[41] NOTES ON ENTOZOA OF MARINE FISHES. 759 



of the bulb and opens in front of and beside the opening of the cirrus 

 in a common marginal cloaca. The remainder of the interior of the 

 segment was filled with roundish or oval bodies about ,025 mm in diam- 

 eter. These are probably the spermatic capsules of the testis. 



In looking over an unassorted lot of entozoa from the shark which 

 was examined July 25, I found sixteen additional specimens of this 

 Anthobothrium. These present the greatest variety of shapes and fur- 

 nish examples of most of the forms already noticed, with many interme- 

 diate forms. The neck, however, in most of them, was moderately elon- 

 gated. Two specimens were noted with excessively attenuated necks, 

 the bothria directed forward with their faces appressed. 



These additional specimens confirm me in the opinion that the diverse 

 forms comprised in these three lots are specifically identical, the differ- 

 ences being due, mainly, to different degrees and conditions of contrac- 

 tion ; while some of the differences are of such regular and constant oc- 

 currence as to deserve to rank as varieties, or at least peculiarities of 

 form, which are liable to occur in the preserved specimens. 



8. Anthobothrium pulvinatum sp. nov. 



(Pulvinns, a cushion.) 



[Plate iv, Figs. 4-9. Plate v, Figs. 1, 2.] 



I was at first misled by the appearance of the bothria of this species, 

 which, in the specimens that I had examined when the following de- 

 scription was written, were uniformly convex and corrugated, and that, 

 too, in both the living and the alcoholic specimens. 



The specimens were therefore referred to a new genus, Ehodobothrium, 

 so named because of the rosette-like appearance of the bothria. It 

 would be unnecessary to mention this change in nomenclature were it 

 not for the fact that I used the name Rhodobothrium in a communication 

 to the American Journal of Science and Arts, March, 1889. 



I take advantage of an opportunity offered during the progress of 

 publication to note that the bothria of this species may assume a quite 

 different appearance from that which is represented in the figures in 

 this paper. In some cases the muscular ring which surrounds each 

 • bothrium contracts to such a degree that the bothrium, together with its 

 pedicel, becomes vase-shaped or even globular. The convex, corrugated 

 surface of the bothrium is, in such cases, retracted, and the bothrium is 

 terminated by a simple orifice or elongated into a papillary termination 

 with the small orifice at its apex. When the bothria are thus contracted 

 the resemblance to Van Beneden's figures of A. giganteum (Mem. Vers. 

 Intest., Plate vn, 5-10) is very striking. 



The disposition of the genital organs in the mature proglottides is 

 different from that in E. giganteum, and the cirrus is echinate instead 

 of smooth. 



