OF THE EUCHLANIDOTA. 



697 



sally) nearly oval^ with a slight con- 

 striction in' the middle 5 lorica divided 

 longitudinally along the ventral surface, 

 the gape widening anteriorly; toes pa- 

 rallel, edged ; eye minute. Lorica 1-62". 



E. Hipposicleros. — Nearly oval in out- j 

 line ; the ventral side flat ; the dorsal j 

 greatly arched, and ridged down the j 

 middle ; lorica foi-med of two distinct i 

 plates ; the dorsal plate enveloping the j 

 back and half down the sides ; the ven- 

 tral separated from it by a wide space, 

 and hollowed in the middle, so as to 

 present the figure of a narrow horseshoe, 

 whose points are forwards: foot anned 

 with one pair of bristles. Lorica 1-110". 



E. emarginata (Eichwald). — Distin- 

 guished from E. Luna by a projection at 

 the end of each tail-flap. 



E. hicariiiata (Perty). — Body elon- 

 gated. Dorsum of lorica with two 

 parallel keels, rounded behind. Tail 

 long, with two terminal pincers; body 

 wide in the middle, contracted towards 

 each end. Middle joint of the tail very 

 long ; toe-segment very short. Eye 

 blackish-red. It is allied to E. Weissii 

 of Eichwald, but distinguished by its 

 long figure and long setae of tail. 1-6'". 

 Perty believes that this species connects 

 Euchlanis with Salpina. Leydig regards 

 it as a Salpina. 



E. unisetata (Leydig.) — Size of E. cli- 

 latata. It has a single long bristle located 

 on the dorsal surface of the foot-articu- 

 lation ; and, according to Leydig, the eye 

 has a refracting lens (xxxvin. 18). 



Genus SALPINA (XXXIY. 447-453).— Eye single, cervical ; foot fui-cate ; 

 lorica prismatic, with bulging sides, closed below, and terminated by spine- 

 like processes or teeth. " The lorica," says Ehrenberg, " resembles a three- 

 sided little casket, with arched sides, flat below, and having, anteriorly and 

 posteriorly, at the truncated extremities, little points." The animalcule can 

 entirely withdraw itself \\ithin the lorica. AU the species have an elevated 

 ridge upon the back, which in some appears to be double. A compound 

 rotary organ, two short anterior lateral, and two foot muscles are seen in 

 S. mucronata. An oesophageal head, with thi'ee- or four-toothed jaws, a 

 short oesophagus, and a simple conical alimentary canal exist in aU the 

 species ; in five the conical intestine has two spherical glands. The ovary- 

 is distinct. A spur or tube is observed at the neck in three species ; the red 

 eye in connexion with a cerebral ganglion is always present. They do not 

 increase in large masses. 



Salpina imicronata (^Brachionus mu- 

 cronatus, M.). — Lorica very minutely sca- 

 brous, anteriorly with four, and poste- 

 riorly with three horns, generally straight 

 and of equal length. The lorica, when 

 the creature is yomig, is soft and bent, 

 but soon hardens, and produces horns. 

 The spur, or tactile tube, in the neck, 

 temiinates in a little bristle, as seen in 

 XXXIV. 450. In some specimens, Ehr- 

 enberg says, the lorica appears as if 

 punctate or stippled. (447, 448, full- 

 grown specimens, with the head vdth- 

 di-awTi ; the latter figure is a back view, 

 the former an under one ; 449, a side 

 view, head extended; 451, an egg just 

 deposited on Lemna ; 452, an egg vnih. 

 the young vibrating ; 450, the young 

 one just escaped from the shell; 453, 

 the teeth separately.) Length of lorica 



S, spinigera. — Lorica with four frontal ! 

 and three posterior horns ; the posterior j 

 dorsal one longest, and a little recurved, i 



Among Ceratophylla. Length of lorica 

 1-140" (xxx\T:n. 23, 24). 



S. ventralis. — Lorica stippled, horns 

 two in front, three behind, the dorsal 

 one short and decm-ved. According to 

 Perty, a faint lens seen in the eye. 

 Amongst Confervse, &c, 1-120". 



S. redunca. — Lorica smooth, horns two 

 in front, three behind ; two of the latter 

 (the under ones) hooked, the dorsal crest 

 bifid and gaping ; teeth fom* to each jaw. 

 Amongst Confervse. 1-200". 



S. hrevispina. — Lorica milky and tur- 

 bid, but appearing bright; scabrous, 

 horns two (small) in fi'ont, and three 

 behind, short dorsal crest not gaping ; 

 respiratory tube unknown. Amongst 

 Ceratophylla, 1-144". 



S. hicarinata. — Lorica smooth, lionis 

 fom- in front, three behind, short ; neither 

 lateral muscles nor respiratory tubes 

 known. 1-216". 



S. spinigera, S. ventral is, S. redunca, 

 and 'V. hicarinata are probably slightly 



