'36 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



of the dorsal tubercle is shown in figure 16, plate 5. The ganglion 

 and glands are as in Cyclosalpa pinnata and C. affinis. There are 

 paired outgrowths from the ganglion toward the disks of the neural 

 gland, as in other Cyclosalpas. 



The large dorsal eye (fig. 16, this page) is much as in Cyclosalpa affinis, 

 except that it is a little more compact. The transverse plug of optic 

 cells {e."') behind and above the apical portion of the eye, is less dis- 

 tinct, being crowded against and into closer union with the rest of the 

 eye, one common pigment layer serving the rod-cells of both the optic 

 plug and the apical division of the eye. 



Cyclosalpa jloridana has been studied by Apstein (1894, b, not 1906, 

 b), Brooks (1908), and Ihle (1910). Our studies result in considerable 

 disagreement with the first two of these authors. Apstein's figures 



Fig. 16.— Cyclosalpa floridana, aggregated form, a sagittal section of the gan- 

 glion AN! DORSAL EYE. X 300 DIAMETERS. 



lack details of the organs other than the muscles. The whole oral 

 muscular system of the solitary forms he describes very differently, 

 showing no dorsal oral retractor, two instead of three ventral lip 

 sphincters, and different connections for all the oral sphincters. He 

 does not show the atrial retractor. There is so little detail in his 

 figures of the aggregated form that comparison with our results is 

 difficult. No muscles are shown upon the ventral lip. He figures no 

 connection between the third sphincter of the upper lip and the inter- 

 mediate muscle. He shows but one muscle, the intermediate, con- 

 tinued into the peduncle. He unites the ventral ends of the first and 

 second body muscles. He shows no branches from the third body 

 muscle into the post-abdomen. He figures but one atrial sphincter. 

 Brooks, who studied the same specimens we used, gives a much 

 fuller description than Apstein. In the solitary form we find one 

 dorsal sphincter and two ventral sphincters in addition to those 

 which he shows in the oral region of his adult specimens, but in his 

 figure of a large embryo 4.5 mm. long he shows six instead of our four 



