11 



from the same group. But six species have been recorded from North 

 American Diplopods and of these but two are species of Stenophora. 

 On the other hand four genera, Gregarina, Stenophora, Cnemidospora 

 and Ampiwroides are represented. It is entirely probable that the known 

 gregarines of North American Diplopods are but a small part of the 

 total number parasitic in these forms. 



Gregarinidae. 

 1) Gregarina calverti Crawley. 



Crawley, Proc. Acad. Nat. Sci. Philad., Vol. LV, Pt. I, p. 49, pi. II, 

 fig. 19 — 21, 1903, (Wyncote. Perm., from Lysiopctalum laeterium); 1. c, 

 Vol. LV. Pt. Ill, p. 638, pi. XXX, fig. 15. 1903. 

 2 ( ircgarina polydesmi virginiensis Leidy. 



Leidy, Trans. Amer. Phil. Soc," Vol. X, N.S., p. 238, pi. 10, fig. 23—29, 



1853, (Pennsylvania, from Polydesmus virginiensis). 

 Crawley, Proc. Acad. Nat. Sci. Philad.. Vol. LV, Pt. I, p 45—46, pi. II, 

 fig. 35, 1903, (Wyncote, Penn. , and Raleigh, N.C., from Polydesmus vir- 

 giniensis). 

 3) Cnemidospora spiroboli (Crawley). 



Stenophora spiroboli Crawley. Proc. Acad. Nat. Sci. Philad., Vol. LV, Pt. I. 



p. 51-52, pi. II, fig. 22, 1903, (Raleigh, N.C., from Spirobolus sp.). 

 Cnemidospora spiroboli Crawley, 1. c, Vol. LV, Pt. Ill, p. 638 — 639, pi. XXX, 

 fig. 7—9, 1903. 



Stenophoridae. 

 4 Strnophora larvata (Leidy). 



Gregarina larvata Leidy. Proc. Acad. Nat. Sci. Philad., Vol. IV, p. 232, 1848, 



(Pennsylvania, from lulus marginatile). 

 Gregarina julimarginatae Leidy, Trans. Amer. Phil. Soc , Vol. X. N.S.. 



p. 237, pi. 10, fi<r. 1—20, 1853. 

 Gregarina jidipusilli Leidy , Trans. Amer. Phil. Soc, Vol. X, N.S., p. 238, 



pi. 10, fig. 21 — 22, 1853, (Pennsylvania, from lulus pusillus Say. . 

 Stenophora juli Crawley, Proc. Acad. Nat. Sci. Philad., Vol. LV, Pt. I, p. 51, 



1903. (from lulus sp. and Paraiulus sp.). 

 Stenophora jidipusilli Crawley, 1. c, Vol. LV. Pt. Ill, p. 634, pi. XXX, 

 fig. 16—17, 1903, (Eastern U.S. , from lulus. Paraiulus and Lysiopetalum 

 laeterium Say ; ; Hall, Studies Zool. Lab. Uni. Nebraska, No. 77, p. 149, 

 1907, (Lincoln, Nebraska). 

 5) Stenophora robusta sp. nov. 



Boulder, Colorado, from Orthomorpha gracilis and Paraiulus venustus. 

 Actinocephalidae. 

 6 Ampiwroides fontariae Crawley. 



Crawley. Proc. Acad. Nat. Sci. Philad., Vol. LV, Pt. I, p. 53, pi. I, tig. 12— 

 14, 1903. (Wyncote, Penn., and Raleigh, N.C., from Polydesmus sp. and 

 Fontaria sp.). 



3. Entwicklung und phylogenetische Bedeutung des Medianauges bei 



Crustaceen. 



Von Dr. Theodor M or off. 



Mitteilung aus dem Bakteriologischen Institut in Sofia (Bulgarien). 



(Mit 9 Figuren.) 



eingeg. 9. Mai 1912. 



Bei einem großen Teil der Crustaceen existiert zeitlebens in der 

 Medianebene des vorderen Kopfteiles ein unpaariges Organ, das infolge 



