24 CATALOGUE OF CEPHALOPODA. 



Sciadephorus Mulleri Reinh. Sf Frosch Kong. Dansh. v SelskJ 



Naturv. xii. t. 1, 2. 1846. 

 Hob. Coast of Greenland. 



Fam. IL PHILONEXID^. I 



Body oblong. The ventral portion of the mantle free, supported^ 

 by a button on to the lower part of the siphuncle, fitting intc*- 

 a transverse cavity in the inner surface of the mantle. Ventral 

 opening very large, extending on the sides of the neck. Cer- 

 vical band narrow. 



Head moderate. Eyes large, prominent, without any beards. 

 External ear without any crest, on the side of the neck, 

 behind the eyes, and above the cervical band. Aquatic pores, 

 two, four, or six ; two on the head above, two anal below, or twc^ 

 on each side, and sometimes some small ones at the base of the 

 head, which is enclosed in the mantle ; the larger cephalic and 

 anal pore communicating with a large cavity placed under the 

 head, and passing above the eyes ; sometimes this cavity is sepa- 

 rated into two by a medial line. 



Arms elongate, tapering, not crested, simple at the end.^ Cups 

 fleshy, pedunculated, very extensible, subcylindrical, in two 

 rows, sometimes far apart. 



Siphuncle broad, short, without any upper band or internal valve. 



Shell none, neither internal nor external. 



Pelagian, living on the high seas. Crepuscular or nocturnal, 

 eating floating mollusca. 



Philonexidee (pars) D'Orh. Moll. Viv. et Fos. i. 199. 1845. 



Philonexiana Gray^ Froc. Zool. Soc. 1847. 



Synopsis of Genera. 



1. Philonexis. Arms free. 



2. Tremoctopus. Arms, upper pair webbed. 



1. PHILONEXIS. 



Arms free, tapering, unequal.— Nocturnal. Above the eyes blue 

 Philonexis D'Orh. Ceph. Acet. 1839, Moll. Cuba, i. 7. 21. 184; 



Voy. Amer. Merid. 1835, Ann. Sci. Nat. xvi. 1841. > 



Philonexis (pars) D'Orb. Moll. Viv. et Fos. i. 200. 1845 ; Gra 



Froc. Zool. Soc. 1847, 205. n. 797. 

 Philonexus D'Orb. Gray, Syn. B.M. 87. 98. 1842. 

 Octopus sp. Blainv. Ferussac. 



