PLATE LV1. 



Fig. 



1. Aricia Latreillii, Aud. and Edw., from St. Andrews. Enlarged. 

 1 a. View of tip of tail with vent and cirri. Enlarged. 



2. Goniada Q?iaculata, (Ersted, from the sand, near low water-mark, St. Andrews. 



Enlarged, 

 o. Mid-dorsal segments of the same. Enlarged. 



4. Ophryotrocha puerilis, Clap, and Meczn. Enlarged. 



5. Tip of tail of the foregoing. Enlarged. 



6. Nematonereis from Plymouth, 7th September, 1905, from the dorsum. Enlarged. 



7. Scoloplos armiger, 0. F. Miiller. Dorsum shown anteriorly ; posterior region seen 



laterally. 



