24 
CATALOGUE OF CEPHALOPODA. 
Sciadephorus Mulleri Reinh . Sf Prosch Kong. Dansk. v , Selsk. 
Naturv. xii. t. 1, 2. 1846. 
Hab. Coast of Greenland. 
Fam. II. PHILONEXI DM. 
Body oblong. The ventral portion of the mantle free, supported 
by a button on to the lower part of the siphuncle, fitting into 
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 two 
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. 
Philonexidae (pars) U Orb. Moll . Viv. et Fos. i. 199. 1845. 
Philonexiana Gray , Proc. Zool. Soc . 1847. 
Synopsis of Genera . 
1. Philonexis. Arms free. 
2. Tremoctopus. Arms, upper pair webbed. 
1. PHILOKEXIS. 
Arms free, tapering, unequal. — Xocturnah Above the eyes blue. 
Philonexis H Orb. Cepli. Acet. 1839, Moll. Cuba , i. 7. 21. 1841, 
Voy. Amer. Merid. 1835, Ann. Sci. Nat. xvi. 1841. 
Philonexis (pars) TP Orb. Moll. Viv. et Fos. i. 200. 1845 ; Gray , 
Proc. Zool. Soc. 1847, 205. n. 797. 
Philonexus*D’ Orb. Gray , Syn. B.M. 87. 98. 1842. 
Octopus sp. Blainv. Ferussac. 
