Gatty Marine Lahoraioru , St. Andrews. 3 



The feebly winged bristles persist in the dorsal division to the 

 posterior end, but no hooks accompany them. In the last 

 twelve or thirteen segments the branchise diminish and dis- 

 appear. The secoiid s|)ecies, N. Iridentata, is smaller (1 inch), 

 with two pairs of eyes arranged nearly in a transverse line 

 on the spindle-shaped head, and a pair of short, thick, deep 

 chocolate tentacles. Tiie first setigerous segment carries 

 only a ventral tnft of capillary bristles, and thns diflers from 

 the foregoing with abranchia on the first foot, as it also does 

 in the presence of Avinged hooks with two spikes above the 

 main fang on the fifteenth segment ventrally. Branchiae 

 commence on the second foot. Mr. Southern observes that 

 this species frequents laminarian roots, whereas N. longi- 

 rostris is found in clean sand. 



Another form, Pohjdura coeca, CErsted, which some have 

 confounded with Pulydora flava, has been procured from 

 diverse localities on English, Scottish, and Irish shores. In 

 general aspect it resembles P.Jlava, but is distinguished by 

 the presence of stout acicular bristles in the dorsal division 

 of the foot from the twenty-fifth segment in front of the anal 

 " sucker" backward. The strong bristles of the fifth segment 

 I'eserable those ot^ P. flava, with a bold hook at the tip and 

 no spur. 



Mr. Southern records Polydora giardi, Mesnil, a form with 

 a spur below the terminal hook of tlie gieat bristles of the 

 fifth segment. The examination of a minute example has 

 not proved the necessity for including it as yet as a separate 

 species. 



Aonidcs paucibranchiala, Southern, a small form from the 

 West Coast ot Ireland, differs from the common Aonides 

 oxrjcephala^ Sars, in having only ten or eleven pairs of 

 branchiae instead of 22-23 pairs. The tail has four cirri, 

 whereas in A. oxycephala the caudal region has dorsaily two 

 short conical lobes, and ventrally eight smaller conical cirri. 

 As the result of Mr. Southern's special attention to the 

 Cirratulidse in the rich region of the West Coast of Ireland, 

 two new species of Chatozune have been found, viz. C. alata 

 and C. killariensis, both very small species ; yet both were 

 found mature. The former has a conical head and a pair of 

 deeply-placed eyes. The tentacles are large, and each is 

 accompanied by a lateral cirrus. Capillary bristles occur in 

 all the dorsal tufts, the shorter forms with flattened tips. 

 Hooks appear ventrally in the twenty-first segment, and 

 capillary bristles are always present in the ventral division. 

 The conical head of ChcBtozone killariensis is devoid of eyes, 

 and the tentacles and their lateral cirri are present in frunt 

 of the first bristled segment. Anus dorsal^ with a ventral 



1* 



