FROM THE MERGUI ARCHIPELAGO . 



261 



The distribution of pigment on the body agrees very closely 

 with Baird's, and particularly with Horst's, description. On the 

 other hand, Baird's description of the branchiae as being " small, 

 simply branched, and ... of a dark colour," hardly confirms what 

 has been said above respecting the exact resemblance between 

 the branchiae of my species and of C.flava. 



The character of the dorsal setae as described by Horst is the 

 chief obstacle to my definitely regarding the Mergui specimens as 

 belonging to the species C. parva. In the first place, I could 

 observe no such difference between the shaft and the tip of the seta 

 as he describes. It is true that the shaft has usually a somewhat 

 fibrous appearance, while the tip is more transparent ; but I 

 could observe no abrupt line of demarcation. In the second place, 

 the presence of a small spur does not coincide, in the anterior 

 bristles, with the want of serration. 



Etjrythoe alcto^ia, Savigny. 



Pleione alcyonia, Savigny, Systeme des Annelides, p. 62. 



This species has been carefully described in Horst's memoir 

 already quoted. I have examined a large number of specimens, 

 which agree closely with Horst's description except as regards 

 the colour of the setae. 



I find in my specimens the great variety in the characters of 

 the setae of the dorsal and ventral parapodia as described by 

 Horst. The second kind of setae described by him, those with 

 a " slightly bifid tip, one of the divisions being a mere spur, while 

 the other is extremely elongated and tapering," are of a horny- 

 yellow colour throughout the whole of the distal region. The 

 other setae have a colourless extremity. Horst's description 

 states the exact converse. If this is not an accidental error in 

 his description, the variation in the colour is curious and worth 

 noticing. 



I did not observe any " hastate " setae in the notopodium ; but 

 they are present in the neuropodium in my specimens : I could 

 not find more than one in each segment, and they were deeply 

 imbedded in the soft tissue, the spear-like extremity alone pro- 

 truding. These setae are stout. 



Braschiohma intermedium, n. sp. (Plate XXI. figs. 4-7.) 



The collection contained two specimens of this species, one of 

 which only was perfect, and measured about 100 millim. in length, 

 including the branchiae. There were also a number of fragments, 



