



Prof, E. Eay Lankester on Hamingia arctica 



41 



The males closely resemble 



those of the u Bonellia minor " 

 of Marion, as figured by Vej- 

 dowsky in a woodcut in his me- 

 moir " Ueber dieEibildungund 

 die Mannchen von Bonellia viri- 

 dis, Rol." (Zeitschr. wiss.Zool. 

 vol. xxx. p. 495). Every one 

 of my five male Hamingice 

 is provided with a pair of long 

 recurved hooks (woodcut). 

 The surface of the body is 

 uniformly ciliated. Beyond 

 this the condition of the speci- 

 mens does not enable me to 



any details, excepting 

 there is a spermatic 

 pouch which opens in front of 

 the hooklets. 



The existence of a hook- 

 bearing male is of special in- 

 terest in relation to the fact 

 that Hamingia stands alone 



the Echiuroidea in 



give 



that 



among 



having no genital setse near the 

 genital papillae of the female. 

 It is also of importance as 

 tending to remove any lingering 

 doubt (such as was lately sug- 

 gested by GreefF) as to the 



nature 



of the organisms de- 



A 



B 



4 



I 



scribed by Kowalevsky as the 

 males of Bonellia. 



Further, it is hereby shown 

 that Hamingia, which differs 

 in so many respects from Bo- 

 nellia, and tends rather to 

 agree with Thalassema, is, in 

 respect of its male, in the same 

 case as the former genus. 



Characters of Hamingia, Thalassema, and Bonellia. — I 

 will now briefly compare the three genera Hamingia, Thalas- 

 semia, and Bonellia, as to some of their chief characteristics. 



This is most easily done by means of the tabular statement 

 here following. 



- 



Male of Hamingia arctica, 



A. Whole animal, showing the two 

 hooked setae and the ciliated cu- 

 ticle. Size tV inch long. 



B. A single seta, more highly mag- 

 nified. 





