106 chiropsalmus buitendijki. 



Reference letters. 



eu = exumbrella. ro = reproductive organ. 



ff == frenulum. sn = sensory niche. 



go = gastric ostium. sp = stomach-pocket. 



ma = manubrium. st = stomach. 



pa = pocket-arm. su = subumbrella. 



pe = pedalium. vc = velar canal. 



pk = phacellus. ve = velarium, 

 rh = rhopalium. 



EXPLANATION OF THE PLATE. 



Fig. 1. Chiropsalmus Buitendijki, from one of the per- 

 radial sides; X ^/^ diam. 



Fig. 2. The same cut in halves vertically through a 

 perradius; nat. size. 



Fig. 3. A sensory niche with the rhopalium; >( 4 diam. 



Fig. 4. A pedalium ; nat. size. 



Fig. 5. A rhopalium or sensory club; magnified. 



Fig. 6. Surface-view of a velarium-quadrant to show the 

 shape of velar canals; X '^/s diam. 



Leyden, May 1907. 



Notes from the Leyden Museum, Vol. XXIX. 



