671 



derms, made by the Fish Commission's steamer 'Albatross', off the 

 eastern coast of Japan in the spring of 1900, has been placed in my 

 hands for identification and study. In examining the Crinoids, a 

 number of Myzostomes, both free and encysted were found. Some 

 months later while looking over a very large ophiuran of the genus 

 Ophiocreas (or allied thereto), I was surprised to find on the oral side 

 of the arm, what seemed to be a Myzostome, and further search was 

 rewarded by the discovery of several more specimens. Later I discovered 

 a number of these free living forms on specimens oi Astroceras perga- 

 mena Lyman from other stations, but all the ophiurans upon which 

 the parasites were found were from depths of considerably more than 

 100 fathoms. All of the Myzostomes were sent to Professor William 

 M. Wheeler of the University of Texas, who assures me that, so far 

 as he can recall , Myzostomes have not been reported from any hosts 

 except Crinoids. A hasty examination shows nothing especially peculiar 

 in the specimens taken from ophiurans, all of which seem to be very 

 much alike. But the existence of a new host for these parasitic worms 

 seems worthy of record. It ought to be added perhaps, that the position 

 of the worms upon the concave under side of the arms, or on the sides 

 of the arms close to the disc, made it clear that they had not become 

 accidentally attached to the ophiurans, since the latter were dredged. 

 As crinoids and ophiurans were not in the same jars, the possibility of 

 the introduction of Myzostomes from one to the other was reduced to 

 a minimum. 



4. Brookeia Baileyi E. Bartlett und Adelochelys crassa Baur. 



Von Gustos F. Siebenrock, Wien. 



eingeg. 27. Juli 1902. 



Während meines Aufenthaltes in München, Ende Mai d. J., hatte 

 ich unter Anderem auch Gelegenheit in der Studiensammlung des 

 zoologischen Instituts jenen Schildkrötenschädel zu besichtigen, den 

 Baur 1 zum Typus einer neuen Gattung erhob und unter dem Namen 

 Adelochelys crassa in die Wissenschaft einführte, Baur verglich ihn 

 mit den Schädeln der amerikanischen Gattungen Dermatemydidae^ 

 Cinosternidae u. Chelydridae, mit denen er mehr oder weniger Ähn- 

 lichkeit haben soll. Aus diesem Grunde schloß der genannte Autor, 

 daß der fragliche Schädel, der von unbekannter Provenienz war, von 

 einer Schildkröte aus Centralamerika stammen müsse. 



1 Baur, G., Der Schädel einer neuen großen Schildkröte [Adelochelys) aus 

 dem zoologischen Museum in München. Anatom. Anz. Bd. XII, 1896. p, 314. 



