CAVES AND CAVE DEPOSITS. 179 
The old excavation at the upper mouth of the Cae Gwyn Cave 
was reopened, and a clear section cut through the ‘‘ Head”’ 
into the undisturbed drift, in which last, at a distance of some 
& feet from the rock above the cave and about 7 feet below the 
surface of the ground, in a bed of sandy clay (see fig. x2); 
17 species of shells were found, of which the list is recorded in 
column I. of the following Table. A full list of the shells 
found in the drift of St. Asaph and Colwyn is given in column 
II., and in columns III., IV., and V. I have shown which of 
these occur at Rhyl, or on any part of the British coast, or in 
the Bridlington Drift. 
Ba Tareath o 
2. 3 ~~ =k qa a 
O Ms2) 5 | 23/156 
2 |:%'6| 4 | 6 Zs 
oS hm P| & | mo ]m 
e I. II Ill IV Vv 
Ostrea edulis, L272. ......ceeeeeeeee| ¥ * * * 
Mytilus edulis, Ziznm, ...... se secu * * * * * 
—(Modiola) modiolus, Zimm. ......| +» * * * * 
Nucula nucleus, £2772. ......cseecee * * * * 
Pectunculus glycymeris, Zimz........ * * ve * * 
Cardium echinatum, Zz. ..........| * * * * 
ee edule (2nd sh asec vceccs'ss| . * * * * * 
Cyprina islandica, Ziv ......s000--|  * * * * * 
Astarte borealis, Chemt7....csesee00+| * * A - * 
ee CIMcAta WL COME | veojencesecs| © * af * * 
— sulcata, var. elliptica .......... * ate * * 
Artemis exoleta, Z2772....... seeees es * * * 
Hinctay Plt, vu de side cles mele sat i . * 
Venus gallina, Ziv7......... eta asnoien tall tas ? * * 
BEES ED. conn artnes tecsacecncssiasl .& P * * 
Tellina balthica = solidula .......... * * * * * 
Psammobia ferréensis, Chemn. ......|  * * * * 
Donax anatinus, Lamk. .......- ernie) Hee: Poi} * * 
Mactra solida, Li77........seeseeees Pape Liars * 
—— solida, var. elliptica = ovalis .... + * * * 
Corbula gibba, Olivz.,.... 022. eeeees pe * * * * 
Mya truncata, L277 ....seseseee see: * * * * * 
Dentalium, sp. ........+- Safa, Wate fore leat * 1¢ s * 
Fissurella graeca, £27072 .. ....eeeesees # * Ss v5 
Littorina littorea, £2772. ....seeeeeee| oe * * * * 
Bl obtusatay Lite sete sal oe 0! be * AE, * * 
Turritella terebra, £27272. ....eeee-ees| ¥ * * * * 
Purpura lapillus, Z27272....esesseereee| oe * * id * 
Buccinum undatum, L277. ..seeceees| * * * * * 
Murex erinaceus, Zim7..... Deaisiineas ais) a * % * 
Trophon clathratus, Lim. .......++- * and oe * 
—— truncatus, StvOm. .recseseeees * we * * 
Fusus antiquus, L277. ...eseeeeeeess * * * 
Nassa reticulata, Z2772.......0000++5- * * * 
Pleurotoma rufa, AZont. .......00eee * ai * 
turricula, Mont. .. .cscceeesess + * * * 
Balanus, Sp. ..+- sss eeeeeeee * * | * ~ 
MONON) said cringix's ng Safe pis Saisie «bisa lapis 7 * ead ie * 
CVEYSEE TS BS TRS eT eT eee Bt ti) 2) eS 
