96 Natural History Notes on Tenby. [Se is 
this, to return, pass round the western extremity of the rock 
and go into the cave again by its northern entrance. T ris 
is by far the richest of the three caverns. Here many species 
of zoophytes occur. Sponges, such as Grantia compressa, ef 
ciliata, G. botryoides, Halichondria panicea, and other species 
abound; whilst of the Polyzoa, Bowerbankia imbricata, Cellt 1D 
laria dratlares Alcyonidium hirsutum, and other species, occur 
in great abundance. The hydroid zoophytes are not so cor 
spicuous as in the other caverns, but careful search reveals ¢ 
greater number of species. Adhering to the rocks like patches 
of coagulated jelly are numbers of compound ascidians,— 
Botryllus and other members of the family Botryllide; whils 
the strawberry ascidian (Amarouciwm proliferum) is found im 
ereat abundance. The Mermaid’s fingers (Alcyoniwm digits 
ent also occurs here somewhat ploniatalied especially in 
the darker portion of the cavern, light appearing to be det ¥ 
mental to the growth of this animal. 
But the interest of this little rock is not confined to the 
interior of the caverns. All round, but especially on tht 
northern side, where in many parts the overhanging rod 
forms shaded recesses, it offers rich spoils to the naturalist 
Many parts are riddled by the mee boring molluse, Saxicay; 
rugosa, known locally as “ red- nose”; and a few specimens i 
Pholas may at times be found. Nudibranchs (£olis and othe 
genera), Brittle-stars (Ophiocoma, &c.), and the common star 
fish (Uraster rubens), are frequent, the last often in enormous 
quantities. Of the larger alge, Laminaria, Enteromorpha 
Porphyra, Delesseria, Rhodomenia, Ulva, and the beautiful 
Bryopsis plumosa, may be cited ; whilst a closer search on the 
rock and amongst the fronds of the larger alge reveals many 
smaller and rarer species. 
Nor are the attractions of Tenby, from a naturalist point ol 
view, limited to St Catherine’s rock. Tenby Head, Monkstone 
Point, and Lydstep are equally productive. St Margaret’ 
Island, some three miles out from Tenby, has caverns more 
magnificent than St Catherine’s or Lydstep, though less rich 
in animal life. The Woolhouse Rocks, at high-water sub- 
merged to the extent of fifteen or twenty feet, and accessibl 
only at low tide by boat, also afford a rich field of study: 
Here the pretty little cat-limpet (Patella pellucida) is found ir 
