NEMERTEA. 641 



nemertes chalicophora (? Australia) ; G. palaensis, Pelew Is. Nemertes carci- 

 nophila, and Cephalothrix Galatheae live on crabs, Malacobdella in the pallial 

 cavity of various marine Lamellibranchiata ; they are usually considered to 

 be parasitic. The larger Nemerteans feed on fixed tubicolous Chaetopoda. 

 All are probably carnivorous. Most members of the class have the power 

 of breaking themselves into fragments if irritated. The Schizonemertea 

 when thus self-mutilated or otherwise injured are able to reproduce the 

 head, or to develope a head in connection with a fragment. 



The Nemertea are classified by Hubrecht as follows 



1. Palaeonemertea : no deep lateral fissure on the side of the head. No stylet 

 in the proboscis. Mouth behind the ganglia. Cephalothrix, Carinella, Carinoma, 

 Polia, Valencinia. 



2. Schizonemertea : 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 longitudinal and inner circular muscular 

 coat of the body-wall. Nervous tissue deeply tinged with haemoglobin. Mouth 

 behind the ganglia. Lineus, Borlasia, Cerebratulus, Langia. 



3. Hoplonemertea : one or more stylets in the proboscis. Mouth generally 

 situated before the ganglia. Lateral nerves inside the muscular coats of the body- 

 wall. No deep longitudinal fissures on each side of the head. Amphiporus, Akro- 

 stomum, Drepanophorus, Tetrastemma, Oerstedia, Nemertes, Geonemertes, Proso- 

 rhochmus, Malacobdella. 



Nemertines, Hubrecht, Encyclopaedia Brit. (ed. ix.) xvii. Id. Revision of 

 genera, Notes from Leyden Museum, i. 1879; ii. 1880. Monograph of British 

 Annelids, pt. i., Nemerteans, Mclntosh (Ray Soc.), 2 vols. 1873-74. 



Carinoma, Oudemans, Q. J. M. xxv. 1885 (Suppl.), p. 7. Malacobdella, von 

 Kennel, Arb. Zool. Zoot. Inst. Wurzburg, iv. 1877-78. Monopora (= Borlasia) 

 vivipara, Salensky, Archives de Biol. v. 1884. Pelagonemertes, Moseley, A. N. H. 

 (4), xv. and xvi. 1875. 



Freshwater genera. Tetrastemma aquarum dulcium, &c., Silliman, Z. W. Z. xli. 



1885, p. 70. 



Terrestrial genera. Geonemertes chalicophora, Graff, M. J. v. 1879; G. pala- 

 ensis, von Kennel, op. cit. supra. Tetrastemma Agricola, von Willemoes-Suhm, 

 A. N. H. (4), xiii. 1874. T. rodericanum, Gulliver, Ph. Tr. 168, 1879. 



Anatomy and physiology, Hubrecht, Niederland. Archiv f. Zool. ii. 1874; cf. 

 Q. J. M. xv. 1875; Id. Z. A. ii. 1879; Dewoletzky, Z. A. iii. 1880. Nervous 

 system, ciliated grooves and canals, Hubrecht, Q. J. M. xx. 1880. Circulatory and 

 excretory systems, Oudemans, Q. J. M. xxv. 1885, Suppl. (with lit.). Cf. Ancestral 

 Form of Ckordata, Hubrecht, Q. J. M. xxiii. 1883. 



Development of Lineus obscurus (= Desor's larva), Hubrecht, Q. J. M. xxvi. 



1886. Structure and metamorphosis of Pilidium, Salensky, Z. W. Z. xliii. 1886. Id. 

 Monopora, supra. 



Hubrecht is stated to be preparing a monograph of the Class in ' The Fauna 

 and Flora of the Gulf of Naples.' 



T t 



