ZOOLOGY AND BOTANY, MICEOSOOPY, ETC. 963 



A brief account is then given of the eyes of Vorticeros auriculatum, and 

 Enterostoma striatum; in the latter the pigment-capsule contains two 

 spherical structures, which, in well-preserved examples, exhibit a distinct 

 longitudinal striation, due to the presence of extremely delicate bacilli, 

 enclosed in a delicate intermediate substance. In these two forms lenti- 

 cular cells are probably present. 



In Plagiostoma Girardi, the contents of the pigment-capsule consists of 

 two distinct substances ; the larger hinder part of the cup is filled by a 

 completely homogeneous substance which is only faintly stained by 

 reagents ; in front of it is a delicate band which is not coloured, but has no 

 distinct horizontal striation. In front of the pigment-capsule is a group of 

 cells, of which the central are larger than the peripheral. The structure 

 regarded by Graff as the lens, consists of the contracted contents of the 

 pigment-capsule which ought to be considered as the nerve-end apparatus. 



The subcutaneous nerve-plexus, which, according to Lang and Ijima, 

 is most apparent on the dorsal surface of Planarians, is to be seen in 

 P. gonocephala, where it is best developed in the cephalic and auricular 

 portions, and connected with it is an apparatus developed on the auriculfe, 

 which may be regarded as an end-organ. On the dorsal surface of these 

 processes there are small pits with a sharp and fine contour ; at the base 

 numerous nerve-fibres enter the pits from the subcutaneous plexus, and 

 pass to a reniform body which fills the median third of the depression ; 

 this body is fibrous in structure, and! from its free surface there project a 

 number of thick round sette, provided at their free ends with small capitula. 

 The author suggests that the function of these organs is tactile. 



Planaria Iheringii.* — Dr. L. Bohmig gives a general account of a 

 new tricladid Planarian from Brazil. The worms are from 3 '6-5 mm. 

 long, 2-3 mm. broad, and 0*05 to 0-75 mm. thick. The ground-colour is 

 bright yellowish-brown, or dirty whitish-yellow. At the edge of the head 

 there are two whitish spots which project slightly beyond the margin of 

 the body, and are the auricular processes. In the hinder third of the body 

 are two orifi.ces, one of which is the oral and the other the genital ; the 

 former leads to a pharynx, which, when completely protruded, is 1 • 4 mm. 

 long ; the latter to a narrow cleft which opens into a space largely occupied 

 by the muscular penis ; this space is the atrium genitale, and into it there 

 oj)en the vasa deferentia. The saccular uterus is of some size, and lies 

 between the wall of the atrium and that of the pharyngeal space ; its duct 

 is provided with a highly developed musculature, and the two oviducts 

 open separately into it. The paired germaria lie at about • 8 mm. from 

 the anterior pole of the body, while the vitellaria and testes lie in front of 

 and behind the copulatory apj)aratus. The structure of the generative 

 apparatus of this new species is of the type found in Planaria jpolychroa. 



GraflBUa Brauni.t — Herr F. Schmidt has discovered a fourth species of 

 Graffilla, which he calls G. Brauni ; it lives parasitically, and apparently 

 abundantly, in Teredo ; the largest specimens are from 2*5 to 3*2 mm. 

 long, and about 1 mm. broad ; the colour is generally whitish yellow. 

 The protoplasm of the epithelial cells is, as in G. muricicola, finally striated ; 

 no rhabdites were observed ; the dermomuscular tube is fully developed, 

 The meshwork which forms the supporting substance of the body- 

 parenchyma is extraordinarily fine, so that with low powers, the parenchyma 

 has almost the appearance of a completely homogeneous mass. The new 



* Zool. Anzeig., x. (1887) pp. 482-4. 



t Arch. f. Naturgesch., lii. (1887) pp. 304-18 (2 pie.). 



