138 WORMS. MOLLUSCA. 21. >28. 29. 



108. L. Encrasicoli. Body cylindrical, horn-colour; head 

 with 2 barbs : ovaries filiform, white. 



Found attached to the bodies of the Clupea Encrasicolus and 

 Sprattus, frequently in Swansea bay. 



Body differing from the last in not tapering to the extremities,, 

 in being of a brown-horn-colour, and in having the oviducts very 

 Jong, filiform, and clear white. 



2T. SEPIA. Cuttle-fish. 



109. S. octopus. Body without tail or appendage: pe- 

 dunculated tentacula or longer arms none : arms be- 

 set with a double row of suckers. 



Br. Zoo/, iv. /. 44. Sow. Mifcell. t. 48. Barbut t. 8./. 1. 



Body growing to a great size, short, inflated at the bafe : arms as 

 long as the body, tapering to a point, clothed with 2 rows of alter- 

 nate fuckers on the inside: fuckers shaped like the cup of ar* 

 acorn, furnished with numerous hooks, 



110. S. officinalis. Body without tail, with a crenate 

 margin each side : peduncled tentacula 2 : arms be- 

 set with 4 rows of suckers. 



Brit. Zaol. iv.p. 55. Barbut t. 8./. 2. 



Body ovate ; the margin interrupted at the bottom : tentacula or 

 longer arms 4 times as long as the others, their tips fpatulate and 

 furnished within with numerous fuckers : arms shorter than the 

 body, ovate, pointed. 



111. S, media. Body cylindrical tapering to a point : 

 tail pointed r finned and carinate each side : pedun- 

 cled tentacula 2. 



Br. Z&al. iv. r. 39. /. 45. Barbut t. 8. /. 3. 



Body ending in a point, furnished with a winged membrane each 

 side commencing below the middle of the body, greenish or 

 brown : eyes blue. 



tl2. S. Loligo. Body cylindrical, furnished with a flat- 

 tish rhombic sharp-edged membrane at the tail : 

 peduncled tentacula 2. 



Mrit. Zool. iv. *. 27. Barbut t. 8./. 4. 



Body reddish-brown, differing from the laft in not gradually ta- 

 pering to a point : eyes blue : dorjpl-bone lanceolate,, iranfparent, 

 shaped like a pen.. 



1 1 3. S. Sepiola. Body rounded at the base y with a roun- 

 ded wing- like process at the base each side : pedun- 

 cled tentacula 2. 



Brit. Zool. t. 29./. 46. Barbut t. 8. /. 5. 



Body not longer than the head and neck : tentacula as long* a» 

 the body j wings nearly circular. 



28. TRITON. 



114: Tr. littoreus. 



Barbut. t. 7. /. 1. Philos. Tram. 50. f. 34./. A. 



Body oval, dilated and lobed at the lower end: head oblong> 

 rounded, not comprefsed, terminated by a tough membrane con- 

 necting all the arms at their bafe : mouth placed at the bafe of the 

 tentacula : probofcis long, tapering to a point, annulate, cartilagi- 

 nous : arms 6 pair, the 3 lower-pair furnished with a moveable 

 thumb, all jointed, involute and ciliate qb the inner-margin. 



29. MEDUSA. ; 



