806 LARVAL CESTODE PARASITES OF FISHES— LIXTOX. 



I append the followiug extracts from notes made on the above several 

 lots: 



1. Leu«4tli of oue in lie.sh water, 04 iimi.; greatest breadth, near 

 head, 10; least breadth, 5; constantly altering its shape. Another, in 

 salt water, measured 103 mm., and another 130. Length of proboscis, 

 1.58; breadtli of proboscis, I.IG; length of hooks, 0,018; lengtli of con- 

 tractile bulb, 1.73; breadth, 0.88. 



2. Specimens had been hardened in Perenyi's tiuid. Largest, length, 

 71* mm. ; greatest breadth, 7. Another, length, 50 ; greatest l)readth, 8. 



3. Of nearly uniform size, alcoholic specimens, length, 50 mm.; 

 breadth, 0. 



Three specimens of 7'. hicolor were found in this lot with their heads 

 penetrating the bodies of /»'. uitenuatus. 



4. The largest specimen in this lot (alcoholic) had the followiug 

 dimensions: Length, 62 mm.; breadth of head, 5.5; thickness of head, 

 1; greatest breadth, 9. 



A large cyst was found in this lot, 37 mm. long, [^Q broad, and 12 

 thick, which contained a coiled larva, apparently the same as the free 

 larva', but it had undergone a kind of waxy degeneration to such a 

 degree as to obliterate specific characters. This cyst had a ])edicel 

 about 00 mm. in length. 



A few other waxy cysts, smaller than the above, were included in 

 the lot. 



12. OTOBOTHRIUM DIPSACUM, new species. 

 (Plate VI, fi^s. 1-5.) 



I record under the above new specific name the following notes made 

 on a unique tetrarhynch enjbryo from a cyst in a bluefish [Fomatomus 

 saltatrix), (No. 4794, U.S.N.M.). 



The cyst was oval, about 12 mm. in the longer and in the shorter 

 diameter, and consisted of an outer transparent coat, separable with 

 needle jioints into two layers, and an almost opaque, granular, dirty- 

 yellow coat, which appeared to be lined with a very delicate trans- 

 parent membrane. The blastocyst when liberated was found to be 

 pear shaped, translucent white, ])eautifully reticulated, 8.5 mm. long, 

 in diameter at the larger end, and tapering tlirougb an offset to a 

 blunt point. At the middle of the base there was a puckered appear- 

 ance, due, ai)i)arently. to radiating contractile fibers. The blastocyst 

 was constantly undergoing changes of form, which had the appearance 

 of being caused by spasmodic contraction of the semitiuid parenchyma 

 with which it was abundantly supplied. When the embryo was liber- 

 ated from the blasto(;yst, it had the followiug dimensions, slightly 

 distorted by compression : 



