462 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [10] 
ent oecurrence of an imperfect segment of triangular shape interjected 
between two others which are but slightly irregular; in other cases it 
has the appearance of two segments, one lying diagonally across the 
other and the two, as it were, welded together. Measurements of the 
head are not satisfactory on account of the extreme contractility of 
that part. 
The following measurements were made from a mounted specimen 
corresponding in position and appearance with Fig. 9: 
Millimeters. 
Enon. tipito tip of extended bothria.~- 2 2 5-sm)sce> solace eb sashes eee 1. 48 
From apex of proboscis (retracted) to neck... 2. ence -cemcn -cocone seueee 0. 96 
ALBAN AOU Kis acim Saisie = Gis aoe mn lalate Sales ctiape winias Cte ace 0. 20 
fenwuoon Wish SOPMeNt +s. --\on.qccined coainne os Seana ste < toa a -iae = 0. 20 
(ene nheoiaiIst SOSMENb eco. -swn awe cee sce macser seca. += \me se oe nl see eee 0. 04 
Distance trom (head: to first segments... -- sass. See ee Pee 1.40 
Mencth)of amature, seoment: oo 22.5 eos. weno ercee jaca ees <siee = eee 2. 60 
Preach Obs MAbUTS SOOMEME (a. soc ein sce nonce miciivintsens las) sive ake eee 0. 60 
Eongunof sepment near posterior. << <2 6 gece een sic nce nieeeems = ser = oie ene 1.20 
Breadun of serment near posterior --.< J... << -\s-ceene oc eee es ope o'= as cee 0. 50 
Henethofloncest living strobilev:..25 2 Y..J2 53-2 esc eee wos ewe eee neemee 108. 00 
Habitat added: Common Skate (Raia erinacea), spiral intestine. 
Wood’s Holl, Mass., August 25, 1884. 
SPONGIOBOTHRIUM,* gen. nov. 
Body articulate, tenieform. Head separated from the body by a neck. 
Bothria four, opposite, pediceled, broken up into locinio-crispate folds, 
which are transversely costate. Unarmed; auxiliary acetabulum none} 
terminal papilla none. Genital apertures marginal. 
This genus combines many of the characters of Hcheneibothrium Van 
Beneden and Phyllobothrium Van Beneden. It differs from the former 
in the lacinize of the bothria and in the absence of a terminal haustel- . 
lum; from the latter in having pediceled instead of sessile bothriay 
and in the transverse cost on the bothria. 
Spongiobothrium variabile, gen. et sp. nov. 
[Plate II, Figs. 13-19. ] 
Body articulate, taeniwform. Head separated from the body by a 
short neck, subquadrangular, tapering posteriorly, continuing at the 
anterior angles into four bothria. The bothria are pediceled and on 
their outer faces and borders are broken up into a number of delicate 
frill-like laciniw, which are sometimes gathered into a more or less com- 
pact mass of crisp, puckered, or purse-like folds (Fig. 15) and some- 
times expanded into long, curved, auriculate, or leaf-like flaps (Fig. 16), 
These are marked by transverse, parallel costs which originate from a 
middle portion like the midrib of a leaf. There is no trace of either a 

"Xx0yyos = a sponge or mop. 
ys + 
