[31] ENTOZOA OF MARINE FISHES OF NEW ENGLAND. 483 
guished as var. y (Plate 1V, Figs. 13-16). These are all immature stro- 
biles, but are much longer than var. a, and in some cases as long as 
var. 6. The strobile is much thicker and rather wider than those of 
varieties ~ and /. The posterior segments, although not mature in 
any of the specimens, have a conspicuous male generative organ. The 
female generative opening is represented by a lateral, median, slightly 
raised papillifurm eminence. Length about 100™™; average length 
of last 30 segments 0.6™". The posterior segments are 24 to 3 times as 
broad as long. 
Measurements made from two mounted specimens, 


Dimensions. No.1) |MNox2: 
| mm. mm. 
Length of strobile......... SSA scnen na teC Sorc eS OOEAcaDIa Der OObOnooC eo aiajashacts Suateasioe 92. 00 82. 00 
RCPSEIMIM DOA hess cece coc cee oclte ce cence sco acccccideassascescesudeeueseocsuesesmes re 10 0. 70 
EST MEIER OOM oit= (o.oo oc) (iis eicinc aa ated tala de ema e oa dlociame[s Sab aba aeceaum bigs cae aee 1.18 0. 86 
RRM RMT ERC CKS oats eis ias Soa bine hoeaclsccsaeclena base slepiels cae ciaciscnm oe maae eeicineetaeciae 1.00 0. 60 
Breadth of neck in front ..-..---.-. seh cmiahoeeetaa che aid ths Saibara-clsjaind cheeet saltoaweinna shersen 0. 80 | 0. 54 
revei a Or Neck. POStGNOL GN . 2. ccseence ne cecnsemeseeie cans co chee ck Gata aee Seat 0. 44 0. 40 
Were Ob PEODOSCIS: =).< 2 225-25 -sniececees (OO BE OS ETC RO AE HC OL SRE SCH SMenonc Spseccnercice 0.70 0.70 
Length MUMPLOTUSCISEGHEATN i= eens ne-s nace adas sare se clos seca een ce teem meee ners oeeee 0.90 | 0.70 
Length OMCONETTACTILS DTU: Soi ses Me shee See ea bc Shee SS sRRS Re os sce O ees aseee aes as 0. 46 0. 36 
Pero eGO Er tC unO OUND 2.) san~ conc e a cwe co ae avis css daGnama ne cimatanapewacesocamees 0. 16 0.10 
Prom porestropie wacko neck + .a. [Soa Sete Lis sik ck nclc cess lk Ue eee teeea ceaeeees 0. 30 0. 30 
Maeno iePOSCOPIOLSOCMEDE q2- osemne see Sele none ave cea cisasls ca acbmevisaacamene coma aeee 0. 50 0. 40 
ERE Latnviod POSHCLIOL SO CMONG...\=-/s2e- ce scccaisce cast cacc ane ctaleetesccasecncsescoonen 1. 60 | 1.36 




*In all measurements of the neck the distance from the postero-lateral or postero- marginal edge of 
the bothria to the posterior edge of the collar is the one given. 
In the second lot containing about fifty specimens, the strobiles are 
not so mature as those of the first lot. The three varieties noted in the 
first lot are not so distinctly marked off. There are, however, two dis- 
tinct kinds in this lot, which may possibly be due to the effect of the 
preservatives, but which are sufficiently noteworthy to be mentioned 
here. In the first the lobes of the bothria are smooth and bounded by 
regular curved lines as in the first lot, but with the centers of the faces 
of the lobes slightly hollowed out or depressed, so as to produce the 
effect of a raised border, and double furrows on the lateral face of the 
bothrium. 
In the second the bothria are irregularly furrowed or wrinkled. The 
bothria are shorter than the neck. The neck is also wrinkled. These 
differences, although sufficiently marked to attract attention, do not 
occasion much perplexity where one remembers ‘the wonderful powers 
of contractility possessed by the Cestoidea. They might, however, lead 
to confusion of species in cases where only a few specimens are at hand. 
In describing new species of the Cestoidea, I am satisfied that, where 
it is possible, a great many specimens should be examined before final 
conclusions are reached. If this rule had been adopted by former 
workers in this field of Systematic Zoology the older literature of Hel- 
minthology would not be in its present state of confusion. 
Attachment to the host.—Those found in the pylorus were not firmly 
attached, but would release their hold when the point of a scalpel was 
