71)8 LARVAL CESTODE PA RA SITES OF FISHES— LINTOK. 



16. Small cysts and free embryos found on several occasions as fol- 

 lows, all at Woods lloll, Massacbusetts, in tliefilefish {Alntera schoepfii), 

 August, 1884, twice; July 31 and Augustl2, ISSo; July 13 and August 

 13, 1887 ; August 5, 1889 (No. 4869, U.S.N.M.). These specimens occur 

 in enormous numbers, appearing as small white specks lying under the 

 serous coat of the stomach and intestine. 



They are of various sizes; one measured 1.3 mm. in length and ().'- in 

 breadth. There are doubtless different species represented among these 

 larva*. 



17. Cysts from walls of stomach and intestine of the sand shark ( Car- 

 charias littoyalis), Woods IIoU, Massachusetts, August 2, 1886. These 

 cysts are small, less than 1 mm. in length, containing blastocyst with 

 embryo, too small and young for successful identification, evidently a 

 xenosite (l>eneden). 



18. (No. 4836, U.S.X.M.) A single blastocyst (Plate IV, fig. 2) from 

 stomach of dogfish {Miistfhi.s caxis), evidently introduced with the food; 

 stomach with nearly' digested fish and crabs. Collected August 1, 1SS9, 

 Woods Holl, Massachusetts. 



The blastocj'st was living and active, but embryo not liberated. 

 Length, 14 mm.; diameter, 0,8, of nearly uniform si;^e throughout, 

 slightly swollen at anterior end, which contained a small embryo about 

 0,048 in diameter at extreme anterior tip. Too rudimentarj' to identify, 

 but from appearance of blastocy^st it is probably a Khi/nchohothrhim. 



19. Blastocyst from wall of stomach of sculpiu (Cottus, sp,) (No. 

 5497, U,S.X,M.), Woods lloll, 31assachusetts, November 11, 1897, Col- 

 lected by Yinal N.Edwards. Length, 20 mm,; diameter, 1.5; color, 

 yellow. The specimen is filled with crumbling parenchyma, is easily 

 broken, and there is no trace of an embryo, 



20. Cysts from sculpin {Coitus, sp.) (No, 5498, U,S.]S".M.), Woods 

 Holl, INIassachusetts, November 6, 1886, Collected by Mr. Vinal N. 

 Edwards, The bottle contains pieces of muscular tissue with a few 

 small fusiform cysts which have degenerated into a waxy and partly 

 calcareous substance, and therefore possess no characters by which 

 they can be classified. It is jiossible that they may not be Rhymho- 

 hoihrium cysts at all, but sporocysts. 



21. Cyst from spleen of squeteague {Cynoscion regalis) (No, 5499, 

 U,S,N.M.) Woods Holl, IMassachusetts, July 27, 1887, 



This cyst was globular in sha])e and measured 15 mm, in diameter 

 while living, and 12,5 as an alcoholic specimen. It was not opened 

 until it had been in alcohol for sometime, when it was found to contain 

 coagulated i)arenchyma. but no trace of an embryo could be made out, 



22. Cysts from peritoneum of tlounder {Pitralivhtliys ohIon[/ns) (No, 

 5500, TJ.S,N.M,), Woods Holl, Massachusetts, August 29, 1887. Cysts 

 contained larval Rhynchoholhria; proboscides retracted, hooks of vari- 

 ous sizes and shai)es. Bears some resemblance to R. imparisjiine, but 

 scolex much sn)aller. 



