282 



PROCEEDTNCIS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



The 



in the 

 The 



entire strobile has a tendency to become fusiform when placed 



killino' fluid, in which it contracts strongly. 



general plan of the anatomy of a mature sejjjment is like that of 

 O, occidentale. The vitellaria are proportionately less 

 voluminous and the lobes of the testes are, perhaps, rela- 

 tively larger. The cirrus, which was seen everted, is 

 provided with a basal bulb and is spinose. The shell 

 gland is placed a little farther back in relation to the 

 ovary than in C. occidentale^ although this may be a 

 character incident to the greater maturity of the seg- 

 ments. 



Maximum length 50 mm., breadth 0.5 mm. 

 Diameter of head of mounted specimen 0.6 mm., of 

 neck 0.22 mm. 



NOTES ON C. 



MINUS, MADE AT THE 

 LECTINS. 



TIME OF COL- 



./ 



JuJy '27. — Approximately 100 specimens were taken 

 from a spiral valve, which had been lying for two days 

 in 5 per cent formalin. 



While collecting these specimens from a dish of sea 

 water in which the material had been washed, a living 

 scolex was found by Mr. Carl D. Sawyer. The speci- 

 men was, without doubt, alive, and it remained living 

 and active for some minutes after my attention was 

 called to it. Fig. T is from a sketch made of this scolex 

 after it had come to rest. No other living specimens 

 were found in the dish. The length of a single both- 

 rium at rest was 0.7 mm. I can not account for the 

 presence of this living scolex in the dish. It seems to 

 me incredible that it came from the intestine of the 

 torpedo, which had been in a jar of 5 per cent formalin 

 for two days. 



August Jt-. — Many were found in the spiral valve. 

 The heads, as usual with this species, were, for the 

 most part, firmly embedded in the mucous membrane 

 of the host. Unless care is taken the heads ma\^ ver}' 

 easily be lost. Man}^ mature, free segments were found 

 in this lot, with the mass of ova showing as a dark 

 l)rown spot. The mature segments evidentl}^ increase 

 in size after separating from the strobile. The pos- 

 terior segments of the strobile separate easily while 

 ihey are still nuich smaller than the ripe segments. 

 The posterior portion of a strobile with maturing segments is usually 

 moniliform. The last segment is often tapering at its posterior end. 

 There is some variation in the size of the fusiform ova; the largest 

 were about 0.17 mm. in lenoth and 0.017 mm. in diameter. 



Fig. 6.— Calyptro- 

 bothrium minus. 

 Ova; sketched 

 FROM LIFE. Ac- 

 tual LENGTH OF 

 ONE O.IG MM., DI- 

 AMETER 0.02 MM 



