482 



anzunehmen, daß die 2 Vipern ans der Nähe von Riaz, nordöstlich von 

 Bulle, welche Dr. Clerc der ärztlichen Gesellschaft in Bulle demon- 

 strierte, der Species Aspis angehörten (Bullet, de la Soc. méd. de la 

 Suisse romande, Sept. 1869). 



Diese Notiz ist das einzige, was wir bis jetzt in Beziehung auf die 

 Reptilienfauna dieses großen Kantons wissen. Vermutlich findet sich 

 Aspis, vielleicht auch Bertis noch an manchen Lokalitäten der Frei- 

 burger Berge, und es dürfte sich mit der Zeit eine Ergänzung des roten 

 Strichs der Karte etwa von Vivis durch das Greyerzerland gegen das 

 Simmental hin ergeben. « 



Auf dieser Angabe, die um so nichtssagender ist, als man in hie- 

 siger Gegend auch die Kreuzotter als vipère bezeichnet, beruht also 

 jene irrige faunistische Angabe. 



2. The Classification of the Styelidae. 



By A. G. Huntsman, Biological Department, University of Toronto. 

 (With 13 Figures.) 



eingeg. 7. Januar 1913. 



Recently I have had occasion to consider rather carefully the 

 basis of classification in the family of the Styelidae. This has led to the 

 investigation of the limited amount of material belonging to this family 

 that has been at my disposal. As there is slight prospect of my conti- 

 nuing this study, I have thought it best to publish the results obtained 

 thus far. Of certain species I have been able to study a large number 

 of specimens which had been well preserved. This has been of distinct 

 advantage. 



Styelid Characters. 



There are a number of characters that are of use in distinguishing 

 Styelids from members of the other Ptychobranchiate families. 



They are distinguished from Caesirids (Molgulids) by their straight 

 stigmata, by the absence of a renal organ and by the four-lobed (or 

 slit-like) oral aperture; from Caesirids and Tethyids (Cynthiids) by the 

 definite stomach, by the absence of a liver and by the simple tentacles 

 (except in Pyuropsis Mchlsn. 1911). From the Botryllids they differ 

 only in never forming (when colonial) systems of individuals with a 

 common cloaca. The zooids are so remarkably similar in Styelids and 

 Botryllids that it is doubtful whether the presence or absence of systems 

 is of enough importance to warrant their separation into distinct fa- 

 milies. 



Of the characters so far considered, none are peculiar to Styelids. 

 Pyloric Caecum. I think it quite probable that the peculiar out- 



