CAMBALOID MILLIPEDS LOOMIS 55 



of the first segment across the anterior corners. Segments 2 and 3 

 nearly flat longitudinally, without a transverse constriction; lateral 

 striae reaching to the edge of the dorsum on segment 3. Segment 4 

 with a transverse constriction, the posterior subsegment moderately 

 convex and with ridges arranged as on the ensuing segments but 

 fainter. 



From segment 5 to the caudal end of the body the anterior sub- 

 eegments are as in Pharodere^ with anterior portion coarsely reticu- 

 late, the posterior part longitudinally channeled, each channel con- 

 taining a rounded pit behind. Posterior subsegments abruptly 

 raised from the transverse constriction, the dorsum a little convex, 

 Avith ridges disposed as in Pharodere but less definite in shape; a 

 large ridge on each side of the middle, the pair widely separated; 

 between each large ridge and the lateral carina are two or three 

 smaller, lower ridges; all ridges arising from the front of the sub- 

 segment but not reaching the posterior margin on any but the hind- 

 most segments; posterior margin flat and lower than the surface 

 between the ridges. On several segments immediately preceding the 

 penultimate segment the large median crests increase in size and 

 project beyond the hind margin, the other ridges becoming less evi- 

 dent and not projecting. Pores beginning on segment 5, borne in a 

 very small and shallow depression in the broad margin of the lateral 

 carinae. Lateral carinae of less definite shape than in Pharodere^ 

 especially on the anterior segments, where they are little more than 

 rounded swellings ; on the posterior segments they are more flattened 

 than on segments farther forward, but each is strongly produced 

 beyond the hind margin as a triangular tooth. Below the lateral 

 carinae numerous prominent striae reach to the feet. Penultimate 

 segment very short and without ridges or lateral carinae. 



Last segment long; dorsum nearly flat longitudinally; the thick- 

 ened apex angularly rounded, a little projecting beyond the valves 

 and with two setae. 



Anal valves inflated and meeting in a rather broad, deep groove; 

 each valve with two setae near the opening. Preanal scale very 

 short; the hind margin straight across, the front margin broadly 

 rounded; processes small, each with a short seta. 



ODACHURUS PETASATUS. new species 

 FiGTXBE 17 



A single mature female specimen collected with specimens of 

 Pharodere and Leiodere beneath stones on the cliffs above the sea 



