27 185 



The dark yellow brown labial plate was strong , of a length of 0'6 mm , by a breadth of up 

 to - 2 mm ; its elements (flg. 23) of the common hook-shape, split at the end, of a length 

 of up to 0"02 mm . The tongue was of the common form; in the radula were found 14 

 and 18 series of tooth plates, in the sheath 16 and 14, and thus the total number of 

 series was 30 — 32. In the series up to about 40 — 50 tooth plates were found. The 

 plates (fig. 24) were very light yellowish, the hooks attained a height of up to , 02 mm . The 

 innermost one had one denticle on the inner edge of the hook, and 2 — 3 denticles on 

 the outer edge; in the following plates the hook-edge showed 8 — 10 denticles, while the 

 outermost ones only were denticulated in the point. 



The salivary glands were long, whitish. 



The digestive as well as the sexual organs were as in other Chromodorididae. 



Casella, H. et A. Adams. 

 Casella atromarginata (Cuv.). 



Doris atromarginata, Cdt. Ann. du mus. IV. 1804. p. 473. pi. 2, fig. 6. 



— Cut. Quoy et Gaim., Voy. de l'Astrolabe. II. 1S34. p. 251, pi. 16, flg. 6—7. 

 Casella Gouldii. H. et A. Adams. The genera of recent moll. II. 1858. p. 57. pi. 63, fig. 5. 



— philippinensis, R. Bergh. Malacolog. Untersuch. Heft. VI. 1874. Taf. XXIII, Fig. 1. 



— atromarginata, Cüv., R. Bergh. Neue Nacktschnecken der Südsee. Journ. d. Mus. Godefl'ro\. 



Heft. VI. 1874. p. 102—109. Taf. II, Fig. 15—29, Taf. III, Fig. 21—32. 



— — Cuv., R. Rergh, 1. c. Heft. XVII. 1890. p. 942—943. Taf. LXXXVI, Fig. 2; Taf. LXXXIX, 



Fig. 23-24. 



Of this form which oftener (1874, 1890) has been examined by me, one specimen 

 was taken (together with Marionia chloanlhes) on March 3 d . 1900 at Koh Kram. 



The specimen kept in spirit showed the back and the sides reddish brown , for 

 the greater part white dotted; the dorsal brim was as usual. The length of the highly 

 contracted and refolded animal was 2-8 cm , by a breadth of l-5 cm , and a height of I-2 om . 



The mantle edge of the animal was quite as in the typical Cas. atromarginata; 

 nevertheless the possibility is not precluded that it may belong to the Cas. cincta 1 ) found 

 in the western part of the Indian Ocean. 



') Comp. R. Bergh, malocolog. Unters. Heft. XVI, 2. 1SS9. p. 83S— 841. Taf. LXXVII, Fig. 9. 



D. K. D. Vidcnsk. Sclsk. Skr., 6. Række, naturvidonsk. og mathem. AfJ. XII. 2. 24 



