APPENDAGES. 167 



gated : on the inner surface of its distal end 

 is an oval cushion covered with short curved 

 stiff setae, and notched to receive the point of 

 the lacinia. 

 iii. The exopodite or maxillary palp is a five- jointed 

 palp, borne on the outer side of the distal end 

 of the stipes. Its first two segments are short. 



d. The second maxillse are similar in shape to the first 

 maxillae, but smaller. They are fused together 

 in the median plane by their protopodites,- and 

 together constitute the labium or posterior lip. 

 i. The two protopodites are fused in the median 

 plane to form a two- jointed plate. The sub- 

 mentum or proximal segment is the larger of 

 the two, and is very broad from side to side. 

 The distal segment, or mentum, is smaller, and 

 bears the endopodites and exopodites. 

 ii. The endopodites are together sometimes called 

 the ligula. Each is divided into an outer 

 division, the paraglossa, corresponding to the 

 galea of the first maxilla ; and an inner divi- 

 sion, corresponding to the lacinia. 

 iii. The exopodites are three-jointed palps corre- 

 sponding in form and position to those of the 

 first maxillffi. The stump supporting each is 

 called the palpiger. 



2. The thoracic appendages are three pairs of legs, borne 

 by the sterna of the thoracic segments. They are 

 very similar to one another, but the hindmost are 

 rather the largest. Each leg consists of the following 

 parts. 



a. The coxa is the stout flat proximal piece of each leg. 



b. The trochanter is a very small piece attached to the 



distal end of the coxa. 



0. The femur resembles the coxa in form, but is more 

 slender. 



