[27] ENTOZOA OF MARINE FISHES OF NEW ENGLAND. 479 
Millimeters. 
eee ics an ane ela anion nals aid g pmineid waaieas fh ciqcnp cinema eels one ou 0.74 
IGE NONLOFIO’ BEOMIONUS 6. 0) ¢ vanes nu oeas quelsssecee seueeeicninese canes 1.90 
Breadth of posterior segments ...--..-- Sey ete Ae rie Sing cis oe cieiaisae la one dina eee 0. 84 
In another specimen: 
Mee PUM MORVETIOSOPMONtS. sac ols. Joo Ws a2 ou ee le dents nee dnesaecedseceese 2. 20 
SEMINOLE HUSLPEION SCSIMICNES* = 4r2 cps ew ws nh. 5 lla a sled ees ede aniocdelseo ewe 0.73 
Number of joints in onespecimen about 342, the last 11 of which were 
mature. 
There was one prominent, transverse rib at about the posterior third 
of each bothrium ; another, much less prominent, about the middle, at 
the extremities of the inner pair of recurved hooks, and two other 
faint, transverse lines, parallel with the ribs and apparently homolo- 
gous with them, between this and the base of the hooks. The trilocu- 
lar auxiliary acetabula showed but faintly in most of the specimens. 
There is considerabie difference between the anterior segments of the 
specimens examined and those figured by Van Beneden (Vers Cestoides, 
tab. xii). In Van Beneden’s figures the anterior segments are repre- 
sented as being several times as long as broad, and with the flaps rudi- 
mentary and rounded. The sketches of the head and anterior segments 
(Figs. 1, 2) were made from a mounted specimen. The proportions are 
identical with those of the living specimens, as is proved by comparing 
these sketches with some memorandum sketches made at the time of 
collecting. Among all the specimens, eight or ten in all, not one was 
noticed in which the segments differed materially from those repre- 
sented in the figures. In Wagener’s figures (Entwick. d. Cestoden, 
tab. xxii, fig. 274) the proportions of the anterior segments are about 
the same as I have found them. The transverse cost of the bothria 
do not agree exactly with the figures of Van Beneden and Wagener, but 
the differences are so slight, that I have no hesitation in pronouncing 
the specimens which I have examined identical with those figured by 
Van Beneden and Wagener. 
Family DIBOTHRIORHYNCHIDA! Dicsing. 
RHYNCHOBOTHRIUM Rudolphi. 
Tenie spec. Fabricius. 
Bothriocephali (Rhynchobothrii) and Tetrarhynchi spec. Rudolphi. 
Bothriorhynchus Van Lidth. 
Rhynchobothriwm bisulcatum, sp. nov. ° 
[Plate IV, Figs. 9-23. ] 
Head subconical, bluntly rounded in front. Bothria two, lateral, 
separating slightly at posterior corners, coalescing in front, each di- 
vided into two distinct lobes by a median suleus, which extends from 
the posterior border about one-fourth the length of the bothrium, where 
it divides into two less distinct but clearly marked sulci, which diverge 
