190 Prof. H. James-Clark on the Spongi^e ciliatae 



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 fullj 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. 33*, 33^, 33*^, c, c^) its aperture (c^) almost closes 

 when the body is retracted (fig. 33*=) , and dm'ing the protrusion 

 of the latter its rim (fig. 33^, 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 ^jet^ice? {jjd) is less than half its length, 

 and from that it varies down to little (figs. 33^, 33'=, pd) or no- 

 thing ; but when the former is full-grown (fig. 33, c) the latter 

 {pd) is at least half as long as it. 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 (r). 



§ 5. CoDONCECA, nov. gen.* 

 Codonoeca costata^ nov. sp. PI. 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- 

 oeca gracilipes. Generically it differs from Bicosoeca (§§ 3 

 & 4) in having neither a basal retractor muscle, nor lip, nor 

 lateral longitudinal furrow, and by the attachment of its 

 single flagellum {f) to the central point of the front. From 

 Salpingoeca (§§ 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 Dinohryon, since that, as Clapar^de 

 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. Dinohryon has a slightly notched 

 asymmetrical front ; in fact it is a calyculated Euglenian. The 

 general tint of the body of Codonoeca costata is a dingy yellow, 

 whilst the calyx (c) is colomdess and excessively transparent. 

 The shape of the body is oblong, rounded posteriorly, and 

 slightly pointed in front, where the flagellum {Jl) is attached. 

 Its posterior half nearly fills the basal third (c^) of the calyx. 



The fiageUum {Jl) has not that rigid carriage which is so 

 characteristic of that of Bicosoeca (§§ 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 

 * KcoSwi/, a bell ; otKew, to inhabit. 



