the future to establish the truth about these forms. They are: Dentalitiiu transver sostriatiim 

 which bears a great resemblance to I). cardiiiis Dall a West Indian species, Dentalhivi carnai)ii, 

 greatly resembling D. inmimerabile Pilsbry & Sharp, and reported from Panama Bay and Lower 

 California and Cadttht.s hexaschistus resembhng Cadulus spectabilis Verrill, reported from the 

 Atlantic, east of New Jersey and near St. Vincent, W. Indies in 464 fms. 



This Report only means to give a systematic outline of all the Scaphopods occurring 

 in the above defined area. For anatomical data I refer to the following list : 



1825. Deshayes. Monographie du Genre Dentale. Métn. de Ia Soc. d'Hist. Nat. de Paris, II. 



1856. Lacaze-Duthiers, H. Histoire de I'organisation et du developpement du Dentale. Annales d. Sc. 



nat. Zoölogie, Tomé VI, p. 225 and p. 319. 



1857. The .same. Tomé VII, p. i and p. 171. 



1889. FOL, H. Sur {'anatomie microscopique du Dentale. Arch. de Zool. expér. et gén., Ser. 2, Tomé VII, 



1889. p. 91. 

 1892. Plate, L. Über den Bau und die Verwandtschaftsbeziehungen der Solenoconchen. Zool. Jahrb. 



Bd V, p. 301. 

 1892 — 94. SiMROTH, H. Scaphopoda. Bronn's KI. und Ordn. d. Tierreichs, Bd III, p. 356. 



1894. Bemerkungen über die Morphologie der Scaphopoden. Zeitschrift f. Naturw., Bd LXVII, p. 239. 



1898. Pelseneer, P. Recherches morphoiogiques et phylogénétiques sur les Mollusques archaiques. 



Gand p. 58. 

 1903. BOISSEVAIN, M. Beitrage zur Anatomie und Histologie von Dentalmni. Jenaische Zeitschr., Bd XXXVIII, 



N. T. XXXI. 



I only want to call attention to the fact that many authors apply to the .shell the 

 terms dorsal and ventral contrary to the position of the living animal. 

 The tubular shell, open at both ends and posteriorly attenuated is 

 generally slightly curved. The outer or convex curve, answers 

 to the ventral, the inner o r concave curve to the dorsal 

 side of the livin^ animal. The figure shows the animal in its natural 

 position; anteriorly it bores itself into the mud or sand, inclining 

 on the ventral face. 



My work has been greatly facilitated by the excellent Monograph on the Scaphopods of 

 Messrs Pilsbry & Sharp, published in the year 1897. I have foliowed this book in its general 

 outline, keeping with only few exceptions the same divisions and subdivisions. Also have I 

 made use of Mr. Pilsbry's translations when a diagnosis of a species was published in an other 

 language than English, and some of the keys with some slight alterations have been taken 

 from it. bi a few cases of long and well-known species I have saved myself the trouble of 

 controlling the long list of literature but have simply transcribed parts of it on the authority 

 of Mr. Pilsbry. 



I want to thank Mr. E. A. Smitii for the kind assistance he gave me during my visit 

 at the Pritish Museum, a visit I shall always keep in grateful remembrance, and Mr. Sidney 



