44 Prof. M'Intosh's Notes from the 



illustrated MS. of his which came into my hands in 1872 — 

 after the death of Dr. Baird — a figure of " Arid a MUlleri" 

 from II. Ilathke's ' Beitriige zur Fauna Norwegens' (184:3) is 

 given, as if he had been studying the species. 



Several examples of the family have long hcen known in 

 Britain, the first (Aricia Cuvicri, Aud. & Ed.) being perhaps 

 the most common. Its head is a pointed cone without trace 

 of rings or eyes. A transverse line separates it from the 

 peristomial segment ventrally, whilst dorsally a crescent is 

 cut from the latter at the base. The body is from 8 to 10 

 inches in length, with narrow segments. The peristomial 

 segment is narrow dorsally, but broad ventrally, and the 

 proboscis forms a frilled rosette in extrusion. Posteriorly 

 the body tapers to a blunt point, with the anus at the tip 

 dorsally and with two very long and slender cirri. The first 

 region of the body comprises 21 feet, but these vary con- 

 siderably amongst themselves, commencing with rudimentary 

 feet anteriorly and ending in modified feet towards the 21st. 

 Prom the 6th foot backward the posterior of the three rows 

 of ventral bristles is darker and is composed of spines in- 

 creasing in strength, so that they form a conspicuous series 

 of brown dots. The foot becomes more free and the poste- 

 rior row of papillae more conspicuous, extending ventrally 

 beyond the bristles of the 17th foot. From the 19th to the 

 24th foot these papillte go to the mid-ventral line. The rows 

 of ventral bristles attain their maximum about the 15th or 

 16th foot. The dorsal cirrus increases in size in its progress 

 backward and has an enlargement at the base. The branchiie 

 commence at the 5th foot and are of a rich red colour in life. 

 In the succeeding region of the body (at and after the 22nd 

 foot) the dorsal division has in front a long tuft of serrated 

 or articulo- serrate bristles and behind is a large dorsal 

 cirrus with blood-vessels. Below^, after an interval, is a 

 smaller cirrus, also with a blood-vessel. The ventral division 

 consists of a setigerous process with a long papilla (ventral 

 cirrus?) and a few very slender bristles of the same type as 

 the dorsal. The peculiarly serrated bristles disappear poste- 

 riorly, long simple tapering bristles taking their places in 

 both divisions of the foot. The majority of the specimens 

 consist only of the anterior region, the posterior having been 

 left in the sand or other ground frequented by them as tlie 

 edge of the dredge severed them. 



Aricia norveyica, Sars, again, was found in Shetland by 

 Dr. Gwyn Jeffreys, and extends to NorAvay and Greenland 

 {Sar's and Norman). The head in this species is typical 

 and the anterior region has fifteen bristled segments. The 



