Fam. 1, Plate 22. 



POLYCERA QUADRILINEATA, Muller, Sp. 



P, alba, seriebus 4 — 9 longitudinalibus tuberculorum flavorum notata; velo cuspidibus 4, elongatis, 

 flaro terminatis; branchiis 7 — 9, pinnatis, lobis branchialibus, utrinque 1, linearibus. 



Doris quadrilineata, Mull., Zool. Dan., v. 1, p. 18, pi. 17, f. 4 — 6, and v. 4, p. 23, pi. 138, f. 5, 6. 

 Gmel., Syst. Nat., v. 1, p. 3104. 

 cornuta, Abildg., Zool. Dan., v. 4, p. 29, pi. 145. 

 flava, Mont., in Linn. Trans., v. 7, p. 79, pi. 7, f. 6. 

 Polycera lineata, Bisso, Hist. Nat. de FEur. Merid., v. 4, p. 30, pi. 1, f. 5. 

 flava, Flem. Brit. Anim., p. 283. 



ornata, D'Orb. in Guer. Mag. de Zool., v. 7, p. 9, pi. 107. 

 typica, Thomp., in Ann. Nat. Hist., v. 5, p. 92, pi. 2, f. 5. 

 quadrilineata, Idem., pi. 2, f. 6. 



Alder, in Ann. Nat. Hist., v. 6, p. 338, pi. 9, f. 1—6. 

 Verany, Cat. Anim. Inv. Gen., p. 16. 

 cornuta, Loven, Ind. Moll. Scand., 6. 

 Hab. Among small sea-weeds in pools between tide-marks, and in shallow water. Coasts of 

 Devonshire and Cornwall, frequent. Scarborough, plentiful, /. A. Strangford Lough, W. Thompson, 

 Esq. Boundstone Bay, Galway, Professor E. Forbes. Dublin Bay and Malahide, /. A. Whitley and 

 Cullercoats, Northumberland ; Marsden, Durham, /. A. and A. H. Near Cumbray Island, Frith of 

 Clyde, Rev. D. Landsborough. Isle of Man, J". A. 



Body from half to three quarters of an inch in length, nearly linear, slightly compressed, 

 swelling a little in the middle, and tapering to a point behind ; smooth, transparent, and 

 usually white, but sometimes spotted or lineated with black, and always with rows of yellow 

 tubercles. Tentacles linear or subclavate, broad at the base, and a little bent backwards 

 above, with the mucro much produced ; the upper half is yellow, with about nine or ten 

 laminae, nearly meeting in front ; the lower part is smooth, and usually white, but, in some of 

 the varieties, black. Frontal veil rather expanded, and adorned with four elongated and 

 pointed filaments of a golden yellow or orange colour. Head inferior, with a small lobe on 

 each side. From the margin of the veil a row of yellow or orange tubercles runs on an 

 elevated ridge along each side of the back to the branchial lobes ; another row occupies the 

 centre of the back, and there is also a similar row on each of the sides : these five rows have, 

 in finely developed specimens, less perfect intermediate rows, increasing the number to nine. 

 The tubercles are sometimes confluent, forming continuous yellow stripes, and in the variety 

 first figured by Muller, the tubercles, in four of the principal rows, are united by black lines ; 

 hence the name of quadrilineata. A few tubercles, ending in a yellow line, occupy the ridge 



