A. H. CLARK : THE CEINOIDS OF THE INDIAN OCEAN. 



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fifteenth and sixteenth brachials (the second sometimes omitted), and distally at 

 intervals of from seven to ten oblique muscular articulations. 



Pd 4'5 mm. long, moderately atout basally, but tapering rapidly in the proxi- 

 mal half and slender distally, with twenty segments, at first about twice as 

 broad as long, becoming squarish after the eighth ; the second to the seventh seg- 

 ments are rather strongly carinate; P^ similar, very slightly longer and stouter; 



Pig. II. — Heterometra singularis. 

 Lateral view of the type. 



Pji 6 mm. long, considerably stouter and stiffer than the preceding and rather 

 more strongly carinate basally, with about twenty segments, the first seven 

 (except for the carinate process) squarish, the remainder slightly longer than 

 broad becoming about half again as long as broad distally ; the ridge in the dis- 

 tal half of the outer side is but little marked ; P, 3 mm. long, much smaller than 

 any of the preceding, with about twelve segments, at first broad, becoming 

 squarish about the fifth, and nearly twice as long as broad distally ; the second- 



