638 E. J. ALLEN. 



of the Yealm Estuary, near the mouth. In fine clean sand at Wem- 

 bury Bay. 



Prof. Mcintosh considers that these are young N. latericeus. The 

 appearance of the living worms is, however, quite distinct, and both 

 the habits and the habitat of the two forms are different. N. latericeus 

 burrows by constantly protruding the proboscis and when examined 

 alive it is continually performing this movement. In the case of 

 N. rubicundus, although many specimens have been watched, I have 

 never yet seen the proboscis protruded. 



Capitella capitata (Fabricius) : Mcintosh, Mon. Brit. Ann. Ill, 1, 

 1915, p. 280. 



Plymouth. Common in black mud from between tide-marks, 

 Wembury Bay and Eum Bay. 



Heteeomastus filiformis Claparede : Eisig, Die CapitelHden des 

 Golfes von Neapel, 1887, p. 839. 



ExMOUTH. A few specimens in the sand west of Salthouse 

 Lake (Journ. M.B.A., voL 6, 1902, p. 320). 



OPHELIID^. 



Ophelia bicornis Savigny : de St. Joseph, Ann. Sci. Nat. Zool. V. 1898, 

 p. 380. 



ExMOUTH. Very a,bundant in clean sand on the Pole Sands. 

 Occasionally met with on other sand-banks (Joum. M.B.A., vol. 6, 1902, 

 p. 321). 



A considerable number of specimens have recently been examined 

 and they have been compared with typical specimens of 0. limacina 

 Kathke from the North Sea. The distinguishing characters de- 

 scribed by de St. Joseph are remarkably constant and there is no 

 doubt that the two species are quite distinct. The list of synonyms 

 of 0. limacina given by Mcintosh (Mon. III. l, 1915, p. 10) therefore 

 requires revision in the sense indicated by de St. Joseph. In the 

 first region of the body of 0. bicornis there are 9 setigerous segments, 

 then follow 15 setigerous segments bearing gills or dorsal processes, 

 and behind these five setigerous segments without gills, and one 

 achetous anal segment. A constant character of the species not 

 mentioned by de St. Joseph is a lateral, vertical, glandular fold of 

 skin, which lies immediately in front of the 9th parapodium. The 

 lips of the parapodia are much less strongly developed than in 



0. limacina and all the bristles are much shorter, more slender and 

 inconspicuous. The lateral rov/s of pores immediately above the gills 

 described by de St. Joseph in Ophelia neglecta Schneider, which 

 are very conspicuous in the large specimens of 0. limacina (cf. de St. 

 Joseph, p. 379) are entirely absent in 0. bicornis. 



Ammotrypane aulogaster Rathke : Mcintosh, Mon. Brit. Ann, III. 



1, 1915, p. 15. 



