OBSERVATIONS ON THE ENTEROPNEUST, PROTOGLOSSUS KOEHLERI (CAULLERY & MESNIL)
*Marine Biology Station, Menai Bridge, Anglesey.
- 1Protoylossus Koehleri occurs in the inter-tidal region on the Beddmanach shore of Holy Island, and in St. Martin's Bay near the Hague.
- 2The habitat and associated fauna is described.
- 3Distinguishing characters:–colour; shape of proboscis; operculum small; overall size and proportions of the body; gonads prominent and overlapping branchial region; fourteen to forty pairs of branchial pores; radial arrangement of proboscis musculature; proboscis diverticulum simple; proboscis skeleton simple; crura embracing about three quarters of the buccal cavity, and terminating just anterior to the operculum. Collar and trunk cavities distinct, perihaemal and peripharyngeal cavities rudimentary. Oesophageal pores absent. Hepatic gut simple with expanded lumen. Lateral gonads; genital sacs simple, ducts absent. Oocytes pink, averaging 430 μ in diameter.