NO. 2164. REVISION OF ROTATORIAN GENERA— HARRINC. 543 



long, slender, and slightly decurved; they are about one-third the 

 length of the lorica. They are nearly parallel-sided for one-third of 

 their length and end in very slender points. 



Total length, 138-142 ix; length of lorica 98-105 m, width 70-75 /x; 

 anterior points, 28 m; depth of dorsal sinus, 8-10 /x, oi ventral 

 sinus, 20-22 n; length of foot groove, 26-33 /x, width 32-65 m; 

 length of foot, 22 /x, of terminal joint, 12 m; length of toes, 32 /x; 

 depth of body in median plane, 30 /x; from highest point of dorsal 

 plate to edges of lorica, 36 /x. 



This species has not been found outside of New Zealand; I am 

 indebted to Mr. Rousselet for the material on which this description 

 is based; it was collected by Mr. Murray on the return trip of the 

 Shackleton Antarctic Expedition. 



5. LEPADELLA AMPHITROPIS, new species. 



Plate 93, figs. 9-12. 



The outline of the lorica is ovate, bluntly pointed posteriorly; its 

 width is more than two-thirds of the length. The right and left 

 halves of the dorsal and ventral plates are nearly flat and meet in the 

 median plane at obtuse angles, so that the cross section of the body 

 is rhomboid. On the dorsal plate there is a ridge, beginning a short 

 distance behind the stippled collar and gradually becoming more 

 prominent toward the posterior end of the lorica, where it is raised 

 above the surface as a distinct keel, extending about one-third the 

 length of the lorica. The depth of the body is one-third the length 

 of the dorsal plate. 



The opening for the head is about half the width of the lorica. The 

 dorsal sinus is shallow and semielliptic; its depth is two-thirds of the 

 width. The ventral sinus is roughly V-shaped, rounded posteriorly, 

 and with slightly concave sides; the depth is equal to the width. 

 Both the dorsal and the ventral plate have a stippled collar. 



The foot groove is less than one- third the length of the lorica; it is 

 slightly truncate anteriorly and the sides diverge somewhat toward 

 the posterior end of the lorica, where they curve rapidly inward. In 

 some specimens the foot groove is nearly parallel-sided, but this is 

 rather unusual. The foot is of moderate length and projects shghtly 

 beyond the lorica; the terminal joint is a httle longer than the first 

 and second joints, which are nearly equal. A sensory pit is present 

 on the dorsal side of the posterior foot joint. The toes are one-third 

 the length of the lorica, very slender, and slightly decurved in the 

 posterior half of their length. 



Total length, 104 /x; length of lorica, 76 ju, width, 54 ii; width of 

 anterior points, 22 /x; depth of dorsal sinus, 8 /x, of ventral sinus, 

 22 n; length of foot groove, 21 /x, anterior width, 15 /x, posterior 



