PARASITES 01' FISHES OF BEAUFORT, N0RTB CAROLINA. 327 



The following new specific names are proposed: 



Aspidogaster ringens from ificropogon wndulatus and Trachinottus carolinw. 



Dwtomum aduncum from Opsanus taw. 



Dlstoynum corpulentum from Lagodon rhomboides and Ovthopristis chvysopterus. 



Distomum imparispim from Rachycentron canadus. 



Distomuin inconstans from Chsetodipterus faber. 



DiMomum pectinatum from Bairdiella chrysura ami Trachinotus carolinus. 



Gasterostomum baculum from SkomfteromorMS macutaftis. 



(In*!* rn.stnni'nn gorgun from Seriola lalandi. 



Other distomes were found which are evidently new, but to which it is not 

 desirable to give names until more material is available. The form shown in tie;. 204 

 is a ease in point. In the find represented bythatfigure there was but one specimen, 

 and it was necessary to cut it into sections before the anatomy could be made out. 



The appendiculate distomes referred to the species />. monticellii were found in L9 

 species of fish. In many eases they were immature, so that identification was not 

 always certain. The ratio between oral and ventral sucker was not uniform. In 

 some the diameter of the ventral sucker was less than twice that of the oral; in others 

 it was more than three times as great. In the case of the specimens from Menticir- 

 /■li us, i, a, ricanus it is likely that more than one species is recorded under 1>. rnontiet llii. 

 The adult worms referred to this species agree fairly well with the one from Rachy 

 centron canadus (fig. 154). The most characteristic feature is the lobed vitelline 

 glands. 



I think that there is much reason to believe that the same species of distome is 

 affected differently by different specific hosts in which it becomes adult. 



The forms which were referred to the genus Aspidogaster were particularly 

 difficult to classify. Their position in this genus must he regarded as provisional, 

 and points to the probable necessity of either extending.the limits of the genus 

 Aspidogaster, or of establishing a new genus. 



A Gasterostomum, found in 8 species of fishes, has been referred to the species 

 G. gracilescens Rudolphi. 



The abundance of representatives of this genus is especially interesting and sug- 

 gestive in view of the relative abundance of the larval Gasterostomum {Bucephalus 

 lull in, , i mi* Lacaze-Duthiers) in the oyster. 



In all cases the number of trematodes and of adult cestodes, nematodes and 

 acanthocephala given on any date represents all that were seen. This is not the case, 

 however, with many of the encysted forms. In a few cases the number recorded 

 simply indicates the number of cyst-- collected by my assistant. As a matter of fact, 

 such forms as the encysted larva- of Otobothrium crenacolU and Tetrarhynchus Msul- 

 catus as a rule occur in relatively large numbers. 



The plan followed in this paper, of arranging the parasites by number under the 

 several hosts, will, it is believed, make it possible to refer to any form with almost as 

 much precision as if specific names had been given less sparingly. In order to 

 simplify the work of printing this report a list has been prepared of all the species 

 mentioned in it which have been described in my former papers, with references to 

 the literature. References to the appended list of papers only are given, since in them 

 will be found citations to other and older literature. 



