150 Prof. M'Intosli's Notes from tie 



foot has iu the ventral division four great flattened golden 

 bristles with strong blunt points (PI. V. fig. 1 c) attached to 

 the massive setigerous region, a comparatively large lanceo- 

 late lamella occurring superiorly, whilst at the ventral edge 

 is a small papilla. In the developing organs tlie i)oints are, 

 as usual, first formed. The dorsal bristles form a row supe- 

 riorly, and consist of bristles similar to those in front, though 

 shorter (PI. V. fig. 1 e). They taper from the base to the 

 tip, which is very attenuate, yet they make a somewhat rigid 

 pencil or fan. Both they and the ventral bristles are en- 

 crusted with very small particles which obscure their minute 

 structure. 



The next segment is narrow and has a broad though 

 narrow dorsal lamella which is lateral in position — that is, 

 lies directly above the foot, — and its bristles are directed 

 upward in front of it. No ventral bristles are present in 

 the specimen. 



The following three feet are similar, viz., each having a 

 broad and vertically n arrow" dorsal lamella, with a bristle-tuft 

 in front on the dorsum and a well-marked and increasingly 

 massive ventral division, bearing a tuft of bristles the central 

 series of which is often abruptly truncated below the tip. 

 These bristles (Pi. V. fig. 1/) are rather strong, straight, 

 narrowed from the base distally, have a slight' curvature 

 below the tip, which is tapered to a fine point and feathered 

 ■with a series of spikes. C)ne of the stouter forms from this 

 region is represented in fig. ] g. 



]3ehind the foregoing the dorsal lamella, which has the 

 form of a vertical plate, moves further inward on the dorsum, 

 and by and-by considerably diminishes in size, as also do the 

 feet at the posterior end of the fragment, from which the 

 proboscis projects posteriorly. The dorsal bristles of this 

 region (PI. Y. fig. 1 h) have long shafts and finely tapered 

 tips. 



The head in this form differs from that in iSclerocheilvs in 

 the absence of the anterior processes and in the absence of 

 eyes. No protrusible and ciliated nuchal organs are visible 

 at the base of the snout as in Sderocheilus. The presence 

 of the caruncle with the small tentacle behind it also separates 

 Nevaya from Sclerucheilus, whikt in certain features it 

 approaches Nerine. The buccal segment in the latter is 

 achsetous. The second segment in Sclerocheilus bears 

 dorsally and ventrally capillary bristles, and a little below 

 (" au-dessus^') the ventral papilla five or six powerful golden 

 hooks, which De St. Joseph ^ thinks enable the animal to 

 * Ann. 8c. Nat. 8' i€v. xvii. p. 106. 



i I 



