ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 787 



round Leipzig and Halle ; near Berlin every second stickleback had 

 its young tape-worm. 



The complex sexual organs of Schistocephalus are here made 

 intelligible by very clear figures. Why Ligula, as Leuckart has 

 already shown, should differ, bird-wise, in having but one ovary, is 

 not easily explained. In other respects the genitalia of the two 

 worms are very similar. Herr Kiessling insists that there is not a 

 fusion of two ovaries into one, as stated by Biehm to occur occasion- 

 ally with Taenia rhopalocephala. 



New Floscalaria.* — Dr. C. T. Hudson describes a new Floscu- 

 laria (F. regalis), found by Mr. T. Bolton, on Myriophyllum in a 

 pond near Birmingham, which also bore specimens of F. campanulata, 

 F. ambigua (also one of Mr. Bolton's discoveries), F. coronetta, and 

 F. ornata. 



The new rotifer has a nearly circular cup-shaped disk, the edge 

 of which bears six slightly recurved processes ending in knobs 

 covered with long radiating setae. The processes taper from their 

 bases up to the knobs, and are set at regular distances round the 

 cup, giving the rim quite a hexagonal appearance. The two pro- 

 cesses which are nearest to the dorsal surface are shorter than the 

 others, and between them rises a triangular lobe longer than any of 

 the processes, and also crowned with a setse-bearing knob. The disk 

 is thus a kind of cross between that of F. coronetta and F. ornata, 

 only with this hitherto unique distinction, viz. that there are seven 

 processes issuing from it. All the previously known floscules have 

 either five or three such processes ; and there is only one known 

 species that has the latter number, Mr. Hood's F. trifolium. Ehren- 

 berg's six-lobed F. proboscidea is no doubt the five-lobed F. cam- 

 panulata. 



F. regalis is not one of the larger species. The majority of those 

 hitherto seen were about ■£§ of an inch, and the largest was ^ ff . 

 The smaller, and probably younger, ones were unusually transparent 

 for floscules. The two eyes were readily found on the dorsal side, 

 both by direct and by dark ground illumination. Dr. Hudson was 

 surprised, also, to find how easy it was to see the semicircle of 

 small cilia which lies at the bottom of the cup on the ventral side. 

 In the majority of the other species these are extremely difficult to 

 make out. On the other hand, the tube of the new floscule was in 

 every instance almost invisible. Its existence could just be made 

 out, but that was all. No great stress ought, however, to be laid on 

 this, as the tubes of all species vary very much according to their 

 habitat. When fully expanded it usually extends outwards all the 

 six linear processes, but curves inward the seventh triangular one 

 over the cup-shaped disk, and uses both it and its seta? to prevent the 

 escape of its prey. 



Desiccation of Rotifers. — The Bev. Lord S. G. Osborne referring 

 to a previous letter of Mr. Jabez Hogg as to the Botifers and Amoeboz 



* Midi. Natural., v. (1882) p. 252. 



