306 _ Miscellaneous. 
Revision of the Nematoids of the Gulf of Marseilles. 
By M. A. F. Marion. 
The recent note by M. Villot on the peripheral nervous system 
of the Nematoids determines me to defer no longer some rectifications 
which I intended for a general memoir on the mode of distribution 
of the marine animals of the gulf of Marseilles. M. Villot indicates 
in the hypodermal layer of the oceanie Nematoids a remarkable ner- 
yous network identical with that which he has described in Gordius. 
This interesting publication greatly modifies the notions that we had 
as to the sensory apparatus of these little worms. It is only neces- 
sary to glance through Bastian’s important memoirs (Phil. Trans. 
1866, p. 565, and Trans. Linn. Soc. 1865, part 2, p. 83) in order to 
see how unsettled this question remained. I hope to resume this 
anatomical investigation upon the species of the Etang de Berre, and 
to profit by the statements of M. Villot. Itis desirable to determine 
exactly the nature of that esophageal ring that Bastian refers to the 
glandular system. ‘The rectifications that I shall now present relate 
solely to the systematic arrangement of the species of the shores of 
Marseilles. 
The groups that I formerly proposed correspond exactly with 
those established by Bastian. My genera Amphistenus, Stenolaimus, 
Heterocephalus, Thoracostoma, and Enoplostoma are synonymous 
with his genera Symplocostoma, Anticoma, Phanoderma, Leptoso- 
matum, and Hnoplus. It is difficult to compare the species with a 
transversely striated cuticle. I recognize in Bastian’s figures various 
tegumentary adornments that I have observed on the Nematoids 
of Marseilles; but the buccal and penial armatures appear to differ 
completely, although their details are not always very distinctly re- 
presented. The genera Lasiomitus, Eurystoma, Necticonema, Rhab- 
dotoderma, and Acanthopharynx may therefore be retained. I may 
add that Symplocostoma longicollis, Bast., is probably the same worm 
that I have called Amphistenus agilis, and which does not differ 
from the Hnoplus tenuicollis of Eberth. In the same way Hetero- 
cephalus laticollis, Mar., is identical with Phanoderma Cocksi, Bast., 
the supplementary penial plate of which is not represented in the 
plates of the monograph of the Anguillulide. 
To the same species I do not hesitate to refer the Enoplus tuber- 
culatus of Eberth. Bastian gives new characters for the genus 
Enoplus of Dujardin, from which he excludes the freshwater worms. 
The group thus limited corresponds to my genus Enoplostoma. 
Enoplostoma hirtum of Marseilles is the same as Hnoplus communis, 
Bast., of the English coasts. It is impossible to separate from this 
species Enoplus macrophthalmus, Eberth, E. Dujardinii, Bast., and 
E. pigmentosus, Bast. Lastly T’horacostoma echinodon, Mar., is syno- 
nymous with Leptosomatum figuratum, Bast. 
It is evident to me that many Nematoids inhabit both the 
ocean and the Mediterranean. The four species just cited (Sym- 
plocostoma longicollis, Phanoderma Cocksi, Enoplus communis, and 
Leptosomatum figuratum), observed by Bastian on the shores of the 
