NOTES ON OLIGOCHMTES. 67 
wa ee ee eee 
3S mld 2 : ae < 
Ssh1[4/ 8 |/eele8/35/2] = | £8. | 2. 
Sas | 8 | 2 1es|8e (se) 5 don | Se 
AFS | 4)/ RA /OS/AeEl/das\|H) Aas As 
1. Cuticle of Lum- 
IDM WI Q All Ge —;/—}] +] +] + [+l + Pale Pale 
2. Cheete of Vermi-; yellow. | pink. 
culus and En-' 
chytreus). =. .| = —-!—-/]-]-—-]-— —-| — | Orange.| Red. 
3. Chete of Lum- 
WINGER > o « of = ~!|—|—|{—]-— j\-| +. | Orange. | Red. 
with 
| insol. 
resi- 
due. 
From this table it would again appear that we have three 
albuminoid substances distinct from each other, and from those 
found in the coelomic corpuscles. The chete of the small 
worms (Vermiculus and Enchytreus) are formed of a substance 
which is not chitin, since it is insolublein HCl. The chetz 
of Lumbricus, on the contrary, are probably chiefly composed 
of chitin, or some substance closely allied to it, since they are 
insoluble in caustic potash, and partially soluble in HCl. On 
the other hand, so far as the solubilities show, the cuticle 
appears to be formed of a substance closely allied neither to 
chitin nor to mucin. 
List oF WORKS REFERRED TO. 
1. Bepparp, F. E.—‘‘ A Contribution to the Anatomy of Sutroa,” ‘Trans. 
Roy. Soc. Edinb.,’ vol. xxxvii, 1892. 
2. Bepparp, F. E.—‘ Monograph of the Order Oligocheta,’ Oxford, 1895. 
3. Biomrretp, J. E.—‘The Thread-cells and Epidermis of Myxine,” 
‘Quart. Journ. Mier. Sci.,’ vol. xxii, 1882. 
4. Bousius, H.—* L’Organe segmentaire d’un Enchytreide,” ‘Mem. d. 
Acad. Pont. d. Nuovei Lincei,’ vol. ix, 1893. 
5. CuarparkpE, E.—‘ Annélides, Chétopodes du Golfe de Naples,’ Geneva, 
1868. 
6. E1stc, H.—‘ Die Capitelliden des Golfes von Neapel,’ Monog., Berlin, 
1887, 
