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ANNUAL REPORT SMITHSONIAN INSTITUTION, 19 31 



nomenclature. The shaft of the limb beyond the basis constitutes 

 the telopodite. 



The most important feature of the first maxilliped of Anaspides, 

 for our present purpose, is the presence of lobes borne on its basal 

 parts. Viewed from the side (fig. 17 A) it is seen that the basis 

 carries two long exite lobes {lEx, 2Ex), and that a third exite 

 {3 Ex) arises from the proximal end of the first trochanter. Turn- 

 ing the limb outward (B), it is to be observed, furthermore, that 

 the basis is provided also with two mosal lobes, or endites. The 

 first endite we may call the lacinia (Lc), and the second the galea 

 (Ga), since these are familiar entomological names for similar 

 lobes of the maxillae. Considering, now, that there are two exite 

 lobes and two endite lobes on the maxilliped basis, it might be argued 

 that the apparent single basal segment of the appendage is really 

 formed by the union of two more primitive segments, each provided 



Figure 17. — First maxilliped of Anaspides tasmaniae 



A, outer view of left appendage. B, anterior view of base of same. Ex, exite 



lobes ; Oa, galea ; Lc, lacinia. Other lettering as on Figure 15. 



with an exite and an endite. If this is really the case, the basis, or 

 coxopodite, of the maxilliped is composed of a coxa and a subcoxa, 

 which have become united. There are certain other theoretical rea- 

 sons for believing that the basis is a compound segment, but the 

 visible facts do not in themselves give support to the idea, and the 

 writer prefers to take the facts at their face value. The basis, there- 

 fore, is here assumed to be a single segment bearing two exite lobes 

 and two endite lobes. 



The two pairs of appendages that precede the maxillipeds are the 

 first and the second maxillae. The maxillae are small, flat append- 

 ages (fig. 18 C, D, E) having no suggestion of the leglike form of 

 the maxillipeds, but on close inspection it is to be seen that each 

 differs from a maxilliped simply in the reduction of the telopodite 

 (Tlpd) and in an elaboration of the basis. In other words, each 

 maxilla is mostly the basis of an appendage, bearing the two endite 

 lobes {Lc, Ga) but having no exites, and supporting a rudimentary 



