640 
VERMES. 
and described an unnamed species found between the skin and the flesh 
of Delphinus delphis (p. 467, pi. xiii. figs. 1-8). He has further studied 
the free Nematoids of the same locality, describing as new Leptosomatum 
roscovianum^ p. 458, pi. xi. fig. 1, L. magnum (pi. xi. fig. 2), minutmn 
(pi. xi. fig. 3), Enoplus acutuSy p. 460, pi. xi. fig. 6, Fhanoderma parvuniy 
p. 462, pi. xi. fig. 7, Anticoma tenuicaudatay pi. xi. fig. 8, A. obtusay 
p. 463, pi. xi. fig. 9, Spira schneideriy p. 464, pi. xi. fig. 11, Chromadora 
cinctay pi. xi. fig. 12. Enoplus communiiy Bast., figured, pi. xi. fig. 4. 
Several of Marion’s species are referred (17) to Bastian’s genera and 
species. 
Discophoray g. n., Villot, 1. c. Buccal armature consists of 2 lateral 
discs. D. cirnhata (Eberth.), p. 463, pi. xi. fig. 10. 
Chcetosoma armatumy sp. n., Barrois (15), Koscoff. 
The so-termed ‘‘free Nematoids” are, according to Villot (3), semi- 
parasitic, affecting the vicinity of Molluscay Ascidicsy MolguUcy and Annu- 
lata, and living on their slime. They cannot be systematically separated 
from the parasitical forms \cf. Zool. Rec. xi. p 506]. 
Butschli has published a preliminary account of his researches [which, 
if confirmed, will probably profoundly influence the theory of segmenta- 
tion of the egg] on the processes going on in the eggs of the Nematoda 
during the first stages of their evolution, with suggestive comparisons be- 
tween the “ Richtungskorper ” and the “ Nucleolus (“ seminal vesicle ”) in 
Infusoria (12). The primordial embryo of Cucullanus has the shape of a 
plate, composed of 2 cell-layers ; the embryonal worm is formed through 
a plication and coalescence of this plate, one of the layers of which 
becomes the endoderm, the other the ectoderm (13). 
According to Villot (19), the subcuticular granular layer in Nema-, 
toda contains a network of ganglionic cells, furnishing nervous threads 
to the organs of touch and vision, and communicating with the central 
nervous system, as in Gordius [Zool. Rec. xi.p. 505], by means of a plexus, 
traversing the muscular layer on the ventral face. 
On a Gordius-Vd^Q animal, free at great depths in the South Pacific ; 
also parasitical in shrimps : R. V. Willemoes-Suhm, Z. wiss. Zool. xxv. 
p. xxvii. On Mermis acuminata ; Leidy, P. Ac. Philad. 1875, pp. 15 
& 406. 
Chjstognatha. 
The affinity of the Chcetognatha to the Nematoda is doubted by 
Butschli (13) & Giard (15). 
Sagitta batziana, sp. n., Giard (15) (Roscoff); S. hamatUy sp. u., 
Mobius, Vermes \_suprdy p. 521], p. 158, pi. iii. figs. 13-16 (North Sea). 
VIII. AOANTHOOEPHALA. 
Villot (3) describes 4 species of Echinorrhynchus from the marine birds 
of Roscoff :—E. inflatusy Cr., p. 471, pi. xiii. fig. 11 {Charadrius hiaticuhiy 
Tringa alpina) \ polymorphus, Br., p. 472, pi. xiii. fig. 12 {Anas sp.^ 
Tringa alpina ?) ; crassicoUiSy sp. n., pi. xiii . figs. 9 & 10 {Calidris 
