CHIROTEUTHIDiE I CHIROTEUTHIS. 
43 
Synopsis of the Genera. 
1. Chiroteuthis. Arms free ; cartilages of the mantle dilated 
below. Rings of cups contracted in the middle. Shell slender, 
dilated at each end. 
2. Histioteuthis. Three upper pairs of sessile arms webbed 
nearly to the end ; cartilages of mantle linear, elongate. Rings 
of cups convex externally. Shell broad, pennate. 
A. Shell narrow , rather dilated at each End. Base of long Arms 
with scattered Cups. 
1. CHIROTEUTHIS. 
Body elongate, conical. Fins on the hinder part of the sides of 
the back. — Head elongate, depressed, narrowed behind the 
eyes, without any cervical crest. Eyes large, prominent ; aper- 
ture oval, not contractile. Buccal membrane thin, seven-lobed ; 
buccal aquiferous apertures six, distinct. — Arms very long. 
Sessile ones conical, subulate, rounded, webbed at the base; 
cups very small globular, oblique, strongly peduncled, in two 
alternate lines ; ring very oblique, with a circular depression. 
Tentacular arms exceedingly long, very slender, cylindrical ; 
with small alternate cups scattered on their whole length. Club 
lanceolate, terminating in a fleshy cup ; sides with a broad mem- 
brane ; cups in four rows, on long cylindrical peduncles swollen 
at the end, and bearing a second pedicle carrying a hood-like 
horny ring edged at the base, with a lateral aperture armed with 
teeth. — Siphuncle short, without superior band or valve. The 
cartilage on the side of the siphuncle oval, transverse, with a 
large tubercle on each side of the oblong cavity ; mantle with 
an oblong cartilage, larger beneath, and with a pit on each side to 
receive the tubercles on the siphuncle. — Shell internal, horny, 
very slender, slightly dilated into a narrow lanceolate expansion 
at each end. 
Chiroteuthis D'Orb. Cephal. Acetab. 1839, Ann. Sci. Nat. xvi. 
1841 ; accidentally confounded with Cirroteuthis Gray, P. Z. 
Soc. 1847, 205. 
Loligopsis sp. Fei'uss. Mag. Zool. 1834; Verany, Acad. Torino. 
1, Chiroteuthis Veranyi. 
Body smooth : fins semicircular, together heart-shaped. Head 
large. Sessile arms very large, . rounded, acuminate, unequal ; 
order of length, 4, 3, 2, 1 ; rings of the three upper pairs with 
very close acute teeth, longest on the broader side. Tentacular 
