520 
VERMES. 
in the tube-forming Rotatoria ihecata^'^ Floscularia and Melicerta^ 
and points out the difference of structure between these two types ; 
F. campanulata and M. pilula are figured. The latter builds its tube 
of its own fecal pellets, while M. tyro, Huds. (hardly a Tubicolaria, 
Ehrbg. [8]), has a gelatinous one. U'he characters of Euchlanis are 
rectified, with special reference to the vibratile disc and the lorica, by 
Hudson (3) ; the 2 species named above are figured. The same author 
(4) discusses the relations of Rotatoria with Arihropoda through Peda- 
lion and other forms [cf. Zool. Rec. ix. p. 419], and (6) describes and 
figures the males of Floscularia campanulata, Lacinularia socialis, and 
AsplancTina sp. n., and both sexes of Notommata hrachionus\ out of 
5 families of Rotifers, therefore, 4 are dioecious with “ atrophied ” males, 
the Fhilodinea being the only one of which males are still unknown. 
The male of a Melicerta (tyro ?) is also figured (8). Cephalosiphon limnias 
(7) is, in spite of its single dorsal antenna, which it uses in hooking 
or hoisting itself partially out of its tube, “ a genuine Melicertan, form- 
ing a tube from early youth, and not a temporarily enclosed Philodine.’’ 
Callidina vaga, sp, n., Davis (2). According to this observer. Rotifers 
owe their faculty of reviving, after having been artificially dried up, to 
a gelatinous secretion hardening into a thin shell and protecting them 
against absolute desiccation. 
1. Ludwig, H. Ueber die Ordnung Gastrotricha, Metschn. Z. wiss. 
Zool. x:s(:vi. pp. 193-225, pi. xiv. 
2. Ragensteghbk, H. A. Echinoderes sieboldU. Op. cit. xxv. (Suppl.) 
pp. 117-123, pi. vU. 
3. Parfitt, E. On Anchisteus plumosus. M. Micr. J. ix. pp. 210&211, 
pi, XV. 
Echinoderes (2) is more nearly allied to Arthropoda than to Nema- 
toda, and in certain respects comparable to Rotatoria (E. sieboldi, Pag-, 
1. c., Balearic Islands). Ludwig (1) is led to similar results concerning 
the Gastrotricha (e g., jehthydium podvra and I. lens, the 2 species 
examined by the author), as intermediate between Rotatoria a»d Ne- 
matoda. The order is thus characterized, “ worm-shaped animalcules 
with a distinct ventral surface ; alimentary tube straight, running fore 
and aft, divided into an anterior muscular and a posterior celluligerous 
portion ; mouth and vent ventral ; body invested with a cuticle, support- 
ing various a ppendicnlar organs ; cilia commonly on the ventral surface 
only, rarely on the entire head ; posterior extremity commonly furcate ; 
no distinct nervous system ; hermaphrodite ; propagation without me- 
tamorphosis, through summer and winter eggs.” 13 species are known, 
distributed into 5 genera ; Jehthydium (5s Chcetonotus), Chceturaj Ce^ 
phalidium, Turbinella, and Dasydites. 
Anchisteus, a worm-like animalcule, found in the mucous matter sur- 
rounding Hcematococcus ; skin wrinkled, with many plumose and brush- 
shaped spines ; six pairs of bundles of single spines anteriorly, and 
