794 LABVAL CESTODE PAHASFTES OF FISHES— LINTON. vol. xix. 



0.8 mm. iu lengtli, and were 0.04 in diameter (Plate II, fig. 12). (Xo. 

 4700, U.S.N.M.) 



2. Cysts from the crevalle {Caraax chri/,s(),s). The embryos contained 

 in these cysts are small, bnt the proboscides are relatively long. Some 

 of the dimensions are: Length of i)roboscis, approximate, 1.5 mm.; 

 diameter, exclnsive of hooks, 0.02; length of contractile bulbs, 0.38 j 

 diameter, 0.00; length of longest hooks observed, 0.015 ^Plate II. figs. 

 i;?-15). (Xo. 4700, U.S.N.M.) 



The contractile bulbs M^ere slightly sinuous. The hooks bear some 

 resemblance to those of 7v. hctcrosphic, Linton. 



3. Cysts collected at Woods Holl, Massachusetts, August 2G, 

 1S85, July 23, and September 1, 1886, and August 20, 1880, from the 

 peritoneum of the common Eel (Atujuilhi i-Jirysi/pa] (Plate 11, fig. 10). 

 (Xo. 4704, r.S.X.M.) 



The proboscides were retracted and the arrangement of hooks was 

 difficult to make out, but they appear to be identical with those of the 

 specimens from Caranx, mentioned above. The longest hooks were 

 about 0.011 mm. in length. 



Dimensions of a living specimen somewhat compressed (Plate HI, hg. 

 1): Length of embryo, 5 mm.; lengthof bothrium, 0.7; breadth of both- 

 rium,0.G3; diameter of neck, narrowest part, 0.35; length of proboscis, 

 estimated on retracted organ, 1.4; length of contractile bulbs, 0.42; 

 diameter of contractile bulbs, (M>7 (Xo. 4774, U.S.N.M.). 



3a. Figure 1, Plate IV, is a sketch of a cyst from the stomach wall of 

 Cyno.sclon rnjaJis, Woods IIoll, Massachusetts, September, 1884. 



The sketch repi-esents the cyst compressed so as to show the blasto- 

 cyst and embryo. This appears to be identical with the specimens from 

 Caranx and Autjnma. (No. 4820, U.S.X.M.) 



4. Cysts from nnicous mend)rane of the tomcod [Mk-rixiadus toincod), 

 Woods Holl, ^Massachusetts, July 23, 1880. These agree very closely 

 with the specimen described above, especially with those from Anguilla 

 chrysyiMi. The cysts were elongate-pyriforni, with the embryo coiled up 

 in the larger end (Plate III, fig. 2). The elongated neck-like part of the 

 cyst was dull yellowish ; the embryo ivory white surrounded by the trans-, 

 lucent white blastocyst. The latter when removed was also pyriform- 

 elongate, or rather gourd-shaped, with the embryo in the larger eud 

 (No. 4832, U.S.N.M.). 



5. Cysts from the cero [It^combcronioriis r<'(/<(li.s). Woods Holl, Massa- 

 chusetts, July ,'iO, 1880, peritoneum, associated with larva- of tetra- 

 rhynchus (Cat. No. 5475, T.S.N.M.). 1 )etails of hooks could not be made 

 out; general habit of larva- like tliose described above. Length of 

 cysts, 2.8 mm. 



0. Larger cysts from same host, same locality, August 13, 28, 1880, 

 l)eritoneum. In first lot the proboscides were retracted, approximately, 

 3 mm. in length; length of longest hooks observed was 0.02. Second 

 lot, cyst oblong, 3.5 mm. long and 1.25 broad ; end)ryo about 5 in length; 



