Dr. L. Orley o?i Nematodes. 301 species. Probably the larger size mentioned is tlie fullj-developecL form, although by no means the most plentiful. The bihamate is also peculiar, and so difhcult to find from its fineness and scarcity that I do not place much dependence on the form and size given of it ; hence consider that what I have stated requires confirmation. Possibly in some parts of the specimens which have not come under my observation the flesh-sjricules may be larger, more marked, and more plenti-ful ; but after a prolonged search I have not been able to find tlicm. The skeletal spicule, as in most other species, varies in the form of the head, being in one part simply acuate and in another more or less inflated (fig. 17, a, h). The speci-mens, according to the label, were obtained by Dr. Cunning-ham, after whom the species is named, and fouud at the places mentioned. They are all in the British Museum, and, besides my running no. 441, bear the register nos. 68. 6.29.22 and 72.4. 19. 3 respectively. Mr. Stuart Ridley has alluded to them (Proc. Zool. Soc. 1881, p. 117, pi. x. fig. 5) for com-parison with liis Esperia macjellanica^ the spiculation of which is of the common type. Although Esperia Cunningliami is the only species in which I have found the " inequianchorate " to present the peculiar character above mentioned, there is another in which the 6i7((aw«<e equally possesses one; and that is the serrated form in Esperia serratohamata^ found among the Gulf-of-Manaar specimens from Ceylon (' Annals,' 1880, vol. vi. p. 49, pi. v. fig. 20, i). [To be continued.] XXX. — Report on the Nematodes in the Possession of the British Museum, icith a Review of tlie Classification of the Order. By Dr. L. Orley. [Plate X.] Since the year 1853, in which Baird's ' Catalogue of the Species of Entozoa contained in the Collection of the British Museum ' appeared, the collection has been enriched by the addition of some interesting forms, the enumeration of which â– will afford matter of interest to those acquainted with the group. Our knowledge of the Nematodes has undergone such changes during the last thirty years, that a fresh survey of the collection was certainly desirable. Many species reputed
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