CLASSIFICATION. 
Verm. 3 
Amphistomidea ; 3, Distomidea ; 4, Polystomidea ; 5, Tristomidea ; 6^ 
Gy rodacty tided . 
The Turhellaria beside (a) Dendroccela, and (b) Rhabdoccela, are made 
to include (c) Nemertini ; and these sub-orders respectively include (a) six 
families- -udccncfa, Pseudocerida^ Prosthocerida, ‘ Notocei'ida, Carenotc^ 
and Planariida ; (b) five families — Microstomida, Pharyvgea, Apharyngea^ 
Rhynchoproboli, Catenulidce (Schraarda) ; and for (c), McIntosh’s families 
are given — Cephalothricidce, CarinelUdce, Lineidce^ and Amphiporidm. 
The NematoTielminthes include three orders, with the following 
families ; — 
I. Acanilioceptiali. 
II. Gordiacea . . .1. Sphcerularida. 
2. Gordiida. 
3. Mermithida. 
III. Nematodes . . .1. Urolabea. 
2. Anguillulidea. 
3. Hedruridea. 
4. Phy Salop teridea. 
5. Chiracanthidea. 
6. Ascaridea. 
7. Filaridea. 
8. Cephalota. 
9. Dacnidina. 
10. Spiruridea. 
' 11. TrichotracTielidea. 
12. Strongylidea. 
Appended to this class, ns forms incertfe sedis^ are Cystoopsis arjpenseri^ 
Wagn., JCi'hhwdcrcs, DesmosroleXy and Chn’iosoma. 
1’ho Gephyrea aro divided into throe families : Siptmetdida, Priapulida, 
and Echiurida. 
The Annelides are thus set out : — 
Sub-class. Orders, Families. 
I. Discophori . . . . . , . .1. Malacobdellea. 
2. Ilistriobdellea. 
3. Acanthobdellea. 
4. Clepsinca. 
5. Branchiobdellea. 
6. IJirudinea. 
II. Chcetopoda . I. Oligochceta . a. 0. ierricola . 1. Lumbricidm. 
B. 0. Umicola . 2. Phreoryctidee. 
3. Tubificidee. 
4. Enchytreeidee. 
5. Naidem. 
II. Onychopliora.^' Sub-orders. 
III. Polychceta . .1. Ectoparasita. 
2. Sedentaria, 
3. Nereidce. 
* Prof. Hayek seems to be in ignorance of Mr. Moseley’s researches on Peripatus. 
Whatever are the exact relationships of Peripatus, there is now, and can be, no 
