DETERMINATION OF GENERIC TYPES, ETC. 121 



Monodontus Molin, 1861, 435, 463-470. Type species M. semlcircularis. 



[Not Monodon Linnaeus, 1735, 1758, 1766, mammal; Monodon Cuvier, 1817, 

 mollusk; Monodon Schweigger, 1820, mollusk; Monodon Gerv., 18 , mollusk; 

 Monodonta Lamarck, 1799, 1801, mollusk; Monodontes Montf., 1810, molhwk; 

 Monodus Schulze, 1897, for Monodon Linnseus, 1758.] 



wedlii Molin, 1861, 467-469; includes Strongylus cernuus Creplin, 1829 = 

 Strongylus trigonocephalus Rudolphi, 1809 = type of Bunostomum Railliet, 1902. 



semicircularis Molin, 1861, 469-470, pi. 2, figs. 3-4. Type; from Dicotyles tor- 

 quatus. 



Molin bases his anatomical discussion directly upon M. semicircularis, which 

 is the only one of the two species he figures, and which further he (p. 464) 

 specifically takes as an argument to justify his genus. 

 Monohystera, de Man, 1889, 7. For Monhystera. 



Mononchus Bastian, 1865c, 93, 100-103. Type species M. truncatus, designated by 

 Bastian in letter to Stiles, dated March 22, 1904. 



1865: Monorchus Marschall, 1873, 436. For Mononchus Bastian, 1865. 



truncatus Bastian, 1865c, 101, pi. 9, figs. 25-26. 9 



papillatus Bastian, 1865c, 101, pi. 9, figs. 27-28. 9 



macrostoma Bastian, 1865c, 101-102, pi. 9, figs. 29-30. 9 



tunbridgensis Bastian, 1865c, 102, pi. 9, figs. 31-32. 9 



cnstatus Bastian, 1865c, 102, pi. 9, figs. 33-34. 9 



fovearum (Dujardin, 1845) Bastian, 1865c, 102-103. 9 



muscorum (Dujardin, 1845) Bastian, 1865c, 103. 9 



crassiusculus (Dujardin, 1845) Bastian, 1865c, 103. 9 



A slight complication arises in connection with Mononchus, 1865, and Oncho- 

 laimus, 1845. Of the three original species of Oncholaimus, Diesing (1851a, 

 125) transferred attenuatus to Enoplus, thus leaving fovearum and muscorum. 

 Under such circumstances one of these species would most naturally be 

 selected as type. Bastian (1865c) returned attenuatus to Oncholaimus and 

 transferred fovearum, and muscorum to Mononchus. Many authors would 

 hold that Bastian was in error in this action, and that Mononchus should 

 fall as a synonym of Oncholaimus on the ground that it contained the only 

 two remaining species of Oncholaimus. Were it not for the fact that Bastian 

 has written us that he intended truncatus as type of Mononchus we should be 

 inclined to follow that ruling, but as the original author's intentions should 

 be recognized, we accept truncatus as type of Mononchus. 



Oncholaimus now takes attenuatus as type by Bastian' s designation, provided 

 it is admitted that he was justified in returning the species for the sake of 

 establishing the type. 



Monopetalonema Diesing, 1861a, 620, 710. Type species ? M. physalurum by page 

 precedence, or ? obtuso-caudatum by inclusion. See bilinguis. 



physalurum (Bremser, 1851) Diesing, 1861a, 710. $ 9 



obtuse-caudatum Diesing, 1861a, 710; $ 9 = Filaria nodulosa Rudolphi, 1820; 



=Filaria obtuso-caudata Rudolphi, 1819a. 

 Monoposthia de Man, 1889, 9-10. Type by original designation Spilophora costata 



Bastian, 1865c. 

 Monorchus Marschall, 1873, 436. Misprint for Mononchus Bastian, 1865. 



[Not Monorchis Monticelli, 1893, trematode.] 

 monostichum Diesing, 1851a, 306. 



1851: Sclerostomum. 1861: (Esophagostoma. 

 montredonense Marion, 1870, 27-29, pi. I, fig. 1. 



1870: Thoracostoma. 

 morrhuze. 



1871: Ascarophis (apparently type). 



