504 Miscellaneous. 



14. Male and female individuals are distinguishable even in the 

 young state (Trichina spiralis). 



1 5. The immigration of the brood of Trichina in large quantities 

 causes very serious symptoms : namely, peritonitis, in consequence 

 of the penetration of the wall of the intestine by the embryos ; and 

 lameness, in consequence of the destruction of the infected muscular 

 fasciculi. 



16. Feeding upon flesh containing Trichina is also followed by 

 more or less dangerous symptoms, according to the quantity of the 

 imported parasites ; namely, an enteritis, often causing death, accom- 

 panied by bloody (cruposer) exudations, which are sometimes thrown 

 down in ragged clots and evacuated (rabbit), and sometimes con- 

 verted into psorospermia (dog), or pus- corpuscles (cat, mouse). 

 Gottinger Nachrichten, April 30, 1860, p. 135. 



SERTULARIA TRICUSPIDATA. 



To the Editors of the Annals of Natural History. 



GENTLEMEN, Allow me to thank Prof. Greene for pointing out 

 the pre-occupation of the specific name of the above species by Mr. 

 Alder, which had escaped my notice. 



With his permission, I shall alter the name to Greenei, in honour 

 of one of such high promise in our favourite science. 



I am, Gentlemen, Your obedient Servant, 



ANDREW MURRAY. 



On the Strobilation of the Scyphistomata. 

 By P. J. VAN BENEDEN. 



Professor Van Beneden has long held, in common with Desor, 

 and in opposition to Sars, that the Medusae are produced from Scy- 

 phistoma by the formation of a series of buds in the vicinity of the 

 mouth of the latter ; whilst Sars maintained that the Strobile was 

 produced by a transverse segmentation of the body of the Scyphis- 

 toma. The latter has been the view most generally received amongst 

 naturalists, and Professor Van Benedeu now gives in his adherence 

 to it in consequence of some recent observations which he has had 

 the opportunity of making. 



The development of Cyancea takes place, according to him, in the 

 following manner : The Scyphistoma produces no buds ; but a part 

 of its own substance becomes converted into Medusae. The terminal 

 segment, bearing the arms, does not detach itself in the form of a 

 Scyphistoma, to go and live elsewhere, but it becomes a Medusa like 

 the others, and the arms are absorbed in proportion as the Medusal 

 form makes its appearance. The peduncle of the Strobile exhibits a 

 fresh crown of tentacles before the first Medusae are detached. The 

 terminal Medusa, bearing the tentacles which are absorbed, and re- 

 taining the mouth of the Scyphistoma, consequently does not pass 

 through the same phenomena of evolution as the other Medusae. 

 Bull. Acad. Roy. Belg. 2me ser. tome vii. 



