69(3 



SYSTEMATIC HISTOEY OF THE i:?fFrSOIlIA, 



as described by Ehrenberg. Dorsal and ventral plates united along the sides, 

 forming an acute ridge, leaving a fissnre, posteriorly, for the foot. Dorsal plate 

 the largest. Frontal portion of the animal retractile within the lorica ; deeply 

 cleft on its ventral aspect, with the oral orifice at the bottom of the cleft. 

 Expanded anteriorly into lappets supporting hooked bristles. On either side 

 is a conical process terminated by a long stiff seta. Oesophagus capacious ; 

 jaws resembling those of Hydatina and Brachionus. Stomach thick and 

 rounded, with two small spherical glands. Intestine pyriform, ending in a 

 cloaca at the posterior border of the ventral plate ; both ciliated. Contractile 

 vesicle opening into the cloaca, sending up on each side a coiled water-vessel 

 with about four vibratile tags. Longitudinal muscles strong, striated. A large 

 trapezoid cellulo-granular organ in the head, with a red speck near its front 

 extremity, and on each side a long, finely granular saccular appendage. Tail 

 with three telescope segments, ending in two long knife-hke toes. 



Dujardin does not admit the genus Mo'iwsfyla, but places its three species 

 in the present one — Euchlanis. 



EuCHL-Ajsris(?) triquetra (xxxvin. 5 a). 

 — Lorica very large, trilateral, with a 

 dorsal crest ; setae on foot, none. This 

 species is very diaphanous ; and " there- 

 fore," remarks Ehrenberg, " I was never 

 able to see the line of division on the 

 ventral surface of the lorica. The rela- 

 tionship of the fibres of the lateral 

 muscles is physiologically and anatomi- 

 cally interesting : they form three bun- 

 dles, on each side, and show as distinct 

 corrugations as do the muscles of larger 

 animals." (xxxiv. 443, a fore-shortened 

 xiQ-w ; 442, a left side view, shoTvdng 

 the dorsal crest of the lorica : at the 

 base of the foot an external empty fold 

 of the skin is visible. Fig. 441, the ven- 

 tral surface, showing an opening for the 

 foot, but no division of the lorica ; 

 444, the teeth and jaws separated.) In 

 turf-pools. Length 1-48" ; ovum 1-192". 

 (xxxviii. 5.) 



E. (?) Hornemanni. — Lorica thin, 

 short, cup-shaped, truncate in front, the 

 anterior part of the body soft (pliant) 

 and elongated. This creature appears 

 able to draw within the lorica both 

 foot and head. Sometimes longitudinal 

 muscles are apparent. 1-432" to 1-240". 



E. Luna (Cercaria Luna, M.). — Lorica 

 cup-shaped, the front excised in a lunate 

 manner, toes with claws. The single- 

 toothed jaw, the constriction of the ali- 

 mentary canal, and the claws distinguish 

 it from the other species. Amongst 

 CeratopIujIIum and Confervae. 1-144". 

 According to Perty, specimens occur of 

 a rosy red colour. 



'E.' 7nacrura. — Lorica large, ovate, de- 

 pressed ; bristles at the base of the foot ; 

 toes long, styliform. This species is di- 

 etinauished from the foUowmg one by 

 its stronger and longer toes. " Lately," 



says Ehrenberg, " I saw the division of 

 the lorica along the ventral sm*face." 

 Each jaw has five teeth ; and there are 

 two soft maxillary appendages, each with 

 two teeth. Amongst Confen'se in clear 

 water. Length, without foot, 1-96". 

 Perty states that the stomach and in- 

 testines are sometimes red. 



E. dilatata {Brachionus, M.). — Lorica 

 broad, depressed, folded on the mider 

 side ; foot without setae : toes long. 

 This animalcule, when it emerges fi-om 

 the e^^, has a veiy soft lorica, and re- 

 sembles Notommata. Cohn states that 

 the males of E. dikdata are like the 

 female, only smaller and more slender^ 

 as well as more transparent from the 

 absence of mouth, oesophageal bulb, and 

 intestine. The testis of the male occupies 

 the centre of the body, and is a lancet- 

 like elongated sac (xxxix. 5 ?i), extend- 

 ino; from the cloaca to the cerebral 

 ganglion, and filled with rod-like sper- 

 matozoa. At its posterior extremity it 

 is in connexion with a reuiform body 

 surroimding and opening into the penis. 

 The latter has a thick wall and a ciliated 

 canal protruding as far as the first seg- 

 ment of the tail (5 p e). Length of 

 lorica 1-8"' to 1-20"' (figs. 4, 5, 7). 



E. LynceKS. — Lorica ovate, turgid, 

 deeply fiuted ; two little horns project 

 anteriorly, (xxxiv. 445, a back view ; 

 and 446, a side view) ; the lorica is open 

 along the middle of the imder side. 

 Length of lorica 1-216". 



E. defexa (Gosse). — Body semioval ; 

 ventral surface of the lorica divided lon- 

 gitudinally, and the edges of the fissure 

 bent out at right angles ; foot furnished 

 with two pairs of bristles ; toes spindle- 

 shaped. Lorica 1-80". 



E. pyrifornus. — Outline (viewed dor- 



