24 SIR CHARLES ELIOT ON THE NUDIBRANCHIATA. 



The edge is smooth, and there seems to be no masticatory process. The radula is 

 colourless and transparent Seen from above, the median teeth (fig. 18) appear as 

 simple, straight, pyramidal spines, rising from broadish bases ; seen from the (fig. 17) 

 side they are slightly bent downwards towards the tip, and somewhat resemble the 

 teeth of Favorinus. They are quite smooth. The first laterals (fig. 19) are rather 

 stouter than the others, but not of a different shape, as in Tritonia. The remaining 

 laterals (fig. 20) are very long and thin, sometimes almost like filaments. They vary 

 somewhat in shape : those nearer the rhachis are more distinctly hamate, those in the 

 outer half of the row have a wavy or almost straight outline. They are difficult to 

 count, as they seem to lie in sheaves, but the number on each side does not much 

 exceed thirty at most. 



The short and broad oesophagus leads straight into a rather small membranous 

 and fragile stomach, almost entirely covered by the liver, and with no trace of 

 plates. The liver is of a pale yellowish colour, covered with a thick layer of the 

 hermaphrodite gland, which is of much the same hue, but still lighter. The albumen 

 and mucous glands are greyish and of moderate size. The spermatotheca is yellow, 

 roundish, small, with a long duct. The vas deferens not much convoluted. The verge 

 is long, pointed, not armed ; as preserved, it is curved at the end. 



Scyllaeo. pelagica, L. 



Ten specimens, captured on 1st July 1904, off floating gulf weed, 33 53' N., 32 27' W. 



They vary in length from 7'5 mm. to 13 '5 mm. The colour is semitransparent 

 white, with occasional minute spots of opaque white and a certain amount of yellowish- 

 brown pigment, found chiefly on the margins and bases of the appendages, and differing 

 in intensity and quality in the different individuals. 



In some specimens there is nothing that can be called a caudal crest, the tail being 

 merely rudder-like, and not raised above the level of the dorsal surface ; but this 

 peculiarity is not accompanied by any anatomical variation from the type, and passes 

 into the normal form through intermediate stages. 



(BOY. soc. EDIN. TRANS., VOL. XLI., 532.) 



