(el) 
II.—On some littoral Oligocheta of the Clyde. By J. Stephenson, M.B., D.Sc. 
(Lond.); Major, I.M.8.; Professor of Biology in the Government College, Lahore. 
Communicated by Professor D'Arcy W. THompson, C.B. (With Two Plates.) 
(MS. received August 11, 1910, Read November 21, 1910. Issued separately May 16, 1911.) 
CONTENTS. 
PAGE PAGE 
Introduction . : ; ; 7 : d 31 | Enchytreeus dubius, n. sp. . ‘ 5 : : 54 
Tubifex costatus, Clap. : ; ; : 33 | Enchytrzeus sabuiosus, Southern . ; : : 58 
Marionina semifusca, Clap. . ; ; : : 35 | Enchytreeus albidus, Henle : : ‘ ; 59 
Lumbricillus subterraneus, Vejd. . : : 39 | Fridericia bulbosa, Rosa ; : : : F 61 
Lumbricillus tuba, n. sp... : : 42 | Literature . : : : ; . : : 63 
Lumbricillus viridis, n. sp. . : : : : 46 | Explanation of Plates . : 5 9 : : 63 
Enchytreeus nodosus, n. sp. . : ( : 50 
INTRODUCTION. 
The following paper contains an account of certain of the littoral Oligocheeta of the 
Firth of Clyde, found at and near Millport on the Island of Cumbrae, and at Wemyss 
Bay on the mainland. The investigation was begun during a two months’ stay at 
Millport, from May to July, 1909, at which time I was working in the Marine Biological 
Station there, and it was completed after my return to India. I have to thank 
Mr R. Exmurtrst, the Superintendent of the Station, for his constant kindness, and for 
the courtesy with which he placed all the appliances and resources of the Station at 
my disposal. 
In 1906, according to SouTHERN (12), of the more than one hundred species of Enchy- 
treeids then known, only twelve had been recorded from Great Britain, and only seven 
from Ireland. The number of known species of Enchytreids, as well as of other 
limicolous Oligocheta, has been considerably increased since then, and, mainly owing 
to SOUTHERN (12, 13, 14), this portion of the fauna of the British Isles has also become 
better known ; but, as that author remarks, “the large number of new species and of 
additions to the British list shows how much work remains to be done on this order 
before our knowledge can be considered in any way complete.” 
The ten species of which an account follows are, with the exception of one Tubificid 
(Tubifex costatus, Clap.), all Enchytreids. I need not say that the list is very far 
indeed from exhausting the littoral Oligocheete fauna of the Clyde; it contains, indeed, 
only those forms to which I have devoted a fair amount of attention. The several 
species are, I think, interesting in various ways—some (Lumbricillus tuba, L. viridis, 
Enchytreus nodosus, EH. dubius) because they are new; others (Tubifex costatus, 
Marionna semifusca, Lumbricillus subterraneus, Enchytreus sabulosus) because, 
TRANS, ROY. SOC, EDIN., VOL. XLVIII PART I, (NO. 2), 6 
