46*4 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [12] 



The following measurements were taken from mounted specimens : 



Dimensions. 



No. 1. 



No. 2. 



No. 3. 



No. 4. 



Length of specimen 



Length of bothria 



Breadth of head — side, 



Breadth of head across the top 



Length of one hothrium, expanded 



Breadth of neck 



Distance from head to first stri;e 



Distance from head to first distinct segment 



Length of first segment 



Breadth of first segment 



Length of maturing segment 



Breadth of maturing segment 



Length of posterior segment 



Breadth of posterior segment 



ui in . 



37.00 

 0.96 

 1.35 



in i,i. 



21. (.0 

 0. 00 

 1.60 



mm. 

 23. 00 



mm. 

 74.00 



0. 20 



0. 10 



i. so 



0.10 



0.20 

 1. 60 



0. 32 

 0.74 

 0.50 



1.40 



II. (IS 



0.2(3 

 0. 54 

 0. 2Jt 

 0.80 

 0.46 



1.40 

 3. 00 

 0.20 

 1.50 

 2.00 

 0. 16 

 0. 24 

 (*) 



2.00 



0.24 

 1.00 



2.60 

 0.14 

 0. 32 

 2.00 

 0.42 

 1.56 

 0.86 



* Maturing segments very irregular, some long and narrow, others thick and short with rounded 

 coiners, t Variable. 



Additional measurements of No. 4. 



Segment 4 mm from head 



Segment 20 mm from bead ... 



Segment 30""" from head 



Segment 45 !nm from head 



Segment near posterior end 



Last segment but one 



Last segment 



Free segment 



Fiee segment 



Breadth. 



nun. 

 0.32 

 0.34 

 0.40 

 0.42 

 0.70 

 0. 80 

 0.86 

 0.80 

 0.80 



Habitat. — Sting- Ray (Tnjgon centrum), spiral intestine. Wood's 

 Holl, Mass., August, 1884. 



Phylloeothriu3I Van Benedeu. 



Phyllobothrium thysa7iocephalum i * sp. nov. 



[Plate II, Figs. 1-12.] 



In its sexually mature or strobile condition, this Cestode varies in 

 length from 300 mm to l" 1 . The head, as best seen in young specimens, 

 lias four bothria, which are .quite early lobed and crisped and folded at 

 the edges. In the adult these bothria are deeply lobed, so that even 

 in a cross-section (Fig. 10) it is extremely difficult to make out the four 

 primary lobes. The frilled, crisped, or ruffled structure of the bothria 

 gives to the head, when at rest, a singularly striking resemblance to the 

 short, imperfect branches which form the head in the cauliflower. The 

 neck, or jointless part of the body, is very long. In one specimen, which 

 measures 810'" 111 in length, the first joints appear about 360 mm back of 

 the head. Immediately back of the bothria the head is slightly swollen 

 and subcylindrical, and in alcoholic specimens nearly as wide as the 

 bothria; in the living worm about three-fifths the width of the bothria. 



* Svtioty ofc= a taasel, 



