496 REPORT OP COMMISSIONER OF FISH AND FISHERIES. [44] 



The length of the larger hooks on the proboscis is about 0.0S mm ; of 

 the spines on the collar from 0.05 mm to 0.06 lnm ; of the spines in the ven- 

 tral rows from 0.0G mm to 0.07 mm . 



In specimen No. 1, of which measurements are given above, the num- 

 ber of spines visible on side in the first ventral row was 24 ; the num- 

 ber visible on one side in the second to the twenty-first rows, respect- 

 ively : 1G, 13, 13, 16, 17, 13, 13, 12, 12, 10, 11, 12, 11, 9, 9, 9, 8, 7, 10, 6. 



Habitat.— Common Flouuder (Paralichthijs dentatus), Squeteague (Cy- 

 noscion regale), Blnefish (Pomatomus saltatrix). In peritoneum and 

 mesentery. Wood's Holl, Mass., July and August, 1884-'85. 



Echinorhynchus proteus Westrumb. 

 [Plate VI, Figs. 3-5.] 



Dnjardin, Hist. Nat. des Helminth., p. 529. Molin, in Sitzungsb. d. Kais. Akad. d. 

 Wissenscb., xxx, 143, and xxxiii, 295. Leidy, Proceed. Acad. Phila., v, 208, and viii, 

 48. Greef, Wiegmann's Arehiv, i, 361-375, tab. vi. Pagenstecber, Z. f. w. Z., xiii, 

 413, tab. xxiii-xxiv. Leuckart, Menscb. Paras., ii, 785-817. Molin, Deukscb. d. K. 

 Akad., xix, 272-3, tab. ix, fig. 2-3. 



For detailed synonymy and babitats seeDiesing, Systema Hr.iniiath., ii, 51-53, and 

 Revis. der Rbyngo., 754. 



Proboscis cylindrical or often subclavate, with about 6 to 8 longitudi- 

 nal series of recurved hooks visible on one side, 12 to 20 in each series. 

 Median and anterior hooks flat and thin, postero median and posterior, 

 slender. A thin-walled, spherical bull a immediately back of the pro- 

 boscis, followed by a long, slender, cylindrical neck. Body fusiform, 

 slightly swollen and rounded anteriorly, obtusely rounded posteriorly; 

 color varying from light lemon-yellow to orange. Length, 15 mm to 



— < > • 



Measurements of a living specimen. 



Millimeters. 



Length of specimen 23. 00 



^engtb of proboscis 0. 75 



Diameter of bulla •: 1-75 



Length of neck 4.50 



Length of body 16-00 



Diameter of body, anterior 2. 00 



Diameter of body, posterior end 0. 77 



Diameter of neck, median ' 0. 25 



Diameter of proboscis, anterior 0. 17 



Diameter of proboscis, median 0. 31 



These parasites were found in great numbers attached to the inner 

 wall of the large intestine of the Striped Bass (Roccus lineatus). They 

 differ from most intestinal parasites in being highly colored. While 

 the prevailing color is orange of different shades, many were observed 

 which were a light lemon-yellow, and others intermediate between these 

 colors. 



