NO. 1529. 



NOTES ON CALYPTROBOrilJlirM— LINTON. 



279 



/ 



1^ 



An abnormal segment was found in this lot which 1 have made the 

 subject of a special paper." 



This is a case of reduplication and reversal of parts. There are two 

 complete sets of genital organs. The two cloacal apertures are on the 

 same lateral margin. The ovaries are at opposite .ends and the 

 testes make a central mass common to both components. The double 

 segment is -t mm. in length and 2 mm. in breadth. 



In this lot some of the 

 strobiles contracted in a re- -— ^ 



markable fashion, so as to 

 resemble specimens of turi.- 

 ing as seen in table legs and 

 the like. 



AiKjuxt IS. — Material in 

 formalin. One small speci- 

 men had contracted so as to 

 resem])le the large form. 

 The free segments re- 

 sembled C. minus., the sco- 

 lex and fragments re- 

 sembled (J. occidental e. It 

 was the occurrence of phe- 

 nomena like these, observed 

 in the single lot of speci- 

 mens upon which the orig- 

 inal description of the spe- 

 cies was based, which led me 

 to regard the two forms as 

 varieties of the same species. 



August 18. — Material in 

 formalin. The four speci- 

 mens were in poor condition; one was quite flaccid and measured -ilO 

 mm. in length. 



August 19. — The single large specimen was of a faint pink color. 



August 22. — Several fragments were found, but no free segments. 

 One small specimen with thick neck, apparently a young scolex of this 

 species. 



CALYPTROBOTHRIUM MINUS, new species. 



Cahjptrohotliriinn occideiitale Linton (part), Bull. U. S. Fish Coinm. for 1899, 

 pp. 298-299, pi. xiA, figs. 92, 93, 96. 



Head truncate, axial portion not conspicuously thickened; bothria 

 in pairs, prominent, very flexible in life, the anterior ends with the 

 relatively large sucker characteristic of the genus, the posterior ends 

 slender and tapering. Neck slender, much smaller than head, with 



I 



I 



Fig. 3. — Calyptrobothriitm mint's. Scolex; 

 made from specimen mounted in balsam, 

 diameier of neck 0.'12 mm. 



SKETCH 



Actual 



Biological Bulletin, XII, pp. 155-157, fig. 1. 



