Stiidips nil niiiiiiir f»sll^^(■^ll^ 185 



of this sub-family tluit are described in tliis treatise. The type of these bristles is somewhat 

 different in different species; within each species, on the other hand, they seem to be characterized 

 by rather great constancy. They are most frequently arranged in a transverse row, sometimes, 

 however, as in the genus Gigantocypris, in two closely set and parallel rows. Second masticatory 

 process: In aU the forms of this group that I have examined with the same number of bristles: 

 Five placed in a rather close transverse row on the inner edge of the process and one, usually 

 very short and weak, placed at some distance from the others on the anterior side of the limb. 

 Together with this uniformity with regard to number there is the comparatively slight variation 

 with regard to type that these bristles are subject to within this sub-family. Third masticatory 

 process: This, too, has a quite uniform number of bristles in all the species of this group 

 investigated by me. There are seven bristles arranged in a somewhat irregular, transverse row; 

 these bristles also show within this group a comparatively slight variation with regard to type. 

 The bristles on the two last-mentioned masticatory processes show, with regard to their tvpes, 

 a not inconsiderable mutual parallelism, the types found on the one reappear, with comparatively 

 slight variation, at about the corresponding places on the other. Distally on the anterior side, 

 near the outer edge of the limb, the protopodite generally has an irregular, powerful spine which 

 forms, so to speak, a ventral conclusion of the chitinous skeleton of the epipodial plate (this 

 spine seems never to be present in the sub-genus Cypridina, cf. below); dorsally, too, the chitinous 

 skeleton of the epipodial plate has an irregular swelling (not, however, freely projecting as the 

 ventral spine). The exopodite has four or five joints. The two proximal ones (developed 

 as powerful masticatory organs, see the diagnosis of the family) are of about the same strength 

 and size, the distal one of them not developed into a powerful, tooth-like process. First joint: 

 The main tooth, the most important masticatory organ of this limb, is fixed transversally and 

 somewhat obliquely on the joint and is always very large and powerful. It seems to be subject 

 only to comparatively slight variation within the sub-family. In all the species of this group 

 described in this treatise it is composed of six to eight, usually seven, constituent teeth ; of these the 

 one situated most anteriorly is the longest and most powerful, the rest diminish fairly uniformly 

 in length according as they are situated more posteriorly. The strength of these teeth also 

 diminishes somewhat, even though sometimes only very slightly, according as they are situated 

 more posteriorly. The posterior one of them is short, conical and smooth, the others are bent 

 somewhat backwards and armed along the concave posterior edge with numerous rather powerful 

 teeth, placed close to each other. This joint has also a number of bristles: In all the species 

 of this sub-family that were investigated by me a single bristle was found on the posterior side 

 of the joint, close to the main tooth, and a number of bristles placed in a transverse row on the 

 anterior side of the joint (in most species two of the latter were situated close to the main 

 tooth, one farther out on the limb, a short distance from the former). Second joint: On the 

 inner edge armed with a large number of bristles. Some among these, situated next to the 

 main tooth of the preceding joint, somewhat posteriorly on the joint, are, like the constituent 

 teeth of the main tooth, arranged in a close row, running obliquely and transversally on the 

 joint and are distinguished by their strength; the anterior one of them is rather long, the others 

 decrease fairly uniformly in length according as they are situated more posteriorly; they are 



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