138 PHILORTHRAGORISCUS SERRATUS. 



to Dinematura serrata, described by Kröyer in his »Bidrag 

 til kundskab om Snyltekrebsene" p. 176, pi. VIII, who 

 however was unable to give any information about the 

 origin of this CrustaceaUo As Kröyer's description is rather 

 sufficient to recognize our parasite , I will especially dwell 

 in the following remarks on those characters , which prove 

 that it cannot be ranged in the genus Dinematura; more- 

 over the description of a small specimen will be added, 

 that probably represents the unknown male of our species. 



As already stated by Kröyer, the animal shows some 

 resemblance to Laemargus muricatus , but it is still a third 

 smaller than the male of this species, and measures only 

 7^2 ^ 8 mm. The cephalothorax is rather deeply emargi- 

 nated posteriorly like in Cecrops, thus forming two rounded 

 lateral processes and a truncated median part. On the 

 latter, at its posterior margin, there is a row of conical 

 tubercles , which seems to have been overlooked by Kröyer, 

 while the lateral margin of the cephalothorax has a cre- 

 nulated appearance by the presence of rather small tuber- 

 cles. The second and third segments are coalescent and 

 show a single oblong dorsal face, with a large wing- shaped 

 process on each side. The fourth segment bears a deeply 

 clefted dorsal shield, covering almost half the genital segment; 

 its anterior margin is declivous, plain, and produced la- 

 terally in a small spine; its posterior border is rounded 

 and crenulated. The genital segment is nearly round , with 

 a deep fissure extending over the posterior third of its 

 length ; the anterior half of its margin is plain , the poste- 

 rior one crenulated , and on the limit of both there is a 

 small spine. On the ventral side of the genital segment 

 of several individuals I observed a couple of brown , trumpet- 

 shaped bodies (fig. 11) which undoubtedly represent the 

 spermatophores ; they have a narrow tube passing through 

 their whole length and are attached with their broadest 

 part on each side of the base of the abdomen. 



The abdomen is not lengthened like in Dinematura , 

 but rather short, the distal end of the caudal stylets only 



JSotes from the Leyden Museum, Vol. XIX. 



