ANNELIDS. I. 



2] 



In the small specimens the setae are comparatively somewhat longer than in the large, and the 

 form of the animal on the whole short and broad, the result will be that the small specimens, 

 seta; included, are about equal in lenght and width. The largest specimen, the length of which is 

 16 mui., has a width of 6 mm. When the setae are included, it measures 1 i mm., consequently consider- 

 ably more than half the length of the animal. 



The colour varies as regards my material according to the size of the animal. While the colour 

 of the largest must be described as very dark-violet, almost black-violet, and very iridescent, the young 

 specimens are all slightly pigmented and of the well known milk-white colour, which is always assumed 

 by transparent, pelagic animals when thev are thrown down into spirit. ( >nly the pharynx is with the 

 young specimens of a dark colour, while the living animal is likely to have been almost colourless and 

 transparent. This ease grew 

 extremely interesting in 

 that another pelagic Poly- 

 noid, a Drieschia was found 

 in my material among the 

 species here dealt with, also 

 a small, transparent form, 

 but the proboscis of which 

 was strongly pigmented with 

 the same dark-violet colour 

 which was found in the 

 same organ of //. Hubrechti. 

 In this connection it must 

 be allowed to call to mind 

 the black and very dark 

 coloured deep-sea fishes which are specially dealt with in Murray and Hjort's work "the Depths of 

 the ocean" and which the authors indicate as living in similar depths as the animal under consideration. 



The cephalic lobe is relatively small, somewhat broader than long; the lateral margins are 

 convex, the incision in the middle is broadest in front and tapers graduallv towards the base. The 

 frontal prominences are inconspicuous and more dorsally situated than usual in Polynoids. The eyes 

 are large and strongly pigmented ; the two eyes on the same side are situated close together. The 

 palps are rather thick and clumsy and provided with a short terminal filament. The unpaired antenna 

 is long with a conspicuous basal joint. The paired antennae are short, about one third of the length 

 of the unpaired. The tentacular cirri are long and slender. All these appendages are smooth and 

 devoid of papillae. (PI. II, fig. 2). 



The scales (PI. II, fig. 3), which are circular or ovoid, have their entire surface beset with small 

 conical spiny prominences, the dimension of which increases from the inner to the outer edge of the 

 scales. No papilhe are found along the edge. 



The foot is well developed in length as well as in height. The length of the dorsal cirrus 

 is conspicuous fig. 7. The dorsal setae, which are arranged in rosette-like groups and pointing towards all 



fig- 



