44 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol.64. 



deeply embedded within a space 10 mm. square. They were recorded 

 as Taenia^ species, with the comment that they suggested Taenia 

 gibhosa Leidy, from a species of Lamna of the Pacific coast of North 

 America. Since then I have examined hammerhead sharks at Woods 

 Hole on nine different dates and have found these cestodes on two 

 of those dates. 

 ry7?e.— U.S.N.M., Helm. Coll. 7693. 



Cestracion zygaena. 



1908, August 3: 11, not in good condition, being in some cases 

 partly macerated. The length of the longest specimen was 70 mm. ; 

 diameter of scolex 0.56, of bothrium 0.21 ; length of ripe proglottides 

 4.5, breadth 1.5; eggs large, smoky-brown, 0.21 by 0.14. 



1914, August 7 : On this date the spiral valve of a 180-centimeter 

 hammerhead was examined; crystalline lenses and spermathecae of 

 squid were found, and four species of cestodes, among them 10 

 specimens of this cestode. The maximum length was 75 mm. These 

 worms were firmly attached to the mucous membrane. In many 

 cases the scoleces were so deeply embedded that it was necessary to 

 dissect them out in order to secure unbroken specimens. Around 

 the point of attachment some infiltrated blood was noted. There 

 seemed to be a faint patch of red pigment in the neck a short dis- 

 tance back of the scolex. 



Gale-US glaucus, 



1923, July 23: 8, all firmly fixed to the mucous membrane of the 

 spiral valve, which was slightly inflamed, and probably ulcerated at 

 the points of attachment; length 41 mm., maximum breadth 1.4 

 mm.; densely beset with fine, short, evanescent spines, length about 

 0.024 mm. 



Although several figures were published in the original report on 

 this cestode, the written description was brief, and contained only 

 data recorded at the time the collection was made. A more detailed 

 description than that already published is therefore called for. 



The Scolex is subglobular, with the bothria directed forward. The 

 proglottides do not appear immediately behind the scolex. The 

 general habit of the strobile is linear, but the breadth increases 

 rather uniformly. Adult proglottides are longer than broad, and 

 have the angles more or less rounded. Free, ripe proglottides may 

 be three or more times as long as broad. The genital pores are 

 irregularly alternate and situated at about the anterior third of the 

 margin. A characteristic feature of ripe proglottides is the rela- 

 tively large ova, which are nearly spherical and have thick shells. 

 The dimensions which were given in the original description were 

 of living material which had been washed in fresh water, and was 

 consequently more or less turgid, hence the diameter of the scolex 



