41 199 



(B. arborescens, Pease; B. Hancockana, Kelaart; B. Adanisn, Gr.; B. Hermann i, Angasi 

 are likely to belong to the typical species, the Bomella digitata l ) 



1. Bomella digitata, Ad. et Reeve. 



Bomella digitata, Adams et Reeve. Voy. of the Samarang. 1848. p. 67. PI. XIX, fig. I. 



— , Ad. Ald. et Hanc., notice of nudibr. moll. Trans. Zool. soc. V. 1866. p. 139—141. 



PI. XXXIII, Fig. 8-9. 



— , Ad. Bgh. I.e. 1874. p. 301— 308. Taf. XXXVII, Fig. 14-19; Taf. XXXVIII, Fig 13—22. 



PI. Ill, Figs. 1—3. 



Of this species 4 specimens were taken on March 2 nd , 1900 at Koh Kram at a 

 depth of 30 fathoms. Two of these specimens were sacrificed for the anatomical 

 examination. 



They are said, when living, to have been beautifully red with white transverse 

 bands on the back, and with white rings on the dorsal papillae. 



The specimens which were kept in spirit, were upon the whole more or less pale 

 yellow, with no trace of the former splendour. The length of the three largest was 6 cm , 

 by a height of the body of up to 1"4 — l - 5 cm , and a thickness of up to 0'9 cm ; the height 

 of the tentacles was 2 - 5 mm , that of the first dorsal papilla 9 — 13 mm , of the following ones 

 about the same, that of the last ones 3 mm ; the breadth of the foot was anteriorly 5 mm , 

 posteriorly smaller. 



The form was as usual. The singular tentacles were formed of 10 — 12, also 

 18 — 19 somewhat conical papillæ, placed in 2 — 3 narrow curves or circles. The sheath 

 of the rather high rhinophores was always produced into three fingers; the club had 

 a height of 4 mm , and was provided with about 30 leaves on either side; the first finger- 

 shaped papilla which was coalesced with the rhinophore, was of about the double 

 height of the club. No appendages were found outside at the base of this papilla, nor 

 at the base of the following ones. The second papilla had 3 strong fingers and 

 2 branchial tufts inside at the base. In the interval between this papilla and the fol- 

 lowing one at the margin of the back, or more inwardly, the sunken anal opening is 

 found, and inside of this the renal pore. The third papilla had also three fingers, one 

 of which was also sometimes forked in the end, and two gills; the fourth had two or 

 three fingers, one of which, in one specimen, was again divided into three fingers, it had 

 two to three gills; the fifth papilla was simply formed as a finger or had two fingers, 

 with 2 — 3 gills; the sixth was simply finger-shaped or had two fingers with one or two 

 gills. Medianly on the here narrow back were still found a seventh and eighth papilla, 



') Comp. R. Bergh, System der nudibranchiaten Gasteropoden. Malacolog. Unters. Heft. XVIII. 1892. 

 p. 1053—1054. 



