34 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The stolon in our specimens is curled to the right, differing from 

 the straight ventral stolon of other Cyclosalpas. Our specimens do 

 not show more than the beginnings of whorls. The position of the 

 heart is indicated by a slight evagination in front of the intestinal 

 caeca. 



The form of the aperture of the dorsal tubercle is shown in figure 16. 

 It is much simpler than in other solitary Cyclosalpas except the nearly 

 related C. bdkeri. 



The horseshoe-shaped eye, the neural glands, and the outgrowths 

 from the ganglion in connection with the neural glands agree so 

 closely with the corresponding organs in the solitary Cyclosalpa pin- 

 nata and C. ajfinis as to need no description. 



CYCLOSALPA FLORIDANA, aggregated form. 



Plate 5, fig. 15; and plate 6. 



Our figures and descriptions are based on the study of ten individ- 

 uals from 6 to 9 mm. in length, collected in May and June, 1907, near 

 Nassau, Bahama Islands. These are the specimens used by Brooks 

 (1908) in the preparation of his paper upon this species. Some of 

 Brooks' specimens have been deposited in this museum (U.S.N.M., 

 Cat. No. 6676). We have also a poorly preserved specimen from the 

 Gulf of Mexico, off Mobile Bay, United States National Museum, Cat. 

 No. 6453 (aggregated form), Albatross station D 2402; off Cape San 

 Bias, Gulf of Mexico; March 14, 1885; 111 fathoms; surface temper- 

 ature 63° F.; one specimen. 



The general form of the body is very different from that of the 

 aggregated Cyclosalpa pinnata and C. ajfinis, being roughly triangular 

 in side view, and the very noticeable postabdomen emphasizes the 

 distinct appearance. In details of structure, however, the resem- 

 blance to the other Cyclosalpas is seen. The test is enlarged even more 

 than in C. ajfinis. Luminous organs are entirely lacking. 



Study of the body muscles shows but three. The intermediate 

 muscle and the first body muscle are essentially similar to those of 

 the aggregated O. ajfinis. The second body muscle of C. ajfinis and 

 C. pinnata seems to be the one missing in C. jloridana. It may be 

 altogether lacking, but study of the aggregated C. bakeri suggests that 

 its fibers may be fused with one of the other body muscles. The 

 second and third body muscles of O. jloridana, corresponding probably 

 to the third and fourth of C. ajfinis and C. pinnata, are united in the 

 manner shown in the figure. Noting a few details: observe that the 

 intermediate body muscle passes outside the oral retractor, that ven- 

 trally it unites with its fellow of the opposite side, and that the com- 

 mon strand thus formed is continued back into the very slender 



