28 PROCEEDINGS OF THE NATIONAL MUSEUM, vol. 64. 



1903, 2 strobiles, with numerous free, ripe proglottides, were found 

 in the spiral valve of a dogfish. The ova in the ripe segments soon 

 became dark brown in sea water. The ova were in linear clusters, 

 usually 5 or 6 in the same capsule, and contained six-hooked 

 embryos. 



On 2 dates in May, 9 dogfish examined; few, with ripe proglot- 

 tides. 



On 5 dates in June, 9 dogfish examined ; 3 to IT, maximum length 

 135 mm. 



On 6 dates in July, 9 dogfish examined; 4 to 40, ripe proglottides 

 on one date. 



On 11 dates in August, 12 dogfish examined; 2 to 50, ripe proglot- 

 tides on 5 dates. 



On 4 dates in September, 5 dogfish examined ; 3 to 50, ripe proglot- 

 tides on 2 dates. 



1923, August 4 : about 12 in each of 3 dogfish. 



(U.S.N.M., Helm. Coll. 7681.) 



Squalus acanthias. 



Found in the spiral valve of the spiny dogfish, where it does not 

 appear to be a frequent guest. 



1904, June 6 : 1, length 115 mm. 



1910, July 29: 30, maximum length 76 mm., from one of nine 

 dogfish examined. 



1922, July 20 ; 31, collected by Dr. G. A. MacCallum. 



ACANTHOBOTHRIUM CORONATUM Rndolphi. 



Plate 4. figs. 33-35. 



1901, p. 481, fig. 293. 

 1911, p. 585. 



Prof. T. Southwell, to whom I had sent specimens of this species^ 

 remarks on its resemblance to Yoshida's A. ijimai}* 



It is a common parasite of the barndoor skate {Raja stahulifons)y 

 only a few, or often only one, in the spiral valve. 



Following are records of this cestode not before published : 



Raja stabuliforis. 



Collected in 10 of the years from 1903 to 1922, inclusive. 



On 3 dates in April : 3 skates ; 6 on each of two dates and 18, with 

 many fragments, on the other; maximum length 66 mm. 



On 5 dates in May : 5 skates ; 1 strobile with scolex on each date, 

 several fragments and scoleces with scolex niissing; maximum length 

 48 mm. ; length of last segment 1.20, breadth 1.12. 



"Parasitology, vol. 9, pp. 573-5, pi. 23, figs. 12, 13, text-fig. 1. 



