22 MALACOZOA. CEPHALOPODA. 



two long tentacula ; the body naked, sometimes par- 

 tially enclosed in a shell, 



CephaUpoda Testdcea Monothdlama and No7i-testdcea, 

 Lamarck. KpvirTabios, concealed; Bpdyxi-a, gills. 



Family I. — Sepiina. 



The mantle continuous round the body ; an internal 

 horn or calcareous lamina ; head with eight or ten mus- 

 cular appendages, furnished with acetabula; eyes very 

 large. 



Genus S^pia, Linnaeus. 2r]Tria, Sepia, Cuttle-fish. 



Dececerata. Blainville. Acku, ten; Kepara, Jiorns. 



Genus 1. Sepiola. — Body short, sacciform, rounded 

 behind, with two rounded lobes ; eight sessile arms 

 nearly equal ; two pedunculated arms. Diminutive of 

 Sepia, Cuttle-fish. Leach. 



1 . Sepiola RondeUtii. — Body orbicular, natatory lobes 

 round. Named after Eondelet, a French naturalist. 



Genus 2. Sepia. — Body sacciform, rounded behind, 

 depressed, margined on each side with a narrow mem- 

 brane ; eight triangular fleshy arms, and two pedun- 

 culate arms ; acetabula with entire horny margins ; in- 

 ternal dorsal shell elliptical, lamellar, calcareous. Si^Trta, 

 Sepia, a Cuttle-fish. Linnaeus. 



I. Sepia officincdis. — Body smooth ; pedunculate 

 arms, very long. Named from the bone being sold in 

 officinis, in the shoj)s. 



Genus 3. Loligo. — Body elongated, tapering, mar- 

 gined behind on each side with a broad membrane ; 

 eight long fleshy arms, and two very long pedunculate 

 arms ; acetabula with denticulate horny margins ; inter- 

 nal dorsal shell elongated, horny. LoUgo, a Sleeve-fish 

 or Calmary, Lamarck. 



1. Loligo imlgdris. — Natatory appendages semi- 

 rhomboidal ; tip of the body free. Vulgaris, common. 



