374 MR. E. R. LANKESTER ON NEW BRITISH POLYNOINA. 
ous 22, 25, 28, 31, or 32, 85, 38, 41 truncal somites*. Setze of notopodium slightly 
attenuated towards the apex, with minute spicules disposed in dense transverse series. 
Setæ of the neuropodium thinner and longer, and transversely spinate from the bidentate 
apex. "Two pygidial (anal) cirri beneath the anus. 
HARMOTROË SARNIENSIS, n. sp. 
Corpus elongatum, postice attenuatum ; somitibus truncalibus 47. Lobus cephalieus 
latior quam longior, margine antico late inciso, in prominentias duas angulares a 
latere producto ; oculi 4, duo anteriores in lateribus prominentiarum, sub apice earum 
siti. Antenn: longitudine lobi cephalici. Tentaculum antennis triplo longius, arti- 
culo basali conspieuo. Cirri peristomiales magnitudine et formá tentaculi; omnes 
. filiformes, oculo nudo glabro, apice magnitudine aucto. Elytra paria 20, non 
semper totum dorsum tegentia, primo pari suborbiculari excepto, ovali-reniformia 
vel oblique ovata, oculo nudo glabro, margine externo sæpe, in junioribus sem- 
per, breviter et paullo ciliato. Cirrus notopodialis trunci latitudinem longitudine 
æquans, eädem formå et colore ac cirri peristomiales. Cirrus neuropodialis bre- 
vior, subulatus. Papilla ventralis distincta, cylindrico-conica, insertionem cirri 
neuropodialis fere attingens. Cirri pygidiales duo sub ano, cirris notopodialibus 
simillimi sed longiores. 
Color.—Elytrorum variat, in plerisque brunneus variegatus, ssepe griseus, et sepissime 
deest. Sete fulva. Truncus lineis fuscis inter somites notatus. 
Longit. 4-5 centimetres. 
Latit. 8-9 millimetres (cum setis). 
Hab. vulgatissime ad oras orientales insulæ Sarniæ (Guernsey), et ad oras occidentales insulæ Hermi. 
Tab. LI. fig. 14. Harmothoë Sarniensis ; fig. 10. Pars cephalica, aucta ; figs. 15, 16. Elytra ; fig. 24. Valde 
aucta elytri pars. 
The species above described is very abundant under stones near the low-water mark 
at Guernsey and Herm. It is remarkably active, and has the habit, so common and 
fatal among this beautiful group of Annelids, of breaking up into bits when touched. 
Its chief peculiarity is the presence of twenty pairs of scales—a larger number than has, 
I believe, been met with in any of the allied gibbous Polynoina. In many respects it is 
closely related to the Lepidonotus cirratus of J ohnston (Harmothoé imbricata, Malm- 
gren), to which in colour it is very similar, whilst the head does not differ much in 
form, and the setæ are identical. The presence of twenty pairs of scales, however, and 
the consequent presence of forty-seven truncal somites, seems to draw a very marked 
line between the two species ; whilst, moreover, in H. Sarniensis the scales frequently 2 
leave a portion of the body of the animal exposed between them in the middle line, and | 
are very delicate and small. In Guernsey and Herm not a single specimen referable t0 — 
1 
H. imbricata ( Lepidonotus cirratus) occurred. Its place seems to be entirely supplied 
by this species. The special food of H. Sarniensis is, I believe, small mollusca 
Nemertians, 
‘ In Prof. Malmgren’s and other works, the somites are spoken of as “ segments,” and are separated as “ segment 
provided with feet" and “segments destitute of feet.” 
N 
