a 
ON THE GENUS NOTOPYGOS. 241 
NOTE XVIII. 
ON THE GENUS NOTOPYGOS, 
WITH SOME NEW SPECIES FROM THE 
MALAY-ARCHIPELAGO COLLECTED BY THE 
SIBOGA-EX PEDITION 
BY 
Dr. R. HORST. 
The genus Notopygos was based by Grube in 1855 ') on an 
Amphinomid worm from St. Helena, N. crinitus, especially 
characterized by having the anus situated dorsally at some 
distance from the last segment. Some time afterwards ®) he 
described another species, NV. ornatus, from Puntarenas in 
Costa Rica and mentioned the presence of two dorsal cirri. 
Meanwhile (1857) Kinberg *), probably unacquainted with the 
last named species, published a new diagnosis of the genus, 
in which not only the characteristical situation of the anus 
was not mentioned, but also added to it “cirrus dorsualis 
pedis unicus’. It may be presumed, that the worms col- 
lected by him in the neighbourhood of St. Helena and 
considered to be young specimens of N. crinitus, belonged 
to an other genus, because he described the caruncle as 
“suleo longitudinali’’ instead of “crista media praeditus”’. 
Moreover he introduced the new genus Lirione, characterized 
by having “cirri dorsuales utrinque bini’, in behalf of 
two undescribed Amphinomidae, L. splendens from Tahiti 
and L. maculata from Panama. Kinberg therefore published 
1) Beschreibungen neuer oder wenig bekannter Anneliden: Archiv fiir Na- 
turgeschichte, Jahrg. XXI, Bd. I, S. 93. 
2) Annulata Orstediana, Naturh. Foren. Vidensk. Meddelelser, 1856-58, p. 27. 
o 
3) Ofversigt af Kongl. Vetensk.-Akad. Förhandl. Arg. XIV, 1857, p. 11. 
Notes from the Leyden Museum, Vol. X XXIII. 
16* 
