 

 again returning to hover over the old spot as before. 



Length, -^\^ inch. Habitat. Near Tiibingen (Bartsch). 



Sacculus hyalinus, Kcllicott (181), (PI. XXXII. fig. 23). 



SP. CH. Body hyaline, ivith tivo lateral, sub-dorsal grooves ; lateral view oval, 

 almost symmetrical, the dorsal outline a little more curved than the ventral ; dorsal view 



