PHILODINAD.E. 9 



EoTiFEE ELONGATUS, Wcbcv (199), (PI. XXXII. fig. 8). 



SP. CH. Body greyish; cuticle crossed by transversa folds forming thirteen or 

 fourteen segments ; lobes of the corona small. Proboscis short ; eyes two, round, rod ; 

 teeth tioo ; toes three, long, cylindrical, slightly apart, retractile. Spurs thick at the 

 base, short, with mobile free extrem,ities. 



The corona of elongatios is scarcely wider than the greatest breadth of the body, and 

 the whole animal when extended forms a long, gently tapering, cone. The length of 

 the fully extended foot is about ^ of the whole Rotifer. The corona is feeble, and 

 the animal rarely swims, but creeps swiftly. The proboscis is short and thick, bearing 

 an aureola of cilia. The foot has six segments, gradually diminishing in size from the 

 cloaca to the toes. The spurs are widely divergent, slightly curved, and pointing some- 

 what to the toes : their tips are faintly articulated, and mobile. The three toes are 

 long, round, and cylindrical, like little worms ; and, once displayed, they separate 

 slightly, in order to fix themselves on an object : they are usually retracted. M. Weber 

 says that this species is distinguished from others of the genus by the form and length 

 of the toes, which resemble the toes of Actinurus, with this diiierence, " that the toes 

 [of Actinurus'] are very long and 7ion-retractile, remaining always extended, and acting 

 somewhat as points of support {un balancicr)." Here, however, M. Weber is in error. 

 Both Mr. Gosse ' and myself have often seen the toes of Actinurus drawn in, just liko 

 those of any other Botifcr. 



Length. Almost that oi Actinurus ne2)tunius. Habitat. Near Geneva (Weber). 

 R. EEYTHE^us, Elirenbcrg (42), is an imperfectly observed, and very doubtful species. 

 R. MAxiMus, Bartsch (1),^R. tardus (vol. i. p. 105). 



E. iNFLATus, Dujardin (40), is a species formed by confounding together several 

 PhilodincB ; and by refusing to distinguish between the genera Philodina and Botifcr. 

 R. MEGACEROS, Schmarda (134), (PI. XXXIl. fig. 10.) is said to have a pair of spurs 

 on each of the last two joints of the foot ; those on the penultimate joint being very 

 long and curved : I have given Schmarda's figure of the spurs. 



Callidina pigra, Gosse (1G9), (PL XXXI. fig. 2). 



[SP. CH. 'Boiij fusiform, fluted, not collared; column having a decurved acute 

 hook; s^puvs minute ; wiscera, rufous. 



I have seen two examples, both of which had the extremities colourless, but the 

 middle tinged of a delicate sherry-brown, the viscera somewhat deeper in hue ; while 

 in one was an immense egg, of a coflee-brown, almost opaque, whose appearance sug- 

 gested the probability that the species is strictly oviparous. The acute hooked proboscis 

 is very conspicuous. The corona, scarcely divided, is not wider than the neck at the 

 antenna, and this neck is not swollen into a collar. Tlie penultimate spurs are very 

 minute cones, whose bases are not separated by an interspace. The whole central 

 body is indented with longitudinal furrows. The mallei are destitute of visible teeth. 



The animal is remarkably sluggish, rarely swimming, but turning its head slowly 

 and aimlessly from side to side. 



Length. When extended, v,'^ inch. Habitat. Woolston Pond. P. H. G.] 



Callidina symbiotica, Zelinka (205), (PI. XXXII. fig. 12). 



SP. CH. Body of sixteen segments, longitudinally furroiccd, colour reddish, intes- 

 tine a deeper yellowish-red ; teeth tiuo in one ramus and three in the other ; oesophagus 

 without a loop ; corona large, willi a short peduncle ; upper lip notched, so as to have 

 two little flaps ; spurs short ; two toes, each ending in five minute hollow prominences. 



' Mr. Gosse says : " These [the toes] are often retracted in various degrees, even when the toot is 

 otherwise extended." — Evenings at the Microscope, p. 300. 



