you 2, pt. 2.] A TAXONOMIC STUDY OP THE SALPIDAB METCALF. 4 7 



mediate muscle on each side of the body. The band of muscle, which, 

 in the aggregated Cyclosalpae symmetricales, connects the dorsal por- 

 tions of the last sphincter of the upper lip with the intermediate 

 muscle, does not, in the aggregated C. virgula, make actual connec- 

 tion with the last oral sphincter on either side. This is also true of 

 the other asymmetrical species, C. bakeri. 



The gut resembles that of the aggregated Cyclosalpa bakeri, 

 though its caecum is directed forward on the right side of the body 

 (fig. 30, pi. 12) instead of protruding into a separate evagination 

 of the mantle as in C. bakeri. This caecum arises from the 

 left side of the intestine (fig. 28, pi. 11), but bends over to the 

 right side of the enlarged base of the post-abdomen. It is really the 

 morphological left caecum. There are a few loosely arranged degen- 

 erate ( ?) cells at the tip of the 



caecum, corresponding to the ^j$s#&j^7'i$i%i'%s 



fusiform mass of such cells one ^f^^WS^Hr^ / 



finds in C. bakeri. There is a ? b ^€?&M*Mr — ° 

 slightly developed right caecum. "®*— ^ — -.ph. ep. 



The position of the intestine in % ~^-^^^^^r^- 



our figure 30, plate 12, a ven- <a^ 



tral view, is a little distorted 



i i:_t»j. j. i.- At, l Fig. 18.— Cyclosalpa virgula, aggregated form, 



by slight rotation, the large AN 0BLIQUE L0NGITUDINAL SECTI0N THR0UGH THE 

 caecum being pulled a little to neural gland and the outgrowths from the 



+1^ ~;„1,j- „* . +~ ^11^„ T ~ *.~ ganglion. From Metcalf and Johnson (1905). 



the right, so as to allow one to 



see the smaller, morphologically right caecum, which in ventral view 

 is hidden by the base of the large caecum. The dorsal view (fig. 33, 

 pi. 13) shows the true positions. The intestinal gland is seen from 

 figures 28 and 29, plates 11 and 12, and figure 33, plate 13, to have 

 the usual arrangement. 



The testis lies in the distal portion of the great post-abdomen. Its 

 duct has the usual course and opens into the atrial chamber, not far 

 from the anus. The ovary is on the right side, in the usual position, 

 between body muscles III and IV. 



The outline of the aperture of the dorsal tubercle is shown in fig- 

 ure 32, plate 13. 



The ganglion (fig. 31, pi. 13) shows no features of moment for our 

 studies except the eyes and the outgrowths toward the neural glands. 

 These glands are of the usual disk form with convoluted ducts leading 

 from them (fig. 18, this page). There is a protuberance from the 

 ganglion toward each glandular disk, the base of each protuberance 

 containing small cells like the small cells of the ganglion, the distal 

 portion of each protuberance containing a mass of larger cells, this 

 group of cells being separated from the smaller cells by a distinct 

 membrane. 



2621— Bull. 100. vol. 2—19 1 



