71)2 LARVAL CESTODE PARASITES OF FISHES— LIXTOX. 



These larv.T appear to belong to the genus Echeneihothrinm. 



Although found in su(;h great jiuuibera and so often, especially in the 

 Squeteague, I am not disj^sed to think that any of the fish in which I 

 have found these interesting forms is either the true intermediate or 

 the ]>r()per final host of the si)ecies. 



It is likely that difiereiit s])ecies ;ire rei)reseuted among these larvne. 



4. PHYLLOBOTHRIUM LOLIGINIS. 



(Plate II, ligs. 1-y.) 



Taenia loliginis, Leii>y, I'roc. Acad. Nat. Sci. Phila., ]<S87, ]>. 21. 



Ti'trabothrium or I'Iiylli>hiit}n-iiim lolifi'mis, Jazidy. I'roc. Acad. Nat. Sci. Phila., 18!tO, 

 p. 418. 



From stomach of s(j[uid [Ommasirephi's illecchrosus). Collected at 

 Woods Holl, Massachusetts. The squids were taken at Provincetown, 

 Massachusetts (No. 4S01, IT.S.N.]M.). 



The living specimens attained a length of over 20 mm.; head and 

 neck a delicate i^iuk or fiesh color and subtransparent; body ivory 

 white, less transparent than head and neck, and with denser retractile 

 granules. Bothria four, very variable, Avith crum])led or folded l)order, 

 each with an auxiliary acetabulum, a terminal papillary eminence 

 (myzorhynchus), with fine radiating fibers. Dimensicms of one of the 

 larger specimens in millimeters, somewhat compressed: Length, 18; 

 breadth of head, 5; breadth of neck, 3.."). 



The bothria are very extensible, sometimes elongated, at other times 

 contracted, again spread out into a large flat disk and applied to the 

 bottom of the dish and used in locomotion (fig. 3). The lateral ves- 

 sels show i)lainly through the transparent walls of the head and neck 

 and can be traced to the posterior end of the body. The body becomes 

 wider than the neck, is flat, and tapers to a point behind. 



The alcoholic specimens are corrugated and puckered. 



Dimensions of one of the larger alcoholic specimens : Length, 14 mm. ; 

 diameter of head, l.a; breadth of neck, 0.7; greatest breadth of body, 

 1.1'. 



The smallest specimens in the lor are only l.'J:~* mm. in length. 



5. THYSANOCEPHALUM sp. (Larva). 

 (Plate II, figs. 10-11.) 



One small si)ecimeu, 1 mm. in length, from the stomach of the squid 

 {Om)H((sfrq)hes illecchrosus). Collected, August 28, 1886, at Woods 

 Holl, IMassachusetts. The squids were caught at Provincetown, Massa- 

 chusetts (No. 4815, U.S.N.M.). 



The specimen is the young of my genus T/n/sanocephahim, and i)re- 

 sumably of the species T. crisjnou.^ 



Only the scolex present. 



'U.S. Fish Com. Kept., 188«, pp. 513-551), pis. lxi-lxvii. 



