REPORT ON THE AMPHIPODA. 227 



1848. SiEBOLD, Carl Theodor Ernst VON, bom 1804, died April 7, 1885 (Friedlander, 



Naturae novitates). 



Lehrbuch der vergleichenden Anatomie der wirbellosen Thiere. Berlin. 1848. 



1849. Brandt, Johann Friedrich. 



Symbolse Sirenologicas, quibus prsecipue Ehytinse historia naturalis illustratur 

 auctore Joaune Friderieo Brandt. (Conventui exhib. die 23 januarii 1845.) 

 Appendix II. De animalculo parasitico peculiari {Cyamo f vel rectius forsan 

 Sivenocyamo f Rhytinw) in Rhytinw cuticula a Stellero observato una cum Rhytina 

 et Ascaridihus ejus deleto. Memoires de I'Aeademie imperiale des Sciences de 

 Saint-Petersbourg. Sixieme serie. Sciences uaturellcs. Tome V. St.-Petersbourg. 

 1849. pp. 153-157. 



»• 



After quoting Steller's account, Novi Comment. Petropol. t. ii. pp. 298, 324, and 330, and 

 considering how far it agrees or disagrees with, the genus Cyamus, I>randt continues, " Ad 

 stabiliendam tamen difEerentiam genericam aliorum Sireniorum ordinis animalium pcdiculorum 

 cognitio adhuc optanda videtur. Qua de causa pro tempore parasitum EhytiuEe dubitanter 

 (sicuti signum interrogationis indicat) generi Cyamorum quidem inseruimus, sed in paren- 

 thesi nomen hypotheticum Sirenocyamus interrogationis signo addito pariter exhibuimus 

 antequam, quae sequitur, descriptionem ejus in ordinem systematicum redactam pro- 

 ponimus. 



"Cyamus (?) num genus proprium Sirenocyamus (?) R h y t i n ee. 



" Pedes mandibulares biarticulati, extremitate acutissimi et clavati. Pedum thoracicorum sex 

 paria. Pedes thoracali annulo inserti chelis sLmOes, biarticulati. Appendices respiratorise a 

 Stellero non descripta?. (An cliaracteres generis Sirenocyamus ?). 



" Characteres specifici. 



" Habitus fere, ut videtur, Cyami gracilis. Caput oblongum, acutum. Antennulai geniculata;, 

 duse, breves, 1/2 lineam longEB, e fronto exporrectse. Annuli corporis pro numero pedum sex, 

 dorso oonvexi, 1/3'" lati, a primo ad ultimum annulum (caudam) sensim angustiores. 

 Thoracis annulus sequentibus duplo latior, lentis dimidium referens. Annulus ultimus seu 

 caudalis orbicularis. Pedes (exceptis illis, qui ad latera thoracis erant adnati et chelas 

 crassas, biarticulatas, aouleo flexili firmissime Rhytinse cuticulae infixas referebant) 

 graciliores, omnes aculeis prfefiniti et sensim breviores ; ultimi duo brevissimi ex annulo 

 caudali emergentes coriiusculum praefiniebant, ac dum auimalculum gradiebatur dirigo- 

 bant. 



"Corpus dimidiam plerumque unciam longum, diapbauum. — Color candidus aut subHavus." 



If the creature was correctly observed by Steller, the genuine Cijami, Brandt says, differ from 

 it: — "Pedibus mandibularibus [maxillaribus] 5-articulatis, pedum corporis genuinorum 

 parilnis quinis, omnibus quinque-articulatis, necnon appendicibus respiratoriis in secundo et 

 tertio corporis annulo pedum loco conspiouis." He tliinks that the Rhytina's parasite may 

 have been allied to the Leptomerx rather than the Cyami, and contemplates the possibility 

 of finding other Sirenonjami still living on other Sirenia. 



