14 



SIR CHARLES ELIOT. 



the rhinophores could possibly be retracted. The posterior part of the body cavity is 

 filled by the large bluish-green liver on which lies the yellowish fern-like renal organ. 

 Across the blue mass runs the yellowish intestine from left to right (rising from under 

 the left side) and then backwards. In front lie the central nervous system and the 

 genital mass, both yellowish. The hermaphrodite gland is completely hidden under 

 the renal organ. 



Though the internal organs are mostly well preserved, some have fared badly. 

 The pericardium is represented by a thin, dried, pear-shaped membrane adhering to the 

 dorsal wall from which it can hardly be detached. In front of the liver there lies over 

 the pharynx a hard yellow mass consisting of two triangular lobes each measuring 



FIG. 12. Bathydoris Iwdgsoni CENTRAL NERVOUS SYSTEM: a CEREBRAL GANGLIA; 6 PLEDRAL GANGLIA; 

 c PEDAL GANGLIA ; d COMMISSDRE ; e BUCCAL GANGLIA. 



about 12 mm. x 10 mm. The central nervous system is embedded in this mass, which 

 probably consists of the blood gland and the salivary glands fused together, but its 

 character could not be more accurately determined. 



The central nervous system (Fig. 12), which is well preserved, is much as described 

 by Dr. Bergh for B. abyssorum and B. ingolfiana, and is remarkable for the separation 

 and distinctness of the component ganglia. The cerebral ganglia are broader in front 

 than behind, and notched on the outer side. The pleural are smaller and rounder, the 

 pedal pear-shaped. The cerebral and pedal ganglia give off at least five nerves each 

 and the pleural at least three. The buccal ganglia are round, and lie at the sides of the 



