3/4 CHAS. W. HARGITT. 



A comparison of the characteristic specimens of C. johnstom 

 taken at Harpswell with the Woods Hole and Naples specimens 

 has led me to consider both as entitled to specific distinctness, and 

 I am therefore designating the local species as C. vohibilis, and 

 believe the Naples specimens to be the same. The following 

 features are diagnostic : 



Stems usually simple and unbranched, 2-4 mm. high, annu- 

 lated at proximal and distal ends, occasionally indefinitely annu- 

 lated throughout. Hydranths relatively large, with 2024 stout 

 tentacles, and with a prominent hypostome, more or less trumpet- 

 shaped in expansion. Hydrothecae broadly campanulate, not 

 very deep, and with about 10 12 shallow rounded teeth, in some 

 specimens the margins hardly more than undulate. 



Gonangia borne on the reticulated hydrorhiza, rather large, 

 and with very short plain pedicels. An interesting feature was 

 the fact of a remarkable variation as to the aspects of these 

 organs. Most were rather smooth, oval structures ; but in not 

 a few cases they were strongly corrugated throughout, and ex- 

 amples showing all phases of intergrading in this particular were 

 easily found. 



It may be well in this connection to call attention to a species 

 of Clytia described by Congdon from Bermuda, 1 C. simplex, which 

 has features in some measure intergrading with the one under 

 review. I have not seen Congdon's type specimens, hence have 

 only his general description as a guide. It will be seen that his 

 specimens average considerably larger than my own, and the 

 hydrotheca is given as longer, and with deeper teeth, still it 

 might be worth an attempt to critically compare the types of 

 these several species with a view to ascertaining just what grounds 

 might be found bearing upon their interrelations. 



CLYTIA CYLINDRICA Ag. 



On at least two occasions recently I have taken this beautiful 

 little hydroid. While at times it may be found in considerable 

 numbers, it does not seem to be especially common, though this 

 may be due in part to its very small size. In height the simple 

 stems are from 11.5 mm.; the hydrothecae about 0.5 mm. 



1 Proc. Am. Acad. Arts and Sci., Vol. XLII., p. 471, 1907. 





