306 Miscellaneous. 



Eevision of the Nematonh of the Gulf of Marseilles. 

 By M. A. V. Marion. 



The recent note by M. Villot on the prripheral nervous system 

 of the Xematoids deterniines mo to deter no longer some rectifications 

 ■whicli 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 oceanic Xematoids a remarkable ner- 

 vous network identical with that which he has described in Gordius. 

 This interesting publication greatly modifies the notions that we had 

 lis to the sensor}- apparatus of these little worms. It is only neces- 

 sary to glance through Bastian's im])ortant memoirs (Phil. Trans. 

 18G6, p. 505, and Trans. Linn. Soc. 18(!5, part '1, p. 8:3) in order to 

 see how unsettled this question remained. I hope to resume this 

 anatomical investigation upon the species of the Ktang de Berrc, and 

 to profit by the statements of M. Villot. It is desirable to determine 

 exactly the nature of that oesophageal 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, Sieiwlaimus, 

 Heterocephahis, Thoracostoma, and Enoplostoma are synonymous 

 with his genera Symjilocostoma, Anticoma, Phanoderma. Liptoso- 

 matum, and Enophis. It is difficult to compare the species with a 

 transversely striated cuticle. I recognize in Bastian's figures various 

 toguraentary 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 Litsiomitus, Eurystoma, Necilconema, lihab- 

 dotodeiina, and Accinthophan/n.v may therefore be retained. I may 

 add that St/yyijilocostoma hnr/icolUs, Bast., is probably the same worm 

 that I have called Amphi.'ifenus agilis, and which does not differ 

 from the Enoplus temdcollis of Eberth. In the same way Hetero- 

 cephalus latlcoUis, Mar., is identical with Phanoderma Cochsi, Bast., 

 the supplementary penial plate of which is not represented in the 

 plates of the monograph of the AnguiUulidae. 



To the same species I do not hesitate to refer the Enoptlus tnher- 

 culatus of Eberth. Bastian gives new characters for the genus 

 EnophiS 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 Enoplus communis, 

 Bast., of the English coasts. It is impossible to separate from this 

 species Enoplus macrophthalmus, Eberth, E. Dujardinii, Bast., and 

 E. pigmentosii^, Bast. Lastly Thoracostoma ediinodon, Mar., is syno- 

 nymous with Lepjtosomxitum Jiguratum, Bast. 



It is evident to me that many Nematoids inhabit both the 

 ocean and the Mediterranean. The four species just cited {Sym- 

 plocostoma longicoVis, Phanoderma Coclrsi, Enoplus communis, and 

 Leptonomatum Jigurutuin), observed by Bastian on the shores of the 



