7. _The Whales. Louse_ (7.a) _The underside_ 8. _The East India cup shap’d Barnicle_ 9. _The Bell shap’d Barnicle_ 10. _The Red Coral Tulip Barnicle_ 11. _The pipy conical Barnicle_ (11.a) _The underside_ 12. _The Tortoise Wart_ (12. a) _The underside_ 13. _The American Crabs Wart_ (13.a) _The same sideways_ 14. _The Cape sidemouth Barnicle_ (14.a) _with_ oblique edge 15. _The Eggshap’d thick Barnicle with a small mouth_ 16. _The Cornish cone Barnicle with a small_ edge 17. _The common English Barnicle with a_ wide mouth 18. _The Greenland Limpet shap’d Barnicle_ 19. _The Slipper_ (19.a) _The same cover’d with hierophylis_ 20. _The Persian Crown_] CXIII. _An Account of several rare Species of Barnacles. In a Letter to Mr._ Isaac Romilly, _F.R.S. from_ John Ellis, _Esq; F.R.S._ [Read Dec. 21, 1758.] London, Dec. 21. 1758. Dear Sir, THOSE rare and very extraordinary new species of Barnacles, which you have lately received from abroad, are so different from any of the common species, that I have seen, that I was resolved to inquire into the nature of an animal, which, like a Proteus, appears in so many different shapes or coverings in different parts of the world. For this end I have consulted that excellent collection in the British Museum, and some others in the cabinets of my curious friends. In this inquiry I met with some very rare ones, which have not yet been described, as you will observe in the annexed plate [_See_ TAB. XXXIV.], where I have given exact drawings of yours, as well as the other species of this genus. This marine animal is called, by writers on natural history, Balanus, and Concha Anatifera: but the celebrated Professor at Upsal, Dr. Linnæus, calls the internal active part, or fish, the Animal Triton, and the covering or testaceous habitation Lepas, which he says is a multivalved shell, composed of unequal valves. The Animal Triton he describes, as having an oblong body, a mouth with a tongue in it, twisted about in a spiral manner; sixteen tentacula or claws: six of the hinder ones on each side, he says, are cheliferous. This account differing from that given by the ingenious Mr. Turberville Needham, F.R.S. in his Microscopical Essays, I shall give the character of this animal, as it appeared to me from the many observations I made on it, while alive in salt water; and these I compared not only with many dried specimens of other varieties, but likewise with some of yours, that were preserved in spirits; and I found that the parts of the animal agree in all the species.