NO TKS OX ( 'AL YPTROBOTIIR 1 1 '.1/— ! ANTON. 



283 



FlH. 7. — CALYl'TUiiHdTllKIUM MINUS. 



Young scolex; sketch made from 

 LIFE. Actual length of bothrium 



0.7 MM. 



One strobile, which measured 42 mm. in sea water shrunk to 24 mm. 

 in T<> per cent alcohol, and another shrunk from t^{) nnn. to 30 mm. 



August 7. — This torpedo was taken at Menemsha Bight on August 3, 

 and kept in the aquarium until the 6th, when the spiral valve was 

 removed and kept on ice until the 7th, The tapeworms were found 

 to be still alive and remained moderately active for some time in sea 

 water. Placed in TO per cent alcohol they 

 contracted strongly, for example, from 30 

 mm. to 20 nnu. and from 55 mm. to 30 mm. 

 August 7. — No scoleces nor strobiles 

 were obtained, but a few minute, active 

 bodies were found in the spiral valvr 

 which looked like very small specimens 

 of Scolex poJiintoi'pliu^ until they were 



examined with a 



lens (tig. 8). Upon 



l)eing magnified 



r they were seen 



/ to be fragments 



,' of the 3'oung of 



y this species. The 



; anterior end for 



not (piito half the length was armed with 

 minute bristles; the posterior end, for a little 

 more than half the length, with minute serra- 

 tions. The length was about 0.8 mm., the 

 breadth 0.28 mm. One was seen with the 

 rudiments of reproductive organs. 



Auguxt 9. — Free, ripe segments were found 

 with this lot. 



August 10. — A large number of ripe seg- 

 ments were found in this lot. 



August 1'2. — Al)out 12 strobiles of this spe- 

 cies were found in each of the two torpedoes 

 with an enormous number of free and ripe 

 segments. The latter were most abundant in 

 the torpedo in which none of the larger spe- 

 cies {C. occiden(ale) were found. The free 

 segments are capable of making progres.sive 

 movements, during which the anterior end is elongated so as to 

 resemble the neck of certain distomes. The resemblance is heightened 

 by the almost constant presence of a rounded knob at the anterior end. 

 The surface of the joint is slightly roughened by very minute serra- 

 tions which project posteriorly, so that the spasmodic contractions of 

 the body, aided by a kind of tiowing peristalsis, constantly propel the 

 seo-ment forward, I did not observe t' le anterior end acting as a sucker. 



Fig. S. — Calyptrobothriu.^i 

 MiNU.*. Fragment of stro- 

 bile, young; sketched fro.m 

 LIFE. Actual length O.S MM.; 

 breadth 0.28 MM. 



