311 



first maxilla is hiramous; iht- ciulniJixliti- is ihr smalkT (if the two parts. The maxil- 

 liped is larger than the maxilla, and is jointed and irini;ed with hairs. The epipodite 

 is triangular in shape and bears very fine hairs. The inner lobe of the eiidopodite has 

 a very small palpus ending in a claw. When in place the maxillipeds oxerlie the maxillae 

 at the tips, hut not at the bases. 



To summarize, we find that the mandibles are large, denticulated organs designed 

 for cutting into the wood and crushing it. The remaining mouth parts are so con- 

 structed as to be of service in carrying the wood ])articles into the mouth, alter their 

 preparation by the mandibles. 



— ^ — ^-_-* 



Fig. 12(). Limmnia liiiiiorum, ventral view of head ol male: 



a. First antenna. e. Mandible. 



b. Second antenna. /. First maxilla. 



c. Metepistomiini. g. Second maxilla. 



d. Labrum. /;. Maxilliped. 



X 56. .\lter Hoek, 1893. 



The several species of Linuioria do not differ greatly in external form. The char- 

 acters used in determining them are as follows: the relative length of the epipodite of 

 the maxilliped and its basal joint; shape of the outer ramus of the uropod and its 

 size in relation to the inner ramus; the maxillary palps, diarticulate or triarticulate; 

 the shape of the telson and the number of tubercles and ridges upon it; the size and 

 contour of the body and its color; and habitat of the organism — wood or kelp. In L. 

 U«norum the epipodite of the maxillipeds is shorter than the basal joint. The outer 

 ramus of the uropod is shorter than the inner, and is claw-like in appearance. There 

 seems to be some variation in regard to the number of tubercles and ridges on the 

 telson. Bate and Westwood (1868) figure a median dorsal carina on the telson, while 

 Sars (1897) does not. Some variation in these characters has been observed in the San 

 Francisco Ba\' specimens. The characters of the organism occurring in San Francisco 



