MALACOZOA. CEniALOPODA. 23 



OcTocERATA. Blai7iviUe. Okto), eight; Kepara, Jiorns. 



Genus 4. Eledone. — Body sacciform, rounded beliind ; 

 eight arms connected at the base, snd having each a 

 single row of acetabula. EXeScbi/?;, a species of Polypus 

 or Cuttle-fish. Leach. 



1. Eledone Pennantii. — Body globoso-elliptical, mi- 

 nutely granulated and dusky on the dorsal surface ; 

 arms nearly twice the length of the body, tapering to a 

 fine point. Named after Pennant, a celebrated English 

 naturalist. 



2. Eledone Aldrovdndi. — Body elliptical, smooth, 

 white ; arms of the same colour, nearly twice the length 

 of the body, tapering to an extremely attenuated point. 

 Named after Aldrovandus, a celebrated naturalist. 



ORDER II.— CEPHALOPODA SIPHONIFERA. 



Animal with a shell divided into chambers by trans- 

 verse partitions, through which a siphon passes. Sijaho, 

 a tube; fero, to bear. D'Orbigny. 



ORDER III.— CEPHALOPODA FORAMINIFERA. 



Body bursiform, containing the shell in its hind part ; 

 the head very small, terminated by numerous tentacula ; 

 shell many-celled, destitute of siphon, but with one or 

 several holes between the cells. Foramen, a hole ; fero, 

 to bear. D'Orbigny. 



Genus 1. Polystomella. — Shell disciform, subcari- 

 nate, many-ceUed ; the centres umbilicate, the partitions 

 forming grooves, radiating from the centres to the cir- 

 cumference, the turns concealed by the last. IloXvs, 

 many ; (TTOfia, mouth. Lamarck. 



1 . Polystomella crispa. — Shell disciform, equally con- 

 vex on both sides, the last turn with flexuous ridges, 

 having the intervals crenated. Crisjms, curled or waved. 



