pagto 
XIII. On some New British Polynoïna. By E. RAY LANKESTER, Esq. 
Communicated by J. G. JEFFREYS, Esq., F.L.S. 
(Plate LI.) 
Read January 18th, 1866. 
THE species described in the following pages were collected by me while in Guernsey, 
last summer, with my friend Mr. Gwyn Jeffreys, dredging under the grant of the British 
Association. I have had very great difficulty in studying the Annelida obtained thence, 
as every systematic work on these animals with which I am acquainted, in either 
French or English, is most unsatisfactory and imperfect. Prof. Malmgren’s work on 
the North-Sea Annelida, now in course of publication, has given me much valuable as- 
sistance, as also Prof. Kinberg’s work in the ‘ Voyage of the Eugenie.’ Both of these 
are written in the Swedish language; but the descriptions and much valuable matter 
are given in Latin. I have endeavoured, as far as possible, to take Prof. Malmgren’s 
descriptions of species as my model, and have, I hope, succeeded in making my de- 
scriptions uniform with his. I have, however, introduced one or two alterations in the 
nomenclature, mainly as suggested by Prof. Huxley in his Lectures on General Natural 
History. Thus all the somites in front of the mouth are called the “ prostomium,” and 
the tentaculwm is called the prostomial tentacle. The somite round the mouth is called 
the peristomium, and its appendages, usually known as tentacular cirri, are called peri- 
stomial cirri. Each foot is called a parapodium, and divided into a notopodium and a 
neuropodium, corresponding to the “rame dorsale" and * rame ventrale” of Audouin 
and Milne-Edwards. The segment beyond the anus is denominated * pygidiwm." All 
the somites provided with feet are called truncal somites, and form the trunk (seg- 
Menta pedibus instructa), while the prostomium and peristomium form the “ head ” (pars 
cephalica). The number of somites constituting the prostomium is a. subject still re- 
quiring investigation, but does not come within the scope of the present paper. The 
remarkable and very varying histiological characters of the “elytra "dn the Polynoina 
are also exceedingly interesting, and might be made to furnish generic characters as 
readily as the form of the sete. Nearly all the Annelida now to be described were 
obtained under rocks and stones at low-water mark. 
Hanuorno& (Kinberg). 
Body oblong. Antenn: attached under the base of the prostomial tentacle, which oc- 
Cupies a frontal incision of the cephalic lobe. Palps broad, subulate ; to the naked eye 
Quite smooth, but found with the microscope to be densely covered with minute papillæ. 
Elytra fifteen or twenty pairs, usually covering the whole back, placed on 1, 3, 4, 6, 8 
VOL. XXV. 36 
