592 



ALEXANDER MEEK 



larva is got at Heligoland, and at St. Andrews rrofessor 

 Mcintosh says it is obtained fairly regularly in August and 

 September. In the Channel another kind of larva is also 

 procured, Torn aria krohnii. Tornaria krohnii is 

 distinguished by a more conical shape anteriorly, by the 

 longitudinal ciliated bands being thrown into folds, and by 

 the stomach and intestine being narrow comparatively. 

 This larva is common in the Mediterranean, and it is common 

 inshore at Plymouth. Dr. Lebour was good enough to send 



Text- FIG. 14. 



Tornaria captured at St. Andrews, August 6, 1800, which it is 

 suggested may be the larva of Glossobalanus. 



me examples from the Plymouth plankton and they all are 

 Tornaria krohnii, and Bourne had already stated that 

 the inshore larvae were Tornaria krohnii. Since 

 Heider (1909) obtained so fortunately early stages of 

 Balanoglossus clavigerus which he found to agree 

 with early stages of Tornaria krohnii, Stiasny (1913) 

 has been able to follow the history in greater detail, and 

 there appears to be little doubt that Tornaria krohnii 

 is the larva of Balanoglossus clavigerus. This 

 species is common on the south side of the Channel and 

 on the north-west coast of France. 



At the west end of the Channel it appears then that there 



