182 Prof. M'lntosh's Notes from the 



bas a head with two comparatively large frontal tentacles 

 and two stumpy palpi with very short terminal segments 

 that only occasionally are visible, two pairs of tentacular 

 cirri, the last with a spine in the dorsal, five pairs of distinctly 

 bristled feet, with more evident dorsal and ventral cirri and 

 slightly brownish spines, besides two rudimentary ones 

 behind and a large pygidium with two caudal cirri. The 

 cirrus of the first bristled segment is elongating, but the 

 bristles are sliorter than in the succeeding foot. The mouth 

 is a wide aperture, followed by the somewhat ovoid proboscis, 

 which is armed with two translucent jaws having three 

 prominent teeth which are proportionately longer than in the 

 adult. The proboscis is narrowed posteriorly and joins a 

 large opaque, yellowish, glandular region, broad and truncated 

 in front and diminishing posteriorly and terminating in the 

 pale rectal part of the gut and its dorsal anus. Tiie opaque 

 glandular region stretches from the space between the second 

 and third feet to the last bristled foot, and shows the groups 

 of oily granules so characteristic of the glands on the walls of 

 the alimentary canal. A pair of slightly opaque ovoid 

 glandular bodies, the segmental organs, lie behind the first 

 complete foot, just in front of the opaque region of the gut, 

 and active ciliary action is occasionally noticed in them. 



In the postlarval form with six bristled feet the eyes are 

 better defined and the palpi, frontal tentacles, and tentacular 

 cirri are larger. The dorsal cirrus of the first bristled seg- 

 ment is the longest in the animal, but there is no spine. The 

 spines are darker, the posterior end remains bifid, and three 

 teeth occur behind the anterior fang in each jaw. 



When seven bristled feet are present the caudal cirri are 

 considerably longer, the last foot (seventh) having a few 

 short bristles, a short dorsal cirrus, two short spines, and a 

 minute rudiment of a ventral cirrus. Behind is an indication 

 of tiie eighth foot as a lateral projection, with a minute 

 papilla representing the dorsal cirrus. Internally is the tip 

 of a minute spine, but no bristles. The ventral of the first 

 tentacular cirrus (opposite the eyes) is a short subulate 

 process ; that of the next segment is indistinct, though, with 

 the exception ot" the caudal cirri, the dorsal is the longest of 

 the series. The bristles of this segment are always short and 

 in contrast with the next segment, which shows the segmental 

 organs immediately behind. Opacities in the corresponding 

 parts of the following feet indicate the early development of 

 these organs throughout. Traces of a fourth tooth behind 

 the great anterior fang of the maxillae are visible. This 

 description might also apply to a postlarval form with eight 



