MOLLUSCA. 
87 
varieties are found on the zoophytes in the fishing-boats. 
Occasionally in the stomach of the cod. 
Tritoniaplebeia, Johnston; A. & H. B. Nud. M. fam. 2, 
pi. 3. 
In vast numbers amongst the zoophytes from deep water, 
in the crevices of Alcyonium digitatum and on Halecium 
tossed ashore after storms. One specimen showed the abnorm¬ 
ality of a bifid tail (Plate II. fig. 15). 
Suborder III. ACANTHOBRANCHIATA. 
Fam. 1. Polyceridse. 
Genus 1. iEGiRUS, Lov6n. 
AEgirus punctilucens, D’Orbigny; A. & H. B. Nud. M. 
fam. 1, pi. 21. 
Not uncommon under stones in rock-pools between tide- 
marks at the East Bocks. 
Genus 2. Triopa, Johnston. 
Triopa claviger , Muller ; A. & H. B. Nud. M. fam. 1, 
pi. 20. 
Fine specimens are occasionally found under stones near 
low-water mark. The same Ergasilus is parasitic on this as 
on Doris. 
Genus 5. Polycera, Cuvier. 
Polycera quadrilineata , Muller; A. & H. B. Nud. M. 
fam. 1, pi. 22. 
Not uncommon near low-water mark and in the laminarian 
region. 
Polycera ocellata , Alder & Hancock ; A. & H. B. Nud. M. 
fam. 1, pi. 23. 
Gregarious under stones between tide-marks, but not com¬ 
mon. They chiefly occur at the West Bocks. 
