384 PROCEEDINGS OF THE ACADEMY OF [July, 



Despite the enormous number of recognized species and the fact 

 t hat no other region of the Pacific has been so diligently investigated, 

 our understanding of the fauna is still so incomplete that this cata- 

 logue can scarcely be regarded as any less provisional in nature 

 than its predecessors. 



As yet we know almost nothing regarding the distribution of 

 this class of animals along the coasts of northwestern Japan and 

 in the Japan Sea, and but little collecting has been done anywhere 

 on the island of Hokkaido. As is to be expected, the neighboring 

 bays of Tokio, Sagami, and Suruga afford us with the bulk of our 

 information, and the vicinity of Misaki has proven a particularly 

 prolific locality. 



Note.— In the following pages the sign ! indicates that specimens 

 from the locality cited have been examined and verified by the 

 present author. Numbers enclosed in brackets have reference to 

 the private card register of the author and are given for purposes of 

 convenience and accuracy only. Mere listing of a species in the 

 various catalogues of Hoyle (1886, 1886a, 1897, 1909) and of Wttl- 

 ker (1910) has not generally been included in the lists of references. 



Class CEPHALOPODA. 



Order DIBRANOHIATA Owen, 1832. 



Sub-order OCTOPODA Leach, 1818. 



Family CIRROTEUTHID^J Keferstein, 1866. 



Genus OPISTHOTEUTHIS Verrill, 1SS3. 



Opisthoteuthis depressa Ijima and Ikeda, 1895. 



Opisthoteuthis depressa Ijima and Ikeda, 1895, pp. 1-15, pi. 33. 

 Opisthoteuthis depressa Meyer, 1906, pp. 758-760 (anatomy). 

 Opisthoteuthis depressa Meyer, 1906a, pp. 183-269 [1-93], pis. 11-16 



(anatomy) . 

 Opisthoteuthis depressa Doflein, 1906, p. 260, fig. 

 Opisthoteuthis depressa Marchand, 1907, p. 3S1, [77] (anatomy). 

 Opisthoteuthis depressa Dollo, 1912, pp. 131, etc., pi. 3, fig. 5. 



Distribution.— 250 fathoms, Okinose Bank, near Misaki, Sagami 

 (type locality). 



Family ARGONAUTID^] Cantraine, 1840.' 

 Sub-family ARGONAUTINiE s. s. 



Genus ARG0NAUTA Linne, 1758. 



The Japanese members of this genus have not yet been carefully 

 worked out, but all three of the names appearing in the literature 

 belong to widely distributed species. 



