ZOOLOGY AND BOTANY, MICllOSCOPY, ETC. 185 



hammer- shaped hooks. Suckers armed or unarmed. A singula set of 

 reproductive organs in each segment. Genital pores unilateral or alter- 

 nating. Uterus persistent or transient : in the latter case the eggs 

 either enclosed in egg-capsules or scattered throughout the parenchyma. 

 Eggs with thin transparent shells. Adults in mammals or birds. Larval 

 stage a cysticercoid in molluscs or insects. J. A. T. 



Extract of Tapeworm. — J. Parisot and P. Simonin {Comptes 

 Rendus ScL Biol, 1920, 83, 937-9, 939-41). Aqueous extracts of 

 the whole of Taenia saginata injected into the rabbit show relatively 

 marked toxicity, and bring about fatal circulatory and respiratory dis- 

 orders. A very specific effect is seen in the wall of the intestine, and 

 the histological changes are described. There is also abundant diarrhoea. 



J. A. T. 



Incertae Sedis. 



Minute Structure of Tardigrada. — H. Baumann {Zool. Anzeig., 

 1920. 52, 56-66, 5 figs.). Studies of JIacrohiotus, Hypsihius, Echiniscus 

 and 3Iilnesium, with reference to the spermatozoa (remarkable in show- 

 ing in immature stages a locomotor process from each end of a bent 

 spindle-shaped cell), the buccal apparatus with its musculature and 

 stilets, the pharynx with a characteristic disposition of the nuclei in the 

 component cells (there is a purely convergent resemblance to the 

 Nematode pharynx). It is interesting to find that the number of cells 

 in the pliarynx seems to be constant in Macrohiotus hufelandi, Hypsihius 

 and Echiniscus ; but in Milnesium the number is much greater. 



J. A. T. 



Remarkable New Species of Porocephalus. — W. N. F. Woodland 

 [Parasitology, 1920, 12, 337-40, 1 fig.). From the intestine of a 

 Nigerian cobra two specimens were obtained of a remarkable form, 

 Porocephalus pomeroyi sp. n., approaching P. annulatus, but with a very 

 long narrow " neck," and with the prosoma roughly three times longer 

 than it is broad, and the first annulus at least twice the size of the thii'd 

 or any succeeding annulus. The specimens represented the two sexes. 

 The white cylindrical body is divided into a large prosoma, a long 

 narrow neck, and a long annulated opisthosoma. The female was 

 64 mm. long, the male 12 mm. The prosoma of the female was 8 mm. 

 long and sac-shaped ; the neck was 7 mm. long and only 0*8 mm. 

 in breadth. Thus the total appearance of the animal is very curious. 

 The two specimens were found in sexual union. J. A. T. 



Ccelentera. 



Hydra oxycnida. — Ed. Boeckbr {Zool. Anzeig., 1921, 52, 97-100, 

 2 figs.). This species, apparently very rare, was established by 

 P. Schulze for a form of notable length and with a polar pointing of the 

 large pear-shaped cnidoblasts (penetrants). Boecker obtained a number 

 of specimens at Wittenberg on the Elbe. They were 18-20 mm. in 

 length apart from the tentacles, and very slender. The 6-11 tentacles 







