Prof. H, Fol on the Family Tintinuodea. 247 



rior extremity truncate, constituting a discoidal peristome, 

 hollowed out like a saucer, garnished with motor cilia at the 

 marffin, and with short cilia towards the interior. Cilia of 

 the peristome all arranged in accordance with about twenty- 

 curved lines, starting from the interior of the disk to become 

 tangents to the margin of the peristome. Mouth large, 

 excentrical • pharynx furnished with cilia bj the prolongation 

 of some of the rows of cilia of the disk. Nucleus situated in 

 the anterior part of the body ; contractile vesicle towards the 

 middle of the body ; anus near the point of insertion of the 

 peduncle. Conjugation and internal formation of embryos 

 observed in various species. 



Genus 1. TiNTiNNUS, Schrank. 



Test smooth, firm, chitinous, transparent, free from foreign 

 bodies. 



Tintinnus ampulla^ sp. n. 

 (PI. XVII. figs. 1-3.) 



Test ovoid, terminated postei-iorly by a slight projection in 

 the form of a point, widely open above, where a widened, 

 funnel-like portion is superposed upon the ovoid part. The 

 widened portion composed of two zones, of which the superior 

 is more turned out than the inferior one. At the boundary 

 between the two zones, on the inner surface, there is a slight 

 circular projection notched into the likeness of an arcade, 

 liines of cilia on the peristome to the number of twenty-four. 

 Body smooth. Length of the test 0'087 millim. ; diameter at 

 the entrance 0'081 millim. 



This species is the commonest of those that I have met with 

 at Villefranche-sur-Mer. I have seen hundreds of it in the 

 produce of my fishings. 



Tintinnus spiralis, n. sp. 

 (PI. XVII. fig. 4.) 



Test greatly elongated, pointed, drawn out ; the posterior 

 third nearly cylindrical over a certain extent, very narrow, 

 terminated by an acute point ; the anterior two thirds in the 

 form of an elongated cone, slightly inflated ; near the orifice a 

 thickening in the form of a cushion projecting outwardly. 

 Test composed of two very distinct layers, presenting at the 

 surface some faintly-marked and somewhat irregular striae, 

 generally parallel, oblique to the axis of the test, and describing 

 very elongated dextrogyrous spirals ; small points arranged 

 in spiral lines parallel to the strise, and alternating with them. 



