274 THE AMERICAN MONTHLY [December, 



Hyptopus, which often reaches i-yoth inch long. Towards the 

 head the animal becomes constricted, forming a well-marked 

 neck, only about one-third the width of the body at its widest 

 part ; this gives it a flask-shaped appearance and distinguishes it 

 at once from Hyptopus. The body is greatly compressed later- 

 ally, more so than in Hyptopus, but widening slightly at the 

 lower extremity. The ciliary wreath is simple and small and 

 propels the animal rather slowly and deliberately through the 

 water, while Hyptopus is a veiy brisk and active swimmer. 



The brain is a very large hyaline sac, having some white, 

 opaque granules at the tip, and just in front of these a large, 

 square, crimson eye. The mastax, situated below the brain, is 

 large and transparent, and contains forcipate trophi with four 

 prongs. The stomach is very large and saccular, filling the 

 whole of the body cavity, and containing a quantity of green and 

 brown food. It is very difiicult to distinguish the other organs, 

 owing to the size of the stomach ; a sausage-shaped hyaline organ 

 near the foot looked like the ovary. 



The small foot appears two-jointed, and protrudes high up from 

 the narrow ventral surface, giving a very uncommon and odd ap- 

 pearance to the creature. The integument is yellowish in color, 

 transparent, and rather stiff"; it might almost be called a lorica. 

 Near the foot is a small contractile vesicle, and also one vibratile 

 tag. Eggs were not observed. 



Summarizing the specific characters : The body is flask-shaped, 

 much constricted anteriorly, forming a cylindrical neck, greatly 

 compressed laterally ; ciliary wreath small and simple ; foot very 

 small, arising from the ventral surface, carrying two small pointed 

 toes, and capable of being completely retracted ; trophi forcipate, 

 integument leathery, transparent, and yellowish ; size, i -250th to 

 i-zyoth of an inch ; habitat, Snaresbrook, Epping Forest, Eng- 

 land. 



Conochilus unicornis. — The genus Conochilus contains two 

 species, C. volvox and C. dossuaris, to which I can now add a 

 third. (Fig. 3.) I found this new species at a recent excursion 

 to Keston, and propose to name it C. iiniconiis o\\ accoimt of its 

 peculiar and prominent ventral antenna. 



The corona closely resembles that of C volvox in shape and 

 structure, by having the buccal orifice on the corona towards the 

 dorsal side a ciliated groove close within the edge, and a well- 

 marked ventral gap in the ciliary wreath, but instead of having 

 two ventral antennte widely apart as in C. volvox^ this new spe- 

 cies has only one large antenna placed on the surface of the corona 

 near the centre and surmounted by a single long and stout bristle, 

 which can be retracted somewhat within the tubular sheath ; this 

 antenna is a conspicuous feature of the corona, and at once strikes 

 the observer. Between the antenna and buccal funnel the 

 skin of the corona is raised and forms a fleshy cone ; this cone 

 has a deep groove on the dorsal side running down to the buccal 



