376 MR. E. R. LANKESTER ON NEW BRITISH POLYNOINA. 
laterales. Antenne minute, deciduæ, tamquam à prominentiis lobi cephalici 
orientes sitæ. Tentaculum prostomiale inter prominentias frontales magno articulo 
basali insertum, dense ciliatum, apice aucto, lobo cephalico plus quam ter longius. 
Cirri peristomiales formå et magnitudine tentaculi. Elytra dura, tuberculis nodu- 
lisque duris armata, primo pari suborbiculari excepto reniformia, margine tuber- 
culis acutis valde dentato postice et externe parce ciliato. Cirrus notopodialis pyri- 
formis, sacculatus, eiliatus, brevis. Cirrus neuropodialis subulatus, breviter ciliatus. 
Papilla ventralis conspicua. 
Color.— Elytra brunnea, pellucida, pulcherrime maculata. Truncus passim aurantiaco- 
ruber. Set: fulvæ. | 
Longit. 35-44 centimetres. 
Latit. 1-1:2 centimetres. 
Hab. haud vulgatissime ad oras occidentales insulæ Hermi, fundo lapidoso. 
Tab. LI. fig. 1. Antinoé nobilis ; fig. 2. Pars cephalica, aucta, dorsum ; fig. 4. Pars cephalica, aucta, ventrum ; 
fig. 3. Parapodium ; fig. 5. Elytron, valde auctum; fig. 6. Pars elytri; fig. 7. Cirrus notopodialis; 
fig. 8. Seta notopodialis; fig. 9. Seta neuropodialis. 
This very handsome species I obtained only at Herm, and there by no means com- 
monly. It was invariably found close to and in the tubes of Terebella nebulosa, on 
which Annelid it apparently feeds. ‘Che bright salmon-red colour of both is remarkable. 
Nearly every species of Polynoina appears to have its special victim; and T. nebulosa 
undoubtedly serves this form. 
The remarkable form of the notopodial cirri in this species is well worthy of attention; 
they are invariably as it were inflated, so as to have an almost globular appearance, 
instead of being filiform as is usual. The only other, similar instance I have noticed is 
in a species described by Schmarda as Gastrolepidia clavigera. 
The colour of the optic lobes is violet, whilst the palps, which are long and exces 
sively sensitive, are deep madder-brown; the orange-red colour of the body, which is 
seen through the tough but translucent elytra, renders this a very fine-looking species, 
The peculiar dentation of the edges of the elytra and their other markings (see plate) are 
| produced by the extraordinary development of the marginal cells, which are usually simply 
disposed in the tissue of the scale. The growth of these cells is such that they press 
one against another, and thus become hexagonal and elongated where the lateral pres- 
sure is greatest. 
I have had some doubts as to whether this form rightly belongs to Kinberg's genus 
Antinoë, but I am unwilling to multiply names at present by instituting à fresh genus 
for its reception. 
In the British Museum there is a large specimen of this species without its elytra oF 
cirri, labelled Lepidonotus semisculptus, Leach. On turning to the catalogue lately 
published, I find the description of a very different worm and a reference to a drawing ° 
a Lepidonotus with twenty pairs of scales, which is rather puzzling. Hence I conclude 
id e species is certainly not the ZL. semisculptus of Leach, whose original type has 
een lost. 
