FROM THE EDPYSTOXE GROUNDS TO START POINT. 477 



bility for the statement that a species occurs upon a particular ground 

 is in all cases my own. Owing to the fact that I was only acquainted 

 with a few of the more common forms at the time when the dredgings 

 were in progress, the information as to the relative abundance of each 

 on the different grounds is less definite and reliable than that given for 

 other groups. Several species are represented by one or two specimens 

 only, but it is probable that if the material had been examined on 

 board the boat at the time it was dredged by someone with a knowledge 

 of them, other specimens would have been found. In all such cases it 

 may, however, be taken for granted that the worm was nowhere 

 abundant. 



For geographical distribution I have relied largely on the lists given 

 by Saint-Joseph (Nos. 102 and 103) and by Michaelsen (No. 79). 



Polygordius sp. (Chart X.). An undetermined species of Polijgordius 

 was abundant on the clean shell gravel of the Bolt Head Ground 

 (XVII.), where it formed a characteristic feature of the fauna. The 

 same species was also found in much smaller numbers on the clean 

 shell gravel immediately to the west of the Eddystone reef (XVI.). 



Euphrosyne foliosa. Obtained once only on the fine gravel of Ground 

 XIV., west of the Eddystone, in haul 85. 



Distribution. Geographical. A soutliern species. Mediterranean, west of France, 

 English Channel (Saint- Josepli, No. 102), Channel Islands to Shetland, especially on 

 west of Great Britain and Ireland (M'Intosli, Xo. 84). Apparently not in the North Sea, 

 where the northern species, E. borealis, Oerst., takes its place. 



Depth. To 344 fathoms (Pola expedition, Jide Saint-Joseph). 



Aphrodite aculeata (Chart X.). This species was most abundant on 

 the fine sand of Ground \., to the north of the Eddystone, where seven 

 specimens were obtained in one haul of the otter-trawl. One or two 

 specimens were taken on the neighbouring fine sand grounds III. and 

 IV., but the species was never found elsewhere. 



Habits. Aphrodite buries itself in the sand, but probably not to any 

 considerable depth. In confinement it is seen travelling rapidly at the 

 surface of the sand, leaving deep furrows behind it. 



Distribution. Georjraphical. Iceland, United States (Vcrrill), Faroe, Norway, Britisli 

 Coasts, Mediterranean, Red Sea {fide Michaelsen, No. 79, and Saint-Joseph, No. 102). 



Depth. Shore (Saint-Joseph) to 530 fathoms {Knight Errant), 257 fathoms and 690 

 fathoms {Porcupine, M'Intosh, No. 82). 



Bottoiii-deiJosit. All the authors record the species from sandy or muddy ground, never 

 from giavel or coarse ground (Mobius, No. 87 ; Hansen, No. 36 ; Michaelsen, No. 79 ; 

 Haddon, No. 34 ; Hornell, No. 49). 



Hermione hystrix. Single specimens were obtained on the coarse 

 gravel of Grounds IX. and X., in hauls 93 and 42 only. The species in 

 the Plymouth district is generally met with on coarse grounds, and has 

 never been found to be abundant. 



NEW SKRIKS. — VOL. V. NO. 4. ^ 



