66 



MR. L. A. BORRADAILE ON THE 



separated by a very distinct notch. The notch in the proximal 

 endite, though less distinct, can often be made out. The endo- 

 podite is simple with a stout bristle near the top, and often 

 indications of a joint a little further down. At the tip of the 

 exopodite a few small joints may be present and at its base on 

 the outer side is a fringed lobe (lobe a of Boas) which varies in 

 Avidth with the body and has perhaps some function in regard to 

 the current which the scaphognathite sets up in the gill-chamber. 

 Its bristles are feathered like those of the scaphognathite. The 

 epipodite varies much in size, and its outer border is usually 

 notched. 



6. In the second maxilliped (text-fig. 49), the main axis 

 consists of six joints, the basipodite and ischiopodite being fused. 



Text-figure 49. 



COX 



Second maxilliped of Leander serratus. 

 For lettering see p. 71. 



The last two joints are bent strongly backwards on the inner 

 side of the limb, so as to lie parallel with the ischiopodite, and, 

 owing to the backward (morphologically forward) growth of a 

 process of the propodite on the outer (morphologically inner) side 

 of the dactylopodite, the latter comes to lie along the median side 

 of the former, instead of at its apex. Thus these two joints are 

 compacted into a firm plate, which presents a long median 

 margin, fringed with bristles, against its fellow of the opposite 

 side. This is, of course, the typical caridean condition of the 

 limb. The exopodite is obscurely annulate in the greater part of 

 its length, and bears at the end a comparatively small number 

 of true joints. The coxopodite carries on the outer side a simple 

 epipodite (mastigobranch), at the base of which may be a gill 

 (Leander, Urocarklella) or the vestige of one. On the median side 



