FISH PARASITES COLLECTED AT WOODS lloLK. 299 



The following dimensions in millimeters were taken from alcoholic specimen : Diameter of head, 

 lateral 1.JI5, marginal, 1.7(>; length of liothrial portion l.S; distance from anterior end to when- neck 

 begins to diminish 1; thickness of nock just back of bothria 1.1; distance to first distinct segments 

 l. r 0; breadth of first distinct segments O.K4; length of last segments (>.">(, breadth O.it, thickness ().:>"; 

 length of head and neck C. Length of large specimen in life, 1T><) mm. Small specimens not measured 

 in life. The longest preserved small specimens are 1S mm. in length. A lew moasiiremonls were 

 made of the head of one in life., as follows: Ureadth, bothria being extended nearly at right angles 

 to axis 1.33; lenglh of head proper, about 0.37; distance from anterior end to base of neck 1.33; 

 diameter of neck just behind the bothria O.lli, diameter just before it begins to abruptly diminish 

 (.:!(>; breadth just back of neck 0.21 ; length of posterior segments 0.32, breadth 0. (>.">. 



In the small specimens the first indication of segments, which appear as faint transverse .1111111- 

 lations, is about S mm. back of the head. The last segments .ire immature. In general proportions 

 and shape they resemble the segments of the large specimen. 



The principal difference between the large specimen and the small ones is in the appearance of 

 the head rather than in any essential dissimilarity of the bothria. In both the bothria are in pairs, 

 and the pairs are on the sides of the head which correspond with the margins of the body. In the 

 alcoholic specimens the bothria are seen to be arranged in pairs, but the anricnlate parts are directed 

 in opposite directions, so that the two anricnlate portions which are seen on the same side of the head 

 really belong to different pairs of bothria (lig. !I3). 



In large and small specimens alike the anterior part of a bothrimn consists of a strong muscular 

 sucker, shaped like, a horseshoe, with the break in its border turned toward the posterior tip of the 

 bothrimn. The latter in the small specimens stands out as an anricnhite appendage nearlv at right 

 angles to the axis of the body, while in the large specimens they are appressed. The neck in each 

 case is thicker than the anterior part of the body, being, in fact, nearly cylindrical for a short dis- 

 tance back of the head, where it diminishes in thickness, and, in the large specimen, also in breadth, 

 rather abruptly. This cylindrical neck in the large specimen, proportionally to the head and body, 

 is much larger than in the small specimens. The enlargement appears to affect the axial part of 

 head also, thus filling in the interbothrial spaces and making the bothria sessile instead of prominent, 

 as in the smaller ones. 



The genus Monorygma is suggested by this species, and indeed Monticelli places the genus Cali/p- 

 trobotlirlum near that genus. The head terminates abruptly without an eminence of any kind, which 

 excludes the genus Monorygma. Again, the muscular auxiliary sucker on the front end of the bothria 

 is of altogether different character from the auxiliary acetabnlum of Phyllobolhrium. 



Sections were made of several of the posterior segments of the largo specimen, and, while the 

 segments are immature, the general arrangement of the reproductive organs could be made out. The 

 cirrus-pouch is pyriform and lies near one of the lateral margins, where it opens near middle of the 

 length of proglottis. Within the bulb lie several convolutions of the vas deferens. The retracted 

 cirrus was minute and not fully developed. A granular appearance on its walls suggested what might 

 later develop into spines. The globular testicules occupy central portion of proglottis, mainly from 

 a little behind the middle to anterior border. The vagina opens in front of the cirrus in a common 

 genital cloaca. The vitelline glands are voluminous and lie along the lateral margins. The ovary 

 was identified as a smallish, lobulnted mass of nuclei lyingnearthe posterior margin of the proglottis, 

 and staining somewhat differently from the vitelline glands. All the organs were for the most part 

 masses of nuclei, staining deeply in carmine and presenting few differences. In the center of the 

 segments was a mass of nuclei, some of which appeared to bo traveling to the vitellaria, and others 

 forming the vas deferens and uterus. The latter, or what was so interpreted, appeared as a relati\ el\ 

 large, open space surrounded by a clustering mass of nuclei. 



Sections of posterior segments from the small specimens show testicules already begun and the 

 rudiment of a cirrus-pouch. 



The neck, when sectioned, is seen to enlarge from the anterior part of the body by the expansion 

 of the inner parenchyma, which consists of loosely intersecting libers with wide meshes, through 

 which the longitudinal vessels pass in strong spirals. In the peripheral portions the longitudinal 

 muscle fibers are very strongly developed. Nuclei are sparse in the central portion of the neck except 

 in the vicinity of the spiral longitudinal vessels. 



The most obvious difference between this species and Montieelli's species is in the character of 

 the neck; in ('. riyi/ii the neck merges imperceptibly into the body, while in ('. orr'ulenlitlc the neck is 

 much, thicker than the body and narrows rather abruptly a short distance back of the. head. 



