PREFATORY NOTES. 



The North Atlantic is here regarded as limited by Lat. 35 N., 

 or as extending a little to the South of the Strait of Gibraltar on 

 the Eastern and to about Cape Hatteras on the Western side. 



The Tunicata contain a large number of type specimens 

 described by Alder and by Hancock, while many other typical 

 specimens have been received from the describers, Heller, 

 Traustedt (from the Copenhagen Museum), Garstang, Verrill and 

 Van Beneden. 



The Gephyrea embrace some types received from Koren and 

 Danielssen. 



The Annelida are the most imperfect portion of my collections. 

 There are only a few typical specimens among them ; these have 

 been described by Hansen, Levensen and Verrill. 



The Ccelenterata contain types received from authors or 

 described from my collection by Alder, Allman, Lorenz, Verrill, 

 Levensen, Bergh, Bourne, Heller, &c. It also embraces the 

 collection which was bequeathed to me by the late Mr. George 

 Barlee. 



A few of the Ccelenterata in the following list which are from 

 beyond this limit, namely, from the Madeiran Province, have the 

 letter M after the name in order to signify their habitat. 



A. M. NORMAN. 

 THE RECTORY, 



HOUGHTON-LE-SPRING, R.S.O., 



Co. DURHAM. 

 November 18, 



