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Show 202 DR. T. s. C O B B O L D O N ENTOZOA. [Feb. 1, of this narrow but well-marked band are worthy of further study. believe the parasites were all males; but I was unable to detect the external sexual openings. 9. ECHINORHYNCHUS TRANSVERSUS (Illld.) On the 18th of Febuary, 1875,1 received from Dr. Hooker, Pres. R.S., eleven examples of a small acanthocephalus worm for identification. They were obtained by his son, Mr. Charles P. Hooker, who subsequently informed me by letter that he had found them in a Redwing (Turdus iliacus) which he dissected on or about the 5th of January, 1875. It was also mentioned that the worms occupied the large intestine, probably to the number of one hundred in all. Hitherto this parasite has been found abundantly in the Blackbird, Thrush, and in most of the Turdida ; but not, I believe, in the Redwing. It has also been obtained from the Starling and Redbreast. The occurrence of so many of these armed parasites in one host is a noteworthy circumstance; and it is difficult to understand how they could be present in such numbers without inflicting severe injury on the bearer. Of course there is no proof that the bird did not suffer inconvenience: at all events, analogous facts of parasitism produced by other species of Echinorhynchi show that these Entozoa are occasionally productive of fatal results. 10. ECHINORHYNCHUS ECHINODISCTJS (Diesing). On the 1st of November, 1875, I received from Prof. Flower, F.R.S., a glass jar labelled as follows, "Entozoon found attached to intestine of the Tamandua x\nt-eater." The parasite was obtained from the Society's Gardens on the 12th of August, 1871. The Brazilian traveller, Natterer, originally obtained this worm from Myrmceophuga jubata and M. bivittata. Creplin described it from a M. didactyla from Surinam (Wiegmann's Archiv, 1849). I presume the M. tamandua answers to the M. bivittata of Geoffroy, as well as to the tridactyle and tetradactyle species of Linnseus. The parasite in question appears to have been solitary. It is a female, measuring exactly 10 inches long. The annulations of the body commence about | an inch from the head, and are continued on uninterruptedly with great regularity to the end of the tail. On the average, twenty rings may be counted to the inch; thus there are quite 200 altogether, as they are somewhat more closely packed towards the neck and also at the tail. The proboscis was firmly anchored within the gut; and I was unsuccessful in my attempt to dissect it out entire. For a space of \ of an inch in diameter at the point of anchorage, the intestine was opaque from inflammatory exudation. 11. ECHINORHYNCHUS ELEGANS (Diesing). Six or eight years back, Dr. Murie placed in my hands a glass jar containing eight parasites. I could not examine them at the time; but on the 18th of April 1873 I made a careful study of the worms, briefly noting down the principal facts of structure. Although the |