268 SCALPELLUM PERONII, 



in 8. vulgare ; but, as I shall hereafter have to give all 

 the measurements, I do not think them worth repeating 

 here. In the one large group of specimens examined by 

 me, in Mr. Cuming's possession, all were attached sym- 

 metrically to the coralline, as in the case of 8. vulgare, 

 capitulum upwards, and their carinas outwards. 



Length of capitulum about three quarters of an inch ; 

 width about half an inch ; entire length, with peduncle, a 

 little more than one inch. 



The Mouth is placed far from the adductor muscle. 



Labrum, with its basal margin much produced ; upper 

 part highly bullate, forming a rounded projection equalling 

 the longitudinal axis of the rest of the mouth; crest 

 without any teeth. 



Palpi, triangular, with the two margins, thickly clothed 

 with bristles ; on each side of the mouth, near where 

 the palpi are united to the mandibles, there is a slight, 

 orbicular, shield-like swelling. 



The Mandibles (PL X, fig. 3) have nine or ten very 

 unequal teeth, with the inferior angle rather broad and 

 pectinated; of these, there are four main teeth, of which 

 the second is always the smallest, and between the four, 

 one or two small teeth are interpolated ; so that the total 

 number is either nine or ten, and often varies on the two 

 sides of the same individual, as likewise does the shape 

 of the inferior angle. 



Maccillce, with the edge nearly half as long as that of 

 the mandibles, supporting from seventeen to twenty pairs 

 of spines ; the upper pair is only slightly larger than 

 the others ; a part near the inferior angle projects slightly 

 beyond the rest of the nearly straight edge. The 

 apodeme, at its base or point of origin, is unusually 

 broad and flat. 



Outer Maxilla, large and triangular. The inner margin 

 is slightly concave, and continuously covered with short 

 spines. The outer margin is bilobed, as in 8. vulgare, 

 with the basal part supporting a great tuft of long bristles, 

 of which the greater number turn outwards, and almost 



