ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 09 



Oxyures of Uromastix.*— L. G. Seurat has studied the minute 

 Oxyurids found in the caecum of this spiny-tailed lizard common on the 

 North American plateaux. One of them, Tkelandros alatus (= OxijHrU 

 uromasticola), is remarkable for the character of the " ovijector " which 

 expels one egg at a time. In another, Tachyiionetria vivipara, which is 

 only 2 mm. long in the male, 2-5 mm. in the female, only a few egi^^s 

 are developed in the uterus at one time. 



Platyhelminthes. 



Dendrouterina.f — 0. Fuhrmann, in reporting on some Cestodes 

 from birds of the Sudan and North Uganda, describes Dendrouterina 

 herodise g. et sp. u. from Herodias garzeWi. The scolex was awanting, 

 but there are remarkable peculiarities in the structure of the gonads, the 

 disposition of the musculature, and the details of the excretory system. 

 As the name suggests, the uterus is remarkable. It is horseshoe-shaped, 

 with very numerous lateral branches. 



Paralineus elisabethae.J — Victor Schiitz gives an account of the 

 minute structure of this Nemertine, which lives along with Linens 

 lacteus on the shore at Yille'franche, and has a deceptive resemblance to 

 it. It may be distinguished by the absence of eyes and cephalic slits 

 and by other minute features. It may be distinguished from Farapolia 

 by having swollen saccular cerebral organs, a spathula-like head end, 

 and no internal longitudinal muscle-layer in the proboscis. 



Incertse Sedis. 



Buddenbrockia.§ — Olaw Schroder returns to his previous account of 

 BuddenhrocTcla plumatellse, a peculiar parasite which he found in the 

 Polyzoon Phimatella. He is now inclined to regard it as a degenerate 

 Nematode, not as a Mesozoon as he previously suggested, nor as a Tre- 

 matode sporocyst as Braem suggested. There is well-developed nuiscu- 

 lature, probably mesodermic. The minute two-layered stages which he 

 describes in a previous paper are now regarded as due to inadequate 

 preservation. 



Rotatoria. 



Constancy of Elements in Hydatina.|| — E. Martini has followed up 

 his studies on Oikopleura and Fritillaria by a similar study of Hydatina 

 se?2ta. Throughout the whole body (with the possible exception of con- 

 nective-tissue) there is a remarkable constancy in the number and dis- 

 position of the elements. There are 959 cells (or better nuclei) and not 

 one of these can be absent or essentially different from what it is. 

 They occur as if on a plan, each with its typical shape, structure, and 

 function. Sometimes there is a remarkable constancy even beyond the 



* C.R. Soc. Biol. Paris, Ixxiii. (1912) pp. 223-6 (11 figs.). 



t SB. Akad. wiss. Wien, cxxi. (1912) pp. 181-92 (7 figs.). 



X Zeitschr. wiss. ZooL, cii. (1912) pp. 111-35 (2 pis. and 6 figs.). 



§ Zeitschr. wiss. Zool., cii. (1912) pp. 77-91 (2 pis. and 5 figs.). 



II Zeitschr. wiss. Zool., cii. (1912) pp. 425-645 (10 pis. and 24 figs.). 



