Hippolyte fascigera and H. gracilis. 149 



four. Mr. Hornell's specimen agrees with Czerniavsky's 

 figure M. 



In an earlier work by the same author (' Materialia ad 

 Zoogr. Pont, comp.' 1868) he figures still more varieties, for 

 drawings for which I am indebted to Dr. A. M. Norman, 

 F.R.S., who called my attention to the fact that in two of 

 them are shown tufts of plumose setse. 



Fig-. 1. 



Fig. 1. — Hippolyte varians, Leach. (After Kinahan, Nat. Hist. Review, 



vol. iv. 1857, pi. x.) 

 Fig. 2. — Hippolyte gracilis (Heller). (After Czeruiavsky, Crust. Decap. 



Pontica littoralia, pi. i.) 



As it appears therefore (1) that the fascicles or tufts of 

 setae are not confined to H. fascigera, and (2) that the other 

 distinctive characters relied on by Gosse are of no value, we 

 may safely conclude that this species should be expunged 

 from our lists. 



There remains the interesting question as to the mode by 

 which the tufts are acquired for protective purposes. It is to 



