PLATE CI. 



Fig. 



1. Head and anterior region of Girratulispio Gaulleryi, Mcintosh. Enlarged. 



2. Head and anterior region and portion of succeeding region of Magelo?ia papillicornis, 



F. Midler. Enlarged. 

 2 a. Dorsal lamella of an anterior foot viewed from above. Magnified. 

 2 b. Ventral lamella from the same region viewed from above. Magnified. 



2 c. Lamellge of the foot of the fifth segment of the posterior region : c, tuft of bristles ; 



s, dorsal and ventral hooks ; fi, muscles of the foregoing ; hp, hypoderm. 

 Magnified. 



3. Head and anterior region of Pceciloclisetus serpens, Allen. (After Dr. Allen.) Enlarged. 



3 a. Posterior region with caudal termination of the same. (After Dr. Allen.) Enlarged. 



4. Head and anterior region of JJasybranchus caducus, Grube (in spirit). Enlarged. 



4 a. Segment of the middle region with branchise. Enlarged. 



5. Head of Praxillella gracilis, Sars, with proboscis extruded. Enlarged. 



5 a. Caudal funnel of the foregoing. Enlarged. 



6. Cephalic region of Asychis Jeffreysii, McL, off Cape Finisterre 'Porcupine,' 1870. 



Enlarged. 



6 a. Cephalic plate of the foregoing from the dorsum. Enlarged. 



7. Cephalic region in a small specimen of Asychis biceps, Sars. Enlarged. 



7 a. Caudal extremity of the foregoing. Enlarged. 



8. Tube of Owenia fusiformis, Delle Chiaje, from a living example between tide-marks 



at Lochmaddy. Slightly enlarged. 



8 a. Branchiae of an example of the same in a state of contraction. Enlarged. 



8b, 8c, and 8d. Three views showing various changes in the lip-organ of this species. 



Enlarged. 

 8 e. Sketch showing how a specimen protected itself in a fragment of a tube a third of 



its length. Photo by Mr. Arnold Watson. 

 8f. Spindle-shaped contracted tube with annelid internally. From a photograph by 



Mr. Arnold Watson. 



9. Anal funnel of Pseucloclijmene OEJrstedi, Claparede. Enlarged. 



10. Caudal hook of Polydora hopleura. X oc. 4, obj. A w, 3 in. draw-tube. 



