Oatty Marine Laboratory, St. Andrews. 45 



brancliije commence on the fifth. The dorsal cirrus is flat- 

 tened, ^vith a filiform process at its outer edire. The anterior 

 rows of ventral bristles are pale, the last three or four with 

 dark brown hastate spines. The rowsof papillse behind the foot 

 are more acutely pointed than in the previous species and are 

 from 8 to 1 2 in number. At the 23rd foot the dorsal division 

 has 4 or 5 spines and a long tuft of slender bristles with 

 finely tapereil serrated tips. Tlie cirrus is narrow and has a 

 tapered extremity. A single spine occurs in the ventral 

 division and a small group of slender bristles, the tips of 

 which are serrated. The blunt setigerous region has a conical 

 lobe to its outer side, whilst at the base externally is a conical 

 ventral cirrus nearly equal in size. 



Another of the series is the widely distributed Scoloplos 

 Miilleri, De St. Joseph, which ranges from the tidal region 

 to 50 or more fathoms, according to the locality. It ex- 

 tends to Northern Europe and the Siberian coast. The 

 acutely pointed head rests on the truncated cone of the 

 peristomial segment. The body is flattened and widened 

 anteriorly, then rounded ventrally and flattened dorsally in 

 its progress to the tail, which has four pa])ill8e at the vent 

 and a pair of long slender cirri. The anterior region has 

 eighteen segments, bearing shorter, stonter, serrated bristles. 

 The shorter curved bristles with blunt tips serrated on the 

 convex side are modifications of the longer series, apparently 

 due to special influences of habitat, and varying much among 

 themselves. Ihey can scarcely be regarded as a separate 

 and distinctive series. The 15th foot has a conical dorsal 

 cirrus or lobe, with a tuft of rather long bristles in front of 

 it, the shafts of Avhich are smooth. The tapering tips are 

 peculiarly spiked, and end in smooth hair-like points. The 

 ventral division has tw'o short conical papillse, one of which 

 is below the bristle-tuft and probably represents the ventral 

 cirrus ; the other is below the dense, deep row of bristles 

 which are shorter than the dorsal, but of the same type. 

 The branchiae commence as small papillae on the 17th bristled 

 foot, attain considerable size at the 20th foot, and almost 

 reach the tip of the tail. Below the foot from the 18tli to 

 the 30th bristled segment (fewer in some) a papilla occurs 

 on the side of the body. 



To Baron de St. Joseph"^, wdio has done such excellent 

 work amongst the annelids of the French shores, belongs 

 the credit of pointing out the differences between the northern 

 species — the typical Scoloplos armiger of O. F. JMiiller — 



* Ann. 8ci. Nat. K^' si'r. v. p. .%(j, pi. xx. fig. 167 (1898). 



