[21] ENTOZOA OF MARINE FISHES OF NEW ENGLAND. 473 
found protruding as much as 0.5™™, It is covered with minute spines 
whose length is about one-eighth the breadth of the penis. The vas 
deferens is a long convoluted tube lying for the most part a little in 
front of the center of the proglottis. The central part of the proglottis 
around the ova is filled with the large glandular masses of the testes. 
The longitudinal vessels of the water-vascular system can usually be 
distinguished and between them and the margin, on each side, a series 
of granular masses, more opaque and smaller than the masses which 
make up the testes, extending to the ovary and widening in the vicinity 
of that organ. The lateral aperature for the discharge of eggs is sit- 
uated a little way back of the middle and is surrounded by a low bor- 
der or lip. Itis ovalin outline, the longer axis coinciding with the 
longitudinal axis of the segment and equal to about one-eighth the 
length of the segment. Its posterior edge is at about the posterior 
third of the segment and nearly opposite the marginal opening of the 
generative organs. 
The following measurements were made upon living specimens which 
had lain for a few hours in fresh water: 




Dimensions. No. 1. | No. 2. | No. 3. | No. 4. 
mm. mm. | mm. mm. 
sR GEESPOUM DE aa= tants Nola soie wclole a place mie cine sa te clita cwiniesteiceean 100. 00 | 142.00 | 195. 00 212. 00 
eae RCO Cem cle soins = dele alae via sie a etate lala im, a) aiken jalan eal = oe re 900 1280 1.8 
ROR eS TPRUT MECN EL ete ico mine ajo ann ae mma alain eS aiainia = 3 BAe amie ae! TroOhin) lead 1.5 
Breadth of segments near head, excluding projecting flaps......---. ONGY) 1) 205565) 90270 0.7 
Menrtihot sepments near heads. -.5 =... ..ceeeet samen cecnwn snes: On), ck) O8385 0. 50 Ory 
rosdinrol POStoriol SCSMeNt(S -. 256). tens ann cencoteceen secccieces iri 1. 26 1. 90 ais) 
BME OLN POSUCTION SC SMICDUS  -) a0 a i5.< o's) sa'sja'e alent nin eine a ielbinins sala p= 1.2 1526 1. 60 ate 





The following measurements are from a segment which became Ue- 
tached from a strobile while still living and active in sea-water : 
Millimeters. 
Le SS eS OR ee eae eee er Ce Sy a 3.10 
ReMPEPRECCVA) TONG 5 coe 2). Dcte ne oar okie ae ania ainles Sat Ss Malo oc idl ala esac ee 1.05 
hire jolie aioe n C0 6 0 GRE ya Re gS Ue A a A ee eee 2.45 
BEES DORLOLIO’ ONO: sae cats Osa ce ane) date naan ea aeeae tatisiss, anda a eeete 2.10 
SE RER GU COMM Sere stele eta eck aerate atte OTA Sal, calorie al» sich oo <2 ouaysinhes IEE 0. 35 
er EDTEONT GMI Me ree A ot giant aia a at Pn eR Se ech cet aa ES Ati en a oe 0. 0875 
HMenanH Ol SPINES ON PSNISs=2 22 a'o- so. S25 See oe ae Sasa pinitis, Satara ict oe ee 0. 0100 
ERNE: CNN Meee eee as) 0 bg wim Sales as oa aya b ate woe ieee Ie Dee 0. 0254 
The breadth given above is approximate, as the segment was con- 
stantly changing its shape; the penis was only partly everted. 
The following measurements are from a young specimen, in fresh 
water: 
Millimeters. 
RC OMEDIELE 2 - ata meee tae S5eeD ah ane ayy on 22 sate setiole «usher 20. 00 
Length of head .......-..-. TAS EER ER RR re 1. 20 
REE ERNNE TOD 3. omer pee ek a ss tye Lia oe leo oe “1.380 
PLEO: ANLGIIOE SUMINMMES ala on o.oo tw oes oes hee te osdeane 0.10 
enna Of ANberion@ecmienttere. o. 22.02. fares ce ele el 0. 30 
Length of median segments _.......-. spe 8 ERR Rye Ne Pa, 0, 07 
Peet OL TMOUIANM SER TROITE 22. cus <2 2.2 So dl eo een soe e cece po nwcceeew ches 0. 90 
Posterior segments but little larger than anterior. 
