ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 65 



species diagnosis, seeks to place the classification upon a firmer basis. 

 He gives a revised diagnosis of Myzostoma asterm Marens, a form which, 

 on account of its strictly endoparasitic mode of life within the arms of 

 certain star-fishes, is of special interest. This is followed by a detailed 

 account of its anatomy and minute structure. 



Platyhelminth.es. 



New Species of Phagocata Ledy.* — Gr. Chichakoff has found near 

 Mount Vitocha, in company with Planar ia alpina, a Turbellarian which 

 appears to differ from this species in one character only, viz. in possess- 

 ing a multiple pharynx. This character classes it in the genus Phagocata, 

 of which there has hitherto been known a single species, P. gracilis. 

 The new species, however, differs from P. gracilis, not only in the 

 general form of the body, but also in certain internal characters. 

 Reasons are adduced for believing that the genus has had a teratological 

 origin from Planar ia alpina. The new species he terms Phagocata 

 cornuta. 



Incertee Sedis. 



Gonads of Phoronis.f — Iwaji Ikeda gives a concise account of the 

 development of the sexual organs and of their products in Phoronis. 

 In young individuals, he says, sexual organs are not found, but in their 

 stead there exist csecal capillaries which, by the modification of the peri- 

 toneal layer, give rise to the gonads. As sexual maturity approaches, 

 the peritoneum becomes thickened and forms a pyramidal layer. This 

 layer is called the nutritive layer, because it contains reserve nutriment 

 in the form of spheres. Immediately below this layer a few scattered 

 peritoneal cells lie which give rise, by proliferation, to the germinal cells. 



In the ovary the oogonia soon differentiate into oocytes and follicular 

 cells. These cells absorb the nutritive layer in their growth, and then 

 the follicular layer becames a mere membrane when the egg approaches 

 maturity. In the testis the same development takes place, but the 

 characteristic feature is the pushing out of fibrous bundles, by the con- 

 nective tissue layer, round which the spermatogonia arrange themselves. 



Rotifera. 



New Species of Philodina.J — David Bryce figures and describes 

 two new species, Philodina nemoralis and Ph. rugosa, with two varieties 

 of the latter, found on mosses growing in damp ground, or on sphagnum 

 in mossy pools, and also gives some general details about the structure 

 of the foot and toes of the animals belonging to this genus. 



New Male Rotifers.§ — To the long list of male Rotifers now 

 known, K. I. Marks and W. Wesche add those of Brachionus quadratus, 

 Anuroza brevispina, and Pterodina patina, figures and description of 

 which are given. 



Variation Cycle of Anursea cochlearis.|| — Three years ago Robert 

 Lauterborn published If the first part of his study of the cycle of 



* Arch. Zool. Exp., 1903, pp. 401-9 (1 pi.). 



t Annot. Zool. Japoii, iv. (1903) pp. 141-53 (1 pi.). 



t Journ. Quekett Micr. Club, viii. (1903) pp. 523-30 (I pi.). 



§ Tom. cit., pp. 505-12 (1 pi.). 



I Verh. Naturhist.-Med. Ver. Heidelberg., Bd. vii. 4 (1903) pp. 52»-621. 



t Cf. this Journal, 1901, p. 159. 



Feb. 17th, 1904 f 



