AMPHINOME ROSTRATA. 159 



name of A. tetraedra Sav.; its length amounts to 200 mm. 

 and the number of segments is 66. It agrees in all res- 

 pects with the Utrecht specimens, except that the bristles 

 are darker coloured, brownish yellow in stead of light 

 yellow and that the stout, straight bristles of the dorsal 

 fascicle are quite smooth and show no trace of serrations. 



By the kindness of Mr. A. A. van Bemmelen, Director 

 of the Zoological Garden at Rotterdam , I received not long 

 ago several Amphinome-s^ecimeüs , found on pieces of pu- 

 mice, floating in the Indian Ocean (probably from Kraka- 

 toa); it is a collection of young and adult animals, mea- 

 suring in length from 5 to 125 mm. In regard to their 

 external appearance they differ not inconsiderably from 

 the A. rostrata-s^eciraens , but they are in a too bad state 

 of preservation to determine if they really represent a new 

 species. The head agrees very well with that of A. rostrata , 

 but the tufts of branchiae are much less developed and 

 darker coloured as in that species; on the contrary the 

 bristle-fascicles are much stouter. The dorsal bristles, es- 

 pecially those with tapered , curved tips , extend a good deal 

 beyond the dorsal cirrus and the branchial tufts , whereas 

 in A. rostrata the dorsal cirrus and the branchiae extend as far 

 outward as the tips of the bristles. The colour of the bristles 

 is also much darker. 



Judging from an example of A, vagans Sav. from the 

 Utrecht Museum , having 23 mm. in length, 1 am quite 

 ao-reeing with M'Intosh, that it should be considered as a 

 young of A. rostrata. Moreover in comparing Savigny's 

 description of this species , it becomes obvious that he has 

 been mistaken in describing it. According to his descrip- 

 tion A. rostrata should be characterized by having the brist- 

 les of the ventral fascicle »terminées par un petit renfle- 

 ment conique ouglobuleux que surmonte une sorte de 

 pointe très-courbée", whereas those of A. vagans should be 

 » s a n s r e n f 1 e m e n t s ." No doubt this description was based 

 on partly disorganized bristles , due to insufficient preser- 

 vation. In examining our Amphinomidae I often met with 



Notes from the Leyden IMixseum, Vol. "VIII. 



