96 Zoological Society : — 



Distance from anterior molar to incisors much less ; auditory buUse 

 much smaller. Incisors shorter and straighter, and very deeply 

 grooved on the anterior surface. Molars smaller, but otherwise 

 similar in form. Length of skull 1^ inch. 



General differences iromLagomys princeps — First, in being smaller, 

 Hinch shorter in total length; the ear, measured from behind, \ inch 

 shorter : the colour generally darker, especially the lower third of 

 the back. 



Secondly, in the structural differences of the skull ; for although 

 these differences are not prominent or well defined, yet they are un- 

 questionable variations. 



Thirdly, in the habit of constructing a nest of hay for the winter 

 sleep, and in living at a much greater altitude. 



April 21, 1863.— E. W. H. Holdsworth, Esq., F.Z.S., in the Chair. 

 Descriptions of several New^ Species of Worms belong- 

 ing TO THE Annelida errantia and sedentaria or tu- 

 BicoLA OF Milne-Edwards. By W. Baird, M.D., F.L.S. 



The following very interesting species of xlnnelides were collected 

 by Mr. Lord, during the time he was engaged as naturalist on the 

 N.W. American Boundary Commission. They appear to me to be 

 undescribed. They will be figured in the forthcoming report of the 

 labours of the commission. 



1. Lepidonotus insignis, Baird. 



This is a very fine species of the genus Lepidonotus. It is rather 

 more than 3 inches long, and is nearly | an inch in breadth, exclu- 

 sive of the setse of the feet. On the upper surface, the body is of a 

 whitish colour, marbled with black. The sides, which are covered by 

 the elytra, are white, and a broad black line runs down the centre of 

 the dorsum throughout its whole length. The feet are encircled 

 with fine black circular Unes. The elytra, eighteen pairs in number, 

 are oval, white, with black dots on the outer sides and centre, and 

 they are marked with a black semicircular patch on the inner edge. 

 They do not overlap each other, except near the head. On the body 

 of the animal they are wide apart, leaving the centre of the back ex- 

 posed. The under surface is of a bluish-black colour, with a narrow 

 white line running down the centre. The proboscis is large and 

 wrinkled, and the jaws are of a reddish-brown colour. The antennae 

 are five in number, the central one being nearly three times as long 

 as the external pair, and of a pure white colour ; the internal and 

 external pairs white, ringed with black. The feet are very prominent, 

 strong, rounded, conical, and armed with seven or eight stout brown 

 bristles. The second branch is extremely small, and sends off two 

 or three very small white setae. The superior cirrus is tolerably 

 long and sharp-pointed ; it is pedunculated, the peduncle being stout, 

 conical, and of a deep black colour. The inferior cirrus is short, 

 conical, and sharp-pointed. The last segment of the body is termi- 

 nated by two tolerably stout, but not long, cirri. 



Hab. Esquimalt Harbour, Vancouver Island (^Mus. Brit.). 



