240 BULLETIN OF THE MUSEUM OF COMPAKATIVE ZOOLOGY. 



PLATE VI. 



Callinema ornata, Verb. 



a. Jfortion of the marginal lobe adjoining the marginal cleft in which the otocyst 

 lies. Tlie separation of this lobe from the remainder of the marginal lappet 

 is indicated by a slight depression in the margin or rim of the lappet 



6. Intermediate portion of the marginal lappet between two indentations which 

 separate it from a. 

 Of the two regions of the margin of tne umbreiia, a may oe called the ocular 

 lappet and b the velar lappet. 



ch. Vessel arising from the marginal tube and blindly ending in the ocular 

 lappet. 



cr. Vessels of the same character as the last in the velar lappets. 



cl. Marginal or circular chymiferous tube. 



ga. Oral folds 



0. Otocyst, or marginal sense body. 



p. Tentacle. 



sp. Sexual organs. 



t*. Hood over the marginal sense body. 



Fig. 1. Side view of Callinema, bell contracted. 



Fig. 2. Same, bell more expanded. (The tentacles are cut off in Fig. 2 and more 



or less retracted in Fig. 1. Half of the figure drawn in outline.) 

 Fig. 3. View of the anastomosing and unbranclied radial tubes, seen from above. 



(Tubes drawn in a quadrant of the bell.) 

 Fig. 4. Section of the bell margin, including a velar (h) and an ocular lappet {a). 



This fifjure shows also the relative position of the otocyst, tentacle, and 



blind tubes of the marginal region. 

 Fig. 5. A section of the bell margin of the same specimen from which the last was 



drawn (shown from a different spheromere). 



All figures except Fig. 1, Plate IV., were drawn from nature by the author. 

 The pen and ink sketches of Plate III. Fig. 3, and of Plates IV. and V., were 

 made by Mr. S'. W. Denton. All the others are by the author. 



