BY GERAKD KREFFT, ESQ., F.L.S. 226 



cylindrical in form, the smaller ends slightly rounded off, and con- 

 taining an S-shaped or roller-like granular body in the centre. 

 On a few occasions four raised lines were noticed in the middle 

 of these bodies, I am unable to say, however, whether they were 

 really spines or not. On Plate III., I have sketched three kinds 

 of ova, but all appear to be identical with one another, as a 

 reference to figs. 2, 6, and 16 will easily show. 



After another trial with tape worms the heads of which resemble 

 in shape, figs. 1, 4, 5, 15, and 16a of Plate III., I have obtained 

 nothing but ova as figured under No. 16, granular in the centre 

 and without hooks or spines, I cannot but conclude therefore 

 that my first view was correct, and that all the specimens figured 

 and mentioned above are identical. 



With regard to the proboscis it is no doubt retractile, and the 

 hooks may not always be visible, I certainly have seen them 

 occasionally, and have many dried specimens which show them 

 even in that state. 



Plate III., fig. 3, is no doubt an accidentally prolonged 

 jDroboscis, and figs. 8 and 8a may belong to a difierent species, 

 but I possess only a single dried preparation of it, and therefore 

 cannot ppply the ova test. Figs. 9, 10, 11, 12, 13, and 14, are 

 enlarged heads of immature specimens of the same Cestoid ; fig. 

 15a being about the natural size of one, and figs. 16d and 16c 

 show the manner (natural size and enlarged) in which the mature 

 proglottides have burst, no lemnisci being discoverable. Figs. 

 7 and 7a are representations enlarged and natural size, 

 respectively, of some of the few lemnisci-bearing specimens 

 noticed before, these organs are situated on one side only. 



The general form of the T. Bairdii is elegant, proportionate, 

 and seldom exceeding seven inches in length, the segments of the 

 " neck " are close together they soon widen out however, but 

 never attain a large size, and of the most posterior proglottides 

 it takes 45, to cover the space of half an inch. The lower mar- 

 gins are generally straight and the edges but slightly bulged out, 

 though now and then more bell-shaped and irregular-margined, 

 proglottides occur. 



The head is generally round without, or pear-shaped 

 with, a small proboscis ; four oval disks are indicated but are 



