9 -NOTES ON ENTOZOA OF MARINE FISHES OF NEW ENGLAND, 

 WITH DESCRIPTIONS OF SEVERAL NEW SPECIES. 



part ii. 



By Edwin Linton. 



The following paper contains notes on forty-two species of Cestod 

 worms, eight of which were described in my former paper.* 



After having had access to new material for study, with some added 

 experience in the study of these difficult and often perplexing forms, I 

 have been brought to somewhat different conclusions from those arrived 

 at in my first paper. The changes in the nomenclature of the first 

 paper are in brief as follows : 



(1) Phyllobothrium thysanocephalum is referred to a new genus, and is 

 recorded in this paper by the name Thysanocephalum crispum Lt. 



(2) The species recorded as Rhynchobothrium tenuicolle Rudolphi I now 

 regard as a different species. It is referred to a new species in this 

 paper, and bears the name Rhynchobothrium bulbifer. 



(3) Rhynchobothrium bisulcatum of my first paper was referred to the 

 wrong genus. It is recorded in this paper as Tetrarhynchus bisulcatum. 

 The reasons for the above changes will be found among the observations 

 on the species. 



Genera with regard to which there is some doubt are Spongioboth- 

 rium, Anthocephalum, Orgymatobothrium, and Grossobothrium. 



There are peculiar difficulties in the way of classifying the unarmed 

 Tetrabothriidce and more investigation is needed in order to arrive at 

 the truth. Further investigation upon fresh material may render it 

 possible, as it is certainly desirable, to uuite several genera of the 

 Tetrabothriidas. 



It is with much reluctance that I have found myself obliged to add 

 several new generic names, some of which, after further study of new 

 material, may have to be relegated to the already spacious limbo of 

 synonyms iu this order. I find, however, that the descriptions which 



* Notes on Entozoa of Marine Fishes of New England, with descriptions of several 

 new species. Report of U, S. Fish Commissioner for 1880. Pp. 453-510. Plates I-VJ, 



[1] 719 



