PTBROPOD4 



These specimens found by the ' Discovery ' seem referable to Cl. aiifttrctica, E. A. 

 Smith (/.<*.). They can hardly be identified with Cl. longicatulata, Cl. flavewfn* or 

 Cl. punctata, because those species, though imperfectly known, arc said to have only one 

 or two, and not three pairs of buccal cones. In my opinion they arc also specifically 

 distinguishable from Clione linutciiui, though the species are, no doubt, nearly allied. 

 The superficial difference in appearance is striking, and the divergent characters of the 

 two species may be tabulated as follows : 



CLIOKK LIMACIXA. 



1. A specimen 1* mm. long consists of 2*5 mm. 



head and fins + 15 '5 body. 

 The broadest part of the body is jnst behind 

 the fins, and as far as there is a neck it is 

 between or above the fins. 



2. Specimens 40-45 mm. in length are frequent. 



ANTARCTICA. 



1. The part of th body behind the fins is shorter 

 than in the Arctic form. A specimen 18 mm. 

 long consist* of 6 mm. head and fins + 

 12 mm. body. 

 There is a distinct neck behind the fins. 



B. Considerably smaller than the Arctic form. Pew 

 individuals exceed 20 mm., even when arti- 

 ficially extended. E. A. Smith gives 22 mm. 

 as the length ; presumably the maximum of 

 his specimens. 



8. The integuments are thicker, firmer, and less 

 transparent than in the Arctic form. In 

 most specimens they are plentifully be- 

 sprinkled with opaque yellow spot*, some- 

 times a little raised. 



4. Three, or at least two, larval rings are habitually 



present in individuals measuring 15 mm. or 

 more in length. 



5. The base of attachment for the anterior lobes 



of the foot is a narrow band. The posterior 

 lobe is larger and stouter in proportion to the 

 anterior lobes than it is in Clioiu limatina. 



6. There is an interval between the dorsal cone 



and the other two. The median cone is the 

 largest. 



7. Median tooth very small, and present only in 



hindmost rows of radnla. Laterals in hind- 

 most rows have forked bases. The number 

 of laterals gradually increases from 8 to 8, 

 the innermost teeth of the half row being 

 sometimes rudimentary. 



8. Penis small, and presence of accessory organ 



doubtful, though not disproved. 



9. The visceral mass extends backwards almost 



into the posterior third of the body. 



3. The integuments are thin and transparent. 



Though spoU are present they arc not con- 

 spicuous, and as u rule can only be aeon when 

 carefully sought for. The whole animal is 

 flabby, and almost gelatinous. 



4. No larval rings found in individual* measuring 



as much as 10 mm. When traces of the 

 posterior ring are fonnd in small specimens it 

 is not shaped as in C'lioiu antarrtita. 



5. The base of attachment for the anterior lobes is 



broad. 



6. The cones are equidistant. The dorsal 

 largest and the ventral smallest. 



is the 



7. Median tooth larger, and present in all or most 



rows. Laterals with forked bases not fonnd. 

 The number of laterals does not increase so 

 markedly, and the rudimentary teeth are 

 fonnd at the onter ends of the row*. 



8. Penis proportionately much larger, and provided 



with a large accessory organ. 



9. The visceral mam is more compact and rounded, 



extending only a little way behind the fins. 



