NOTES ON TWO RARE ANNELIDS. 
117 
NOTES ON TWO BARE ANNELIDS.* 
BY T. BOLTON, F.R.M.S. 
CTENODRILUS PAR DALIS. 
This interesting little annelid turned up for a short time 
in abundance in one of the marine aquaria in my studio. 
It is impossible to say'what its source may have been, as I 
have added organisms to my aquarium from the south¬ 
west, and north-east coasts of England, and also from 
North Wales. 
It was described in 1863, by Edward Claparede, from a 
single immature specimen which he had found two years 
before near St. Vaast la Hougue, on the coast of Normandy, 
nearly opposite the Isle of Wight, and was named by him 
Ctenodrilus partialis, nov. gen. et sp. Professor E. Ray 
Lankester considers that the same animal was described 
in 1857 by Oscar Schmidt under the name of Parthenope 
serrata. Dr. J. Kennel gives a long report on this annelid 
in the Arbeiten Zool. Zoot. Inst, in Wurzburg, 1882, 
as a contribution to the knowledge of the anatomy and 
gemmation of annelids. He had the opportunity, in 1879, 
of examining it very carefully in the Zoological Station of 
Naples, where it appeared in great abundance in the 
diatomacean slime on the surface of the tanks in the 
aquarium. 
He gives the following as the characteristics of the genus 
and species :— 
“ Fam. CtenodrilidcD: Small marine annelids, consisting of 
few segments, bundles of bristles on each side bilateral, 
bristles pectinate at the point, blood-vessel system not closed, 
dorsal vessel is only in the first body-segments, and opens 
into the ventral cavity in the first abdominal-segment. 
A single pair of segmental organs in the head. Continuous 
multiplication by subdivision in combination with budding- 
processes. Sexual reproduction unknown. 
“ Ctenodrilus: 12—15 segments, head consisting of two or 
three segments, mouth with a strong evertible underlip; 
in the dorsal blood-vessel a string-like organ of doubtful 
*Exliibited before tbe Birmingham Natural History Society, oil 
November 18th and December 9th, 1884. 
