NOTES ON ECHINODERM MORPHOLOGY. 141 
ne m’étre pas trompé.” To this I can make no further reply 
than that the injection method should not be relied on too im- 
plicitly in the decision of a disputed point of minute anatomy. 
Apart from the divergent results of Perrier and Koehler 
respecting the anatomy of the vascular system in the Urchins, 
there is along series of statements about that of the Star- 
fishes, which are principally based upon the results of injection, 
and are hopelessly at variance with one another. 
_ Besides maintaining the truth of his previous descriptions, 
Koehler discusses some of the points wherein we differ. He 
expresses himself as utterly unable to find the pharyngeal 
blood-vessels which Teuscher described as uniting the oral 
blood-vascular ring (auct) with the radial vessels; and he 
says point-blank that these vessels do not exist,! although their 
presence appeared as theoretically probable to him as it has to 
me. For this reason I may have somewhat overrated the 
value of Teuscher’s observations; but, on the other hand, 
Koehler seems to me to have depreciated them very consider- 
ably when he says: 
J] dit qu’ayant remarqué sur les coupes du pharynx cing lacunes il a pensé 
que ces lacunes correspondaient a cing vaisseaux, que ces cing vaisseaux 
devaient probablement aller se jeter dans un anneau péribuccal et qu’ils 
feraient ainsi communiquer cet anneau avec son vaisseau perinervien. Com- 
ment? il ne le dit pas. Carpenter parle de suppositions dans sa note; on peut 
juger par ce qui précéde la valeur réelle des observations de Teuscher dont il 
défend les conclusions.” 
Teuscher’s description? ofa horizontal section of the pharynx 
(fig. 5) 1s as follows : 
“Zwischen je zweien dieser Ligamente, auf der Mitte jeder Leiste, 
erscheint an jeder derselben eine Gefassdffnung (47.). Nach meiner ueber- 
zeugung gehoren diese Oeffnungen fiinf Blutgefassen an, welche nur aus dem 
Blutgefassring entspringen konnen. Nach unten (fig. 6) sieht man diese 
Gefasse sich von der Wand des Pharynx entfernen, um tber den an der 
Mundbasis liegenden Nervenring (wr.) (wovon unten) hinwegzutreten.” 
Now it does not appear to me likely that Teuscher can have 
1 * Zool. Anzeiger,’ 1885, p. 80. 
2 « Beitrage zur Anatomie der Echinodermen,” iv, ‘ Jenaische Zeitschrift,’ 
Bd. x, pp. 520, 521, Taf. xx, figs. 5, 6. 
