14 Historischer Ueberblick. 
Anopla. 
Fam. 2. Lineidae. — Ganglia elongated. Muscular layers of the 
body-wall three in number, viz. external longitudinal, eircular, and internal 
longitudinal. Proboscis furnished with five coats, viz. external elastic, 
longitudinal and accessory bands, eircular, basement and glandular layers. 
Snout with a deep lateral fissure on each side: Lineus, Borlasia, Cere- 
bratulus, Mierura, Meckelia. 
2 
Fam. 3. Carinellidae. — Lateral nerves placed between the basement- 
layer of the eutis and the external (eircular) museular coat of the body- 
wall, or in the substance of the longitudinal layer close to the eircular. 
There are only two muscular coats. The proboscis has four layers, viz. 
external elastie, circular, longitudinal and glandular: Carinella, Valereinia. 
Fam. 4. Cephalothrieidae. — Commissures of the ganglia separated 
by a distinet antero-posterior interval. Lateral nerves placed between 
the longitudinal museular coat and an isolated inner band of fibres. Pro- 
boseis has an external circular (or elastic), an internal longitudinal, and 
a glandular layer supplied with acieular papillae: Oephalothrix. 
Diese Eintheilung ist im Verein mit der von Schultze bis auf 
heute grundlegend „geblieben. Freilich wurde sie schon wenige Jahre 
später von Hubrecht wesentlich abgeändert und erweitert. 
Hubrecht theilte nämlich 1879 (No. 154) die Nemertinen in drei 
Ordnungen ein. 
I. Palaeonemertini. No deep lateral fissure on the side of the 
head. No stylet in the proboseis. Mouth behind the ganglia: Gen. 
Cephalothrix, Carinella, Valeneinia, Polia. 
II. Sehizonemertini. A deep longitudinal lateral fissure on each 
side of the head, from the bottom of which a ciliated duct leads into 
the posterior lobe of the ganglion. Lateral nerves between the longi- 
tudinal and inner eircular museular coat of the body-wall. Neryous tissue 
deeply tinged with haemoglobine. Mouth behind the ganglia. Gen. 
Lineus, Dorlasia, Cerebratulus, Langia. ® 
Ill. Hoplonemertini. One or more stylets in the proboseis. Mouth 
generally situated before the ganglia. Lateral nerves inside the museular 
coats of the body-wall. No deep longitudinal fissures on each side of 
the head: Gen. Amphiporus, Drepanophorus, Tetrastemma, Prosorhochmus, 
Oerstedia, Nemertes. 
Hubrecht’s Eintheilung ist eine Modification von M. S. Schultze’s, 
denn seine Hoplonemertinen sind identisch mit den Enopla und die 
Anopla wurden von ihm in die Paläo- und Schizonemertinen zerlegt. 
