Dr. W. M. Dobie on two new species of Floscularia. 237 



M. Peltier* as identical with his Floscularia ornata. BothDujar- 

 din and Peltier found the rotatory organ five-lobed in the species 

 observed in France. Admitting these descriptions to be correct, 

 we must either hold with Pritchard that the Floscularia ornata 

 has sometimes five, at other times six lobes, or consider the five- 

 lobed species of Peltier and Dujardinf to be a variety of Ehren- 

 berg' s true Flos, ornata. 



In no kind of Floscularia ornata has any cornu or process been 

 seen attached to any of the lobes. My friend Mr. Hallett, late 

 of the Museum of the Royal College of Surgeons, writes me that 

 he finds the Flos, ornata with a six-lobed rotatory organ and no 

 process. 



M. DujardinJ, in describing his family Floscularia, observes as 

 follows on the masticatory apparatus of the genus Floscularia : — 

 " The Floscularia has simple mandibles ; in the Stephanoceros the 

 mandibles are compound." With this assertion of Dujardin I 

 do not agree ; the whole apparatus closely resembles that of the 

 Stephanoceros, only on a smaller scale. One thing I feel certain 

 of is, that the tooth is bifurcated and therefore cannot be simple. 



In figure 5 I have endeavoured to represent the dental appa- 

 ratus of the Floscularia as I myself have frequently observed it. 

 I cannot vouch for its entire accuracy, as it is very difficult to 

 obtain a good view of them. 



M. Dujardin § thus observes regarding the eggs: " Les oeufs 

 montrent un seul point rouge et non deux comme ceux qu'a re- 

 presented M. Ehrenberg." I must here also differ from M. Du- 

 jardin. In nearly all my examinations of the eggs and young of 

 the Floscularia, 1 have been able to make out two very distinct 

 red eye-spots ; they appear in the egg when it has reached its 

 full size, but are best seen in the young animal. 



Dujardin' s observations || differ from those of Ehrenberg in 

 another particular ; I again quote from Dujardin's work : " Ce 

 mem'e auteur (M. Eh.) leur assigne un etui membraneux, mais 

 ceux qui ont ete observes en France manquent toujours de cet 

 etui." My own observations coincide with Ehrenberg' s descrip- 

 tions ; the sheath is never absent except in the very young animal, 

 but is often so delicate as to escape superficial observation. 



The two Floscularias described in this communication were 

 obtained from a pond situated in Trevalyn in the parish of 

 Gresford, Denbighshire, within a few yards of the boundary line 

 limiting the detached portion of Flintshire in Gresford. The 



* Annales des Sciences Naturelles, 1838, t. x. p. 40, planche 4. 

 t Hist. Nat. des Infus. p. 610. 



I Hist. Nat. des Infus. p. 60U, also at p. 611. " Les niaehoires m'ont 

 paru unidentSes." 



§ Hist. Nat. des Infus. p. 611. || lb. p. 609. 



