DINOCHARID^E. 75 



follow the arch of the dorsal. I detected four vibratile tags (fig. 46) on each side : 

 one near the top of the lorica one about the middle, and two on a plexus of tubes 

 lower down. The muscles that pass down the foot to move it and the toes are very 

 conspicuous and are coarsely striated ; and the condyles of the toes (fig. 4c) are remark- 

 able. The nervous ganglion (figs. 4, 4cd) is so extremely transparent, that in can hardly 

 be detected except by a chain of dark spots round its lower edge, which betray its pres- 

 ence when it moves. It is very long, cylindrical, with a rounded free end, and lies 

 across the mastax and eye (fig. 4d). It may possibly be attached to both. Two rocket- 

 headed antennae can be seen, one on each side of the dorsal surface (fig. 4), and about 

 one-third of its length from its base. I am indebted to Mr. J. Hood for the numerous 

 specimens of this beautiful creature which enabled me to make drawings of it from 

 various points of view, and to supplement the details given by Mr. Gosse. 

 Length, ^ r inch. Habitat. Pools near Blairgowrie (J.H.) : very rare. 



Genus STEPHANOPS, Ehrenberg. 



[Lorica cylindrical or pyriform, entire ; head bearing a permanent, wide, circular 

 shield ; toe (or toes] often surmounted by a toe-like tail. 



The species which constitute this well-marked group are in general easily recognized 

 by the beautful glassy shield which protects the head, and which, seen dorsally, in- 

 stantly recalls the ring of glory which surrounds the heads of sacred persons in medieval 

 pictures. This differs from the frontal hood in the Coluridce, by being non-retractile, 

 and having no motion apart from the whole head. Several of the species have spines 

 affixed to the lorica or to the foot. The foot is habitually exserted, composed of joints 

 which are stout, long, and distinct. P.H.G.] 



S. LAMELLARIS, Ehrenberg. 



(PL XXI. fig. 7.) 

 Steplianops lamellaris . . . Ehrenberg, Die Infus. 1838, p. 478, Taf. lix. fig. 13. 



[SP. CH. Lorica pyriform, having a narrow neck, and slightly prolonged behind 

 into three siib-parallel slender acute spines ; foot furnished with a toe-like spine. 



The form is swollen and vase-like, with a marked everted rim or neck, within which 

 the whole head has a slight motion, surmounted by its lovely round glory-shield, which 

 equals the lorica in breadth. Under its shelter is seen the conical front with its rotat- 

 ing cilia, its oblique points, and its two ruby eyes, very wide apart. Below the rim or 

 neck the trophi are conspicuous, formed on the pattern seen in Euchlanis. The viscera 

 are normal, including an ample transversely-ovate contractile vesicle. The hind part 

 of the lorica is deeply truncate, and the three spines are limited to the dorsal end. The 

 foot consists of three joints, long, and strongly marked, of which the last (save the toes) 

 carries a very slender spine seated on a tubercle on its dorsal side, not quite so long as 

 the two toes. The foot joints are permeated with two long chain-like glands. P.H.G.] 



Length, T J,j inch. Habitat. A garden tub (P.H.G.) : rather scarce.' 



S. MUTICUS, Ehrenberg. 



(PI. XXI. fig. 6.) 

 Steplianops muticus . . . Ehrenberg, Die Infus. 1838, p. 479, Taf. lix. fig. 14. 



[SP. CH. Lorica cylindric, having a distinct thick neck, and prolonged behind into 

 a spoon-like shield, which is unarmed, as is also the foot. 



What I identify with Ehrenberg's muticus agrees better with his description and 

 figures than with Eckstein's. Can the latter have made his drawing from two indivi- 



