78 



CTENOPHORA. 



local(?) variety of Bolina infundibnluDi , (which is not recorded from tlie Mediterranean), these three 

 forms being almost invariably found together. 



A detailed account of the anatomy of this species is given by Vogt & Yung (Op. cit). I have 

 found it, upon the whole, very careful and exact; some few remarks should, however, be made to it. 

 In the figs. 71 — 72 (p. 172) the long (subventral costse) are shown to continue to about the middle of 

 the lobes, and from there to the lower end they are represented as being set with rather coarse hairs, 

 somewhat similar to those of the auricles. These hairs I have never been able to observe, and I 

 think I can maintain that they do not exist, in any case in the younger specimens. Likewise I have 

 never seen the costse proceed so far down on the lobes. Seeing, however, that the specimen figured by 

 Vogt & Yung niu.st have had a height of ca. 15""', while the largest specimens observed by me were 

 only ca. 5"" high, I do not venture to maintain that it cannot be in these large specimens as repre- 

 sented in the figures quoted. The large folds at the base of the closed lobes represented in these 

 figures I have not observed either. 



In the description of the gastrovascular system we find the remarkable statement, that the 

 subtentacular vessels bend downwards at their upper end continuing into the excretory vessels; thus 

 a closed circle is made here, as shown by the fig. 85, p. 193. Such a connection between the excretorj' 

 and the subtentacular meridional vessels being otherwise unknown in Ctenophores, I was beforehand 

 inclined to think that this was a misrepresentation. However, I am not able to disprove this state- 

 ment, on the contrary, my observations would seem to support the statement of Vogt & Yung. In 

 the young specimens I found that the subtentacular vessel has a little adapical prolongation above 



the place, where the adradial vessel joins it In 

 the largest specimens observed (ca. 5'="' high) this 

 prolongation had increased very considerably, as 

 shown in fig. 15. Considering the much larger size 

 of the specimens studied by Vogt & Yung, it 

 seems quite possible that in such large specimens 

 the prolongation of the subtentacular meridional 

 vessels has increased so much as to join the excre- 

 tory vessel. — Also L. Agassiz (Op. cit. p. 364) 

 appears to have observed such a connection of the 

 vessels ( — he believes that all eight meridional 

 vessels are in connection with the "ring"-vessel 

 below the the apical organ — ). — It may be remarked 

 that I did not observe any cilia along the adapical 

 continuation of these vessels, such as are shown 

 in the quoted figure of Vogt & Yi:ug. 



Regarding the windings of the subventral 

 vessels in the lobes Vogt & Yung state to have 

 failed to see "die reizenden Arabesken, in welche 

 jene Liuien, die nur durch das Vorhandensein des 



^ 



Fig. 15. Aboral portion of Bolina infiindibnhim (Fabr.) from 

 the transversal plane, a. p. apical prolongation of the sub- 

 transversal meridional vessel; c. p. ciliated pouch of phar- 

 ynx; c. r. ciliated ridge ("nerve"); excr. v. excretory vessel; 

 inf. infundibuluni; inf. c. infundibular canal; ir. v. interradial 

 vessel; o. opening of the oesophagus into the infundibuluni; 

 ph. f. pharyngeal (stomodseal) folds; p. f. polar field; 

 t. V. tentacle vessel. 



