DETERMINATION OF GENERIC TYPES, ETC. 37 



Diesing (1851a) returned aceti, glutinis, and tritici [as graminearum} 

 to Anguillula, while he placed terricola in Angiostomum, thus elim- 

 inating all of the species from Rhabditis which Dujardin had placed 

 in this genus. 



Bastian (1865c, 110) definitely designated aceti&s type of Anguillula 

 " since this appears to have been so regarded by Ehrenberg." Bas- 

 tian's reasoning in this case meets with the serious objection, however, 

 that aceti was not one of the original species of Anguillula new genus 

 Hemprich & Ehrenberg, 1828; hence, that it could not under any cir- 

 cumstances be type of " Anguillula Ehrenberg." Bastian further 

 includes in "Anguillula Ehrenberg" A. glutinis (which he was unable 

 to examine); also A. fluviatilis, which he looks upon as an "altogether 

 doubtful animal," which "may perhaps belong to the genus Plectm;" 

 and several other species. 



According to Minot, "the true name of the vinegar eel is Leptodera 

 oxyphila, but most authors still call them Anguillula aceti. 

 The same worm apparently appears in fermenting starch paste, 

 although the starch worm has received a different specific name, 

 L. glMtinis" 



Authors differ in opinion regarding the identity of aceti and gluti- 

 nis. If they are specifically identical, then our interpretation of 

 glutinis as type of Anguillula, 1786, amounts to practically the same 

 (from a systematic point of view) as Bastian's interpretation that aceti 

 is type of " Anguillula Ehrenberg," although he and we have argued 

 upon different premises; if aceti and glutinis are not specifically iden- 

 tical, but are so closely allied that authors are in doubt as to their 

 exact status, then they will probably be at least congeneric, and our 

 interpretation that glutinis is type of Anguillula, 1786, will not 

 materially alter the present classification so far as these two species 

 are concerned. 



CASE OF Capsularia ZEDER, 1800. 



Capsularia is a much less complicated case. It was proposed with 

 two species Solaris and halecis. In 1802, Rudolphi renamed both of 

 these species capsularia, placing the first in Ascaris, the second in 

 Filaria. The choice is therefore open to select either as type of Cap- 

 sularia, and on basis of page precedence, Solaris may be taken as type. 

 This also agrees with elimination, as halecis was afterward (1824) 

 placed (in part) in Filocapsularia communis. 



It may be noted that in the case of Anguillula the specific name 

 existed before the generic name was used; in fact, the species was 

 raised to generic rank. In Capsularia and Angiostoma the generic 

 names were later reduced to specific rank. Cystidicola also represents 

 a case in which the generic name was later reduced to specific rank. 



