| Author | James, B.L. |
| Year | 1968 |
| Title | The Distribution and Keys to Species in the Family Littorinidae and of their Digenean Parasites in the Region of Dale, Pembrokeshire |
| Series | Field Studies |
| Type | Book/Report |
| How Complete | Keys to adults of the 4 Littorina species, 5 subspecies and numerous varieties, and to their 22 cercarial parasites then known. |
| Source | Field Studies, 46pp, Field Studies Council |
| Illustrations | Line drawings of shells and pigment distribution in the snails, line drawings of Cercariae |
| Review (by Malcolm Storey) | Separately bound reprint from Field Studies Vol 2 No. 5 (1968) pp 615-650. A short booklet covering the species, subspecies and varieties of Littorina (now well out of date), plus 22 cercarial (trematode) parasites. Although the distribution information relates to the Dale area, the dichotomous keys are more widely applicable. |
| Examine |  with x8 or x10 hand lens ( Compound Microscope is also useful) |
| Specimen Preparation | Snails: alive or shells; cercariae - under the microscope. |
