86 PROCEEDINGS OF THE ACADEMY OF [1879. 



quasi alatse, bursa cnulophora nulla. Anus dorsualis dextrorsum, 

 apertura genitalis gemina. Mandibulse cymbiolatse, processu mas- 

 ticatorio breviore subhamato, margine masticatorio sat grosse den- 

 ticulate Lingua elongata, compressa, serie dentium unica ; dentes 

 arcuati, cruribus augustis, acie cuspide proininulo et utrinque 

 denticalis compluribus. 



For the general characters of the genus the reader is referred 

 to my monograph (1857) and to the above cited publications 

 (1873). 



The animals are pelagic, but few species are yet known, which 

 besides are not well distinguished, and may perhaps prove to be- 

 long to one circumaequatorial and cosmopolitan form. 



They are: 



1. F. marina (Forsk.) M. Atlant. mediterr. 



2. F. pinnata (Eschsch. ) M. Pacific, sept. 



Bergh, 1. c. xxiii. p. 606, 1873. 



3. F. longicauda (Quoy and Gaim.) M. Pacificum. 



4. F. ? alba (Van Hasselt) M. Indicum. 



I. Fiona marina (Forsk.), var. parifica Bergh. Plate I. fig. 7-8. 

 Limax marina, Fiirskal. 

 Fiona nob His, Hancock and Embleton, 1. c. 

 Fiona atlantica, Bergh, 1. c. 

 Hymenaeolis elegantissima, A. Costa, 1. c. 



Color caerulescente-purpureus (Dall). 



Hab. Oc. Pacificum, Atlanticum, Mediterraneum. 



A single individual of this species was taken by Dall in 1873, 

 in the open sea five hundred miles west of San Francisco, Cali- 

 fornia, feeding on Yelellse. 



According to Dall the color of the living animal was blue pur- 

 ple {like Janthina communis ; D.). 



The individual, not too well preserved in spirits, was about 

 12.0 mm. long, 5.5 high, and 6.0 mm. wide in the broadest part. 

 The front of the foot was 3.75 mm. broad, the tentacles 1.0 mm. 

 long, the rhinophoria 1.25 mm., the papillae of the back 2.5 mm. 

 The color (in spirits) light yellowish-brown, the viscera indis- 

 tinctly perceptible through the walls of the body. 



The form of the body was rather stout; 1 the head flattened, 

 rather broad, broader than tentacles, 2 which are pointed and some- 



1 Cf. 1. c, 1858, Tab. I. f. 1. 2 cf. 1. c, 1858, Tab. I. f. 1-2. 



