196 ■* SYLLID,«. 



pair are usually coalescent, and form a rather undefined reddish spot. 

 *' Posterior to the eyes, on the dorsal surface of the head, are placed 

 two blunt processes of equal thickness throughout, which recline 

 over the back, and are easily unobserved. The proboscis is short 

 and barrel-shaped, without teeth ; but there were two slender linear 

 bodies, which appeared ligamentous in structure, implanted in the 

 sides."— 2^. D. Dyster. 



{a) Cullercoats, A. Hancock and Jos. Alder. 



Plate XVI. Fig. 1. Animal magnified. 2. Natural length. 3. Head, 

 above. 4. Head, side of. 5. Mouth. 6. Foot, with cirrus and 

 bundle of bristles. 7- Bristle magnified. 



21. MYEIANIDA. 



Myrianide, M.-Edw. in Ann. des So. nat. (1845) iii. 170 & ISO. 

 Myrianida, Grube, Fam. Annel. 62. 



Char. Head rounded in front without lobes : antennae three, placed 

 near the posterior line, somewhat clavate ; tentacular cirri two pairs, 

 similar to the antennse : segments transverse, numerous : feet vdth a 

 clavate dorsal cirrus, jointed at its insertion ; the setigerous branch 

 with a brush of compound falcate bristles : no ventral cirrus. 



1 . M. pinnigera, the segments white, transversely marked with 

 yellow. Length l^". 



Nereis pinnigera, Montagu in Linn. Trans, ix. 111. tab. 6. f. 3. Penn. 

 Brit. Zool. edit. 1812, iv. 95. 



Hab. S. Coast of Devonshire, Montagu. 



Desc. " Body long and slender, with numerous opake white joints 

 transversely marked with yellow, and furnished at the sides with long 

 flat appendages that flow over the back : tentacula scarcely distin- 

 guishable, unless the longer appendages in front be such : eyes four, 

 chocolate colour. The posterior end suddenly decreases, and be- 

 comes very small, as if that part had been newly formed ; a circum- 

 stance of no unreasonable conjecture, as it is well known that many 

 of the MoUusca tribe are capable of reproduction." — Montagu. 



22. lOIDA*. 



loida, Johnston in Ann. Nat. Hist. iv. 231. Oersted, Grosnl. Annul. 

 Dorsibr. 30. 



Char. Body scolopendriform, with many segments : head small ; 

 eyes two, large ; antennse three, filiform, submoniliform : tentacular 



* From 'loeihjs, blue or violet-coloured. The name is given by Drayton to 

 one of his Naiades : — 



" loida, which preserves the azure violets." — Polyolbinn, Song xx. 



