118 
NOTES ON TWO BARE ANNELIDS. 
signification. Budding-zones in the abdominal region 
between every two segments. The whole nerve system in 
the epidermis. 
“ C. pardalis: Clap. Intestine, dark brown ; in the skin 
numerous green drops. Amongst algae and diatoms.” 
NAIS HAM AT A. 
This annelid, which is new to Great Britain, I found 
lately amongst a quantity of desmids and diatoms in a 
shallow ditch in Sutton Park, and I have more recently 
found associated with it Nais lurida. Both these were first 
discovered in Lower Franconia by B. Timm, and were 
figured and described by him in the Arbeiten Zool. Zoot. 
Inst, in Wurzburg, 1883. He describes the Nais harnata 
as follows:— 
“ The number of segments varies in a single individual 
between 20 and 30; body colourless, pellucid. Ventral 
bristles fine, generally two or three together. Dorsal bristles, 
begin in the fourth segment, reaching nearly three times as 
long as the thickness of the body, arched like a scimitar, 
furnished on the convex side with fine barbs, which are at 
least as long as the bristle is thick. In every bundle there 
are four to seven long and one to three shorter bristles. 
Tactile bristles (especially on the head), somewhat abundant. 
Brain not so distinctly divided into two lobes as in the other 
Naidina. Alimentary canal proportionately very large, with 
unusually strong, not interrupted, cell-layer. Muscular 
system extremely minute; whether a ring muscular layer is 
present, I cannot say ; for the rest, it resembles that of the 
other Naidina. Both the blood-vessels have a considerable 
volume ; their transverse section is mostly greater than that of 
the alimentary canal.- I have only been able to see vessel- 
loops in the head segments, but it must not be understood 
that they are wanting in the remaining segments. 
Intestinal net distinct. The eyes, whose occurrence generally 
in the Naidina is very variable, are not always present. 
The extraordinarily thin epidermis thickens itself in the 
head and tail considerably, so that at both ends it forms a 
kind of cap. Length of each single animal, three to five mm. 
“I have only found a few examples of this species in the 
act of budding, and then the zooids always holding together 
only in twos. Of these, the second was universally richer in 
segments than the first, while in the two-jointed chains of 
Nais elinguis I generally found the reverse condition.” 
