32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



strong mandibles and the thoracic Hmbs. In figure i, plate 22, their 

 exopodites are shown on the left side, and on the right side the endop- 

 odites of the maxilla with the exopodite of the maxillula, the endop- 

 odite of the latter having apparently been pushed under and a little 

 forward of the mandible. Sometimes the endopodite is present but 

 the joints are indistinguishable or only a few can be seen. 



Thoracic limbs. — The biramous thoracic limbs appear to be uniform 

 in character from the cephalon to the minute plate-like telson at the 

 posterior end of the body. Each limb is formed of a protopodite, a 

 jointed endopodite, and a jointed fringed exopodite. 



Protopodite.^ — The large protopodite is attached by its inner end 

 to the lower side of the body segment about half way between the 



Fig. 10. — Diagrammatic outline of the posterior side of one of the anterior 

 thoracic limbs : pr. protopodite ; en, endopodite ; ex, exopodite ; /, filaments of 

 exopodite : /, intestine. 



This figure indicates the point of attachment of the limb to the body, also 

 approximate position of the intestine. 



ventral median line and the rounded outer side of the body apparently 

 in the same manner as the trunk limbs of Apns, except that in the 

 latter there is no evidence that the protopodite served as a gnathobase. 

 The protopodite is elongate, apparently cylindrical at its inner end. 

 and flattened somewhat at the distal end ; it is strong, and supports an 

 endopodite and an exopodite. It is usually flattened so as to appear 

 of about the same width throughout its length ; a few specimens in- 

 dicate that it narrowed at its proximal end, essentially as shown in the 

 restoration. 



Endopodites. — The endopodite or leg is formed of six joints. The 

 first five joints of the anterior limbs are rather flat and broad at the 



^ I find that at many places Doctor Walcott changed " protopodite " to 

 " coxopodite." Whether this term was supposed to have been changed here also 

 I was unable to ascertain. — C. E. Resser. 



