212 



stinctly different from the short and thick granules in the tentacle- 

 stem (Fig. 29. 6). 



Leptosynapta tenuis (Ayres) was hitherto regarded as synonymous 

 with inhaerens (O. F. Müller), and the specimens from Woods Hole 

 regarded as typical American examples of this species. The com- 

 parison of the American specimens with good specimens from Bergen, 

 shows that the American specimens are specifically different from 

 inhaerens. In order to put it quite clear, it may be practical to 

 give the differing characters in tabular form. 



tenuis from Woods Hole 



Skin rather thick, intransparent. All 

 papillae white. 



Number of digits 9 — 11. 



Number of sensory cups 15 — 25. 



Genital porus on a low wart, close 

 behind the tentacles. 



Ciliated funnels of two distinctly dif- 

 ferent sorts (Fig. 28. 1). The large 

 ones labiate. 



The anchors and anchor-plates from 

 the posterior end of the specimens 

 of another size and shape than 

 those from the anterior end (Fig. 

 28. 3—12). 



Shape of calcareous ring cf. Fig. 28. 2. 



Digital rods small and irregularly 

 shaped (Fig. 29. 4). Their ends faintly 

 enlarged and more or less branched. 



inhaerens from Bergen 



Skin thin and translucent. Anterior 

 part of dorsal papillae mud-grey, 

 the others white. 



Number of digits 13 — 17. 



Number of censory cups 2 — 8. 



Genital porus on a very long papilla 

 which is, for the two thirds of its 

 length, united with the oral side of 

 one of the dorsal tentacles. 



Ciliated funnels of varying size, but 

 not of two distinctly different sorts. 

 The large ones being fan-shaped 

 (Fig. 28. 15). 



The anchors and anchor-plates from 

 the two ends of the specimens not 

 distinctly different. Their shape is 

 typically different from that of the 

 anchors and plates in tenuis (Fig. 

 28. 13-14). 



Shape of calcareous ring cf. Fig. 28. 16. 



Digital rods large, slightly curved and 

 with much enlarged and branched 

 ends (Fig. 29. 1). 



From the other East American species of Leptosynapta, the species 

 tenuis is more or less distinctly different, but the real relation between 

 these species cannot be made out until larger collections from 

 Florida, Jamaica and Tobago will be available. 



