530 Prof. M'lntosh's Notes from the 



vertical ridge slightly divnded into a dorsal and ventral 

 division, and from each of these springs a remarkably long 

 tuft of the characteristic golden bristles wliich stretch far in 

 front of the animal and refract the light beautifully. From 

 the forward and upward direction of these bristles they would 

 not appear to be of much service on a flat surface, but they 

 would be of use on the wall of a tube or tunnel, as well as 

 protect the branchiae and palpi. Similar but shorter bristles 

 follow in the dorsal division throughout the body. Moreover, 

 in the fourth segment the ventral series consists of stout spines 

 with a double curve, some of which, however, have slender 

 translucent tips — indicating that the succeeding and more 

 perfect hooks are only modiiications of an articulated bristle. 

 Small examples about an inch in length differ from the adults 

 (of 4 or 5 inches) in the smaller number of segments, 47 or 

 48 instead of GO-80, and in the less dilated anterior region. 

 It is interesting that the type of bristle seen in this form 

 persists in species from the Indian and other oceans, as 

 shown, amongst others, by Prof. Ehlers * in his recent 

 beautiful work on the Annelids of the German Deep-sea 

 Expedition. 



The second form, Stijlarioides glauca, Mgrn,, has long been 

 known in Zetlandic waters, where it was first obtained by 

 Dr. Gwyn Jeffreys, and it extends to Norway and Sweden, 

 It is distinguished by its smaller size, clavate outline, the 

 })OSterior region sometimes forming in the preparations a 

 narrow moniliform appendage of many segments. The 

 general surface is comparatively smooth under a lens, though 

 studded with long- clavate papilise and encrusted with particles 

 of sand wiiich give a dull greyish appearance in life and in 

 a state of preservation, with a dull bluish region from the 

 intestine. The body-wall is thinner than in S. plumosa and 

 the fasciculi of the dorsal and ventral longitudinal muscles 

 are visible as separate strands. Tliere are six branchiaj, the 

 two lower with filiform tips and devoid of a pale streak in 

 the centre. Two minute brown pigment-specks occur on the 

 process bearing the branchiae, the flattened and crenate palpi, 

 and the mouth. The first series of frontal bristles are trans- 

 lucent, pale, iridescent, and, as compared with those of S. plu- 

 mosa, few in number and boldly articulated. The second series 

 inaugurates the arrangement throughout the rest of the body, 

 viz,, a longer dorsal tuft of articulated bristles, and ventrallj 



* " Die bordensiissigen Amieliden aus den Sanimlungeu der deutsclieu 

 Tiefsee-Expeditiou aut' dem Dampfer ' Valdivia,' " lUuS. 



