Gaily Marine Laboratory, St. Andrews. 1G1 



inches. 



Length of nose from tip to nasal opening. . . . 22| 

 Width at base of nose at contraction in front 



of maxillary knobs 11 



Length of scapula from glenoid cavity to 



upper opposite edge 13| 



Acromion (subquadr angular), length 4 



ii ,, „ width 4 



Coracoid process 3$ 



Os humeri (tuberculum majus large) 8| 



Radius, length 8 



„ width, lower end 5J 



Ulna, length 8£ 



,, across olecranon, width 4^ 



,, at lower end, width , . . . . 5^ 



2. On the British Ammocharidse. 



The family of the Ammocharidce forms a comparatively 

 recent introduction into zoological literature, and yet its 

 representatives, though few, are world-wide in their distri- 

 bution. No mention is made of any species in Dr. Johnston's 

 1 Catalogue of the Annelids in the British Museum/ though 

 in 1842 Delle Chiaje had described and figured Owenia 

 fusiformis, the common form on the British shores, and 

 often tossed in hundreds on the West Sands of St. Andrews 

 after storms. 



The cephalic region of Owenia fusiformis varies a little 

 in appearance when viewed antero-posteriorly in spirit- 

 preparations ; but in general it presents a truncated surface, 

 having dorsally a rounded elevation the long diameter of 

 which is transverse. Arnold Watson describes an aperture 

 through a network of muscular fibres at the convex median 

 part of this anterior lip, establishing communication be- 

 tween the coelom and the exterior. Beneath this laterally 

 are two lobes or lips, sometimes marked by an oblique 

 groove slanting from above downward and inward, and 

 having the mouth at their anterior border. A bilobed pro- 

 cess (the "Lippen-organ" of Drasche) projects from the region 

 behind, whilst interiorly another rounded process occupies 

 the furrow, which is finally bounded ventrally by the smooth 

 border of the rim between the branchial processes. This 

 edge of the cephalic rim slightly recedes in comparison with 

 the dorsal, so that the surface does not form quite a right 

 angle. In lateral view, indeed, the median ventral edge is 

 spout-shaped, though it does not project much. An eye-spot 



