ON HEBRIDEAN CRUSTACEA, ECHTNODERMATA, POLYZOA, ETC. 195 



ahdominalis, Kroyer, and PUurocrypta GalatJiece, Hesse : the first was found 

 imder the carapace of Doryplwrus Gordoni ; the second under the abdomen of 

 Hippolyte securifrons, Norman, and H.pusiola, Ki'oyer ; and the Pleurocrypta 

 was buried under the carapace of Galathea intermedia, Kroyer ( = (?. dispersa. 

 Bate). 



Ostracoda were obtained in extraordinary abundance, and inchided no less 

 than sixty-five species. This number will, perhaps, be the more appre- 

 ciated if I refer to the fact that the total number of forms of this order of 

 the Crustacea described in ' Baird's History of British Entomostraca ' only 

 amounts to nineteen. Mr. G. S. Brady, who is engaged in preparing a mono- 

 graj^h of these bivalve Crustacea, will present a separate report on the species 

 met with ; but I may here mention that thirty-seven are either wholly new 

 to science, or, what is stUl more interesting, species previously known as 

 Tertiary and post-Tertiary Fossils, and now for the first time met with in a 

 recent state, or such as have been described by Norwegian naturalists from 

 the Scandinavian seas. 



A number of Copepoda recently described by Clans, were also met with. 

 These include many genera which were previously unrecognized in our fauna : 

 — the genus Dactylopus, represented by tishoides, Stroemii, tenuicornis, cinctus, 

 and hrevicornis ; Thalestrls, embracing mysis, Helgolandica, harpacticoides, 

 and hngimana ; Longipedia coronnta (a very curioi;s and interesting form), 

 Eupelte gracilis, Clefa serrafa, and PorceUklium Jimhriatum and dentatum. 

 At Tobermory was discovered Dyspontius striatus, Thorell, a very remarkable 

 genus with an enormously developed proboscis, which is almost equal in 

 length to the rest of the animal. 



A small freshwater loch near Stornoway contained, among other species, 

 Drepanothrix hamata, G. 0. Sars, a genus allied to Macrothrir, which may 

 be at once distinguished from aU allies by the presence of a largely developed 

 spine in the middle of the dorsal margin of the carapace. It is now first 

 announced as British, but has been previously taken by myself in Darden 

 Loch, Northumberland, and by Mr. G. S. Brady in St. Mary's Loch, Selkirk- 

 shire. 



The Echinoderms number thirty-four species. In addition to the common 

 Antedon rosaceus, Linck, Antedon Celticus of Barrett was procured in deep 

 water, both in the Minch and in Sleat Sound. This very fine species was 

 previously only known to us from the two type specimens dredged by Messrs. 

 MacAndi-ew and Barrett ten years ago in the Sound of Skye, and described 

 in the ' Annals of Natural History ' *. It is the largest member of the genus 

 found in our seas, and is distinguished at a glance from rosaceus, Milleri, 

 and Sarsii by the great length of the slender dorsal filaments, and also by 

 the vertical position which the arms assume. In this pecuharity it resembles 

 Antedon Eschrichtii, but diflfers from the other English species, in which the 

 arms are always carried horizontally, or nearly so, and are incapable of 

 being brought into contact with each other throughout their entire length. 

 Only a few specimens were met with in Sleat Sound, and these were as- 

 sociated with A. rosaceus. In the Minch A. Celticus occurred gregariously, 

 living in about sixty fathoms, in company with another rare British Echino- 

 derra, Holothuria intestinalis, Ascanius. The only previously known British 

 example of this species was procured many years ago by Professor Forbes 



* Comatula Woodwardii, Barrett (Ann. Nat. Hist. 2ncl series, vol. xix. p. 33, pi. 7. 

 fig. 1), Comatula Celtica, Barrett (Ann. Nat. Hist. 2nd series, vol. xx. p. 44), Antedon 

 Celticus, Norman (Ann. Nat. Hist. 3rd series, vol. XT. p. 104). 



t Trans. Eoy. Soc. Edinb. vol. xx. p. 309, pi. 9. fig. 1. 



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