190 Prof. H. James-Clark on the Spongie ciliate 
minute, but with nothing remarkable in its action, unless it be 
that it operates more moderately than in Monas. 
The calyx (c) has, in its fully developed condition, about the 
same shape and proportions as that of the marine form (figs. 34, 
35), but, like the body, it is much larger. In its younger 
stages (figs. 334, 33>, 33¢, c,c!) its aperture (c') almost closes 
when the body is retracted (fig. 33°), and during the protrusion 
of the latter its rim (fig. 334, c!) embraces it very closely, so 
that on the whole the calycle has an elongate-ovate shape, with 
a narrowed, truncate, smooth margin. During the undeveloped 
stages of the calyx, the pedicel ( pd) is less than half its length, 
and from that it varies down to little (figs. 334, 33°, pd) or no- 
thing ; but when the former is full-grown (fig. 33, c) the latter 
(pd) is at least half as long asit. It is more slender than that 
of B. gracilipes, and, like the latter, is attached to the base of 
the calyx opposite to the insertion of the retractor ligament (7). 
§ 5. Coponaca, nov. gen.* 
Codoneca costata, nov. sp. Pl. V. fig. 36. 
Of all the calyculate Flagellata, the species before us is 
perhaps by far the most beautiful, both in physiognomy and 
proportions. It is a marine form, and was found with Bicos- 
aca gractlipes. Generically it differs from Bicoswca (§§ 3 
& 4) in having neither a basal retractor muscle, nor lip, nor 
lateral longitudinal furrow, and by the attachment of its 
single flagellum (f2) to the central point of the front. From 
Salpingeca (§§ 7, 8, & 9) it differs principally in not possessing 
a projecting collar or rim about the anterior end; but, as in 
that genus, the body is not attached to the calyx by any visible 
means. It cannot be a Dinobryon, since that, as Claparéde 
has already shown, has but a single contractile vesicle, and, 
moreover, it is situated near the anterior end of the body, and 
just behind a red eye-spot. eRe ahs has a slightly notched 
asymmetrical front ; in fact it is a calyculated Euglenian. ‘The 
general tint of the body of Codonewca costata is a dingy yellow, 
whilst the calyx (c) is colourless and excessively transparent. 
The shape of the body is oblong, rounded posteriorly, and 
slightly pointed in front, where the flagellum (//) is attached. 
Its posterior half nearly fills the basal third (c*) of the calyx. 
he flagellum (fl) has not that rigid carriage which is so 
characteristic of that of Bicosewca (§§ 3 & 4) and Anthophysa 
(§ 11), but is a truly vibratile organ. It is kept in an almost 
constant state of rapid agitation, and projects at the same time 
far beyond the rim (c!) of the calyx. It is by no means easy 
* xodwv, a bell; oixéw, to inhabit. 
