86 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



type we have seen in the aggregated Cyclosalpa virgula (pi. 11, fig. 

 28 and pi. 12, fig 29) and Apsteinia punctata (fig. 55, p. 77). 



h.77l. 



1.171. 



-~o.r. 



Fig. 69.— Salpa maxima, aggregated zooid, 

 oeal muscles of the eight side, seen from 

 within. From Strieff (1908). 



Fig. 70.— Salpamaxlma, aggregated zooid, 

 cloacal muscles of the right side, 

 viewed from the inside. from streiff 



(1908). 



The eyes show resemblance to those of Apsteinia punctata (figs. 56, 

 p. 77, and 57, p. 78) and almost exactly resemble those of Salpa fusi- 

 formis except that the large dorsal eye is shorter and more compact 

 in 8. maxima. Figure 79, page 92, a sagittal section of the upper part 

 of the ganglion and the eye of S.fusiformis may be used in connection 

 with this description of S. maxima. In the larger eye there is a group 

 of rod-cells at the base of the eye, whose thin-walled, innervated ends 

 are dorsal, and at the tip of the eye a group whose thin-walled ends 

 are ventral. Intermediate cells are present between rod-cells and 

 pigment cells in each of the two portions of the eye. The pigment 

 cells are as figured. In the dorsal part of the ganglion there is a 

 good-sized group of short rod-cells not associated with pigment. In 

 Apsteinia punctata this group consists, as described, of two hori- 

 zontal layers of rod-cells with their 

 thick-walled ends contiguous. In 

 S. maxima and S. fusiformis the 

 rod-cells in the ganglion form an 

 irregular group and the cells are 

 very irregular in form. Degener- 

 ation has begun, in this ganglionic 

 group of rod-cells. Ajjsteinia 

 punctata has a thickened mass of 



.maxima, aggregated zooid, cross pigment cells in the position in 

 section of the ganglion and neural glands which, in the Cyclosalpas, the optic 



X 145 diameters. From Metcalf (189.1, c). 1 /• i -xt i j.i • 1 



plug is lound. No such thicken- 

 ing of the pigment layer is seen in Salpa maxima . Salpa maxima 

 has departed from the archaic condition more than Apsteinia, since 



,.- e P 



