Gaily Marine Laboratory^ St. Andrews. 383 



The anus is median and is crenate from papillae, and several 

 of the caudal segments are devoid of gills. 



The third stage, also obtained between tide-marks at Loch- 

 maddy in August, is about 11'5 mm. in length, and the same 

 general shape is maintained. It agrees with the form 

 described by Prof. P. Fauvel * in his disquisition on the 

 Clymenidian and Branchiomaldane stages in the development 

 of Areiiicola. There are about forty pairs of gills, but the 

 caudal segments devoid of them are more numerous. Except 

 the first simple gill, all show secondary processes, especially 

 anteriorly, where they form sliort branched tufts. Moreover, 

 another example of the same length had somewhat longer 

 gills in front, whilst a third agreed with the first. The 

 fourth stage is 16 mm. long, and the body is more attenuate. 

 It also was found in August at Salthill, Co. Dublin. The 

 pigment is boldly marked anteriorly, the snout in front of 

 the nuchal grooves being dark brownish (in spirit), whilst 

 the pale grooves form a broad N/ with the concavity forward. 

 A dark brown belt succeeds, with a paler area behind. Then 

 three blackish-brown segments follow, whilst the rest of the 

 body is pale brown. The bristle-tufts and the rows of hooks 

 are respectively marked by pale areas and pale bands, the 

 latter continuing a considerable distance along the posterior 

 or branchial region, which is now nearly half the entire 

 length. The gills are longer and more distinctly branched. 



3. On the same Families of Annelids in the 'Porcupine * 

 Ea-peditions 0/1869 and 1870. 



Very few examples of the three families occurred in these 

 collections, only Ammotrypane auloc/aster, H. ii., being 

 present in the expedition of 18G9 ; yet one or two rare forms 

 were procured. 



Thus a Travisia, viz. T. gravieri, sp. n., was dredged at 

 Station 9 in the ' Porcupine' Expedition of 1870, lat. 48° 06' 

 N., long. 9° 18' W., at a depth of 539 fathoms, on a bottom 

 of grey mud and a temperature of 48°. It is a small form 

 resembling the larva of one of the Diptera, and measuring 

 about 5 mm. in length. The head terminates in a smooth 

 pointed process, the body gently dilating thereafter and 

 continuing as a rounded ringed sac to the posterior end, 

 where a slight diminution occurs before it somewhat abruptly 

 terminates. The rings in the contracted posterior region 

 encircling the central caudal process are distinct. The dorsal 



• Bullet. Sc. Fr. el Bflfr, t. xxxii. p. 287 (1809). 



