1. Hydrobia ulvae. Arrow indicates single pallial tentacle. Shell 4.2mm high, translucent spire, deep sutures, patterned head. Small pool 33p.p.t. on sand at mouth of Dee Estuary. 58 others examined had un-patterned heads & deep sutures.
2. Hydrobia ulvae. Arrow indicates single pallial tentacle. Shell 4.2mm high, translucent spire, deep sutures, patterned head. Small pool 33p.p.t. on sand at mouth of Dee Estuary. 58 others examined had un-patterned heads & deep sutures.

Hydrobia ulvae. Arrow indicates single pallial tentacle. Shell 4.2mm high, translucent spire, deep sutures, patterned head. Small pool 33p.p.t. on sand at mouth of Dee Estuary. 58 others examined had un-patterned heads & deep sutures.

Hydrobia ulvae

© I.F. Smith

Hydrobia ulvae

© I.F. Smith