ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 67 



Kowalewsky's promised fm'tter information as to his extraordinary 

 Cceloplana, supposed to be intermediate between Ctenophora and. 

 DendroccBlida. The peculiar azygos character of the otolith in so 

 many Dendrocoelida may perhaps be explained by the similar con- 

 dition of the sense-organ in Cceloplana. 



Whether the second part of the work, dealing with the Dendro- 

 ccelida, will be published or not depends upon the extent to which 

 Dr. A. Lang's forthcoming work may cover the same ground. 



Dinophilus apatris.* — E. Korschelt gives a full description of 

 this new species of Turbellarian. After a short account of the 

 known species, and the characters of the new one, as drawn from 

 the female, he describes its habits, as observed in a marine 

 aquarium. The body is covered by an epidermis, which consists of 

 a layer of irregular polygonal cells ; there would appear to be no 

 rods, but, more especially in the young, we may see a number of small 

 rounded bodies, which have the same refractive index, and possibly 

 are comparable to them. From these cells there arise cilia, some of 

 which are shorter than the others ; the former are arranged in eight 

 regular rings, and of the latter two well-marked pairs are to be seen 

 at the anterior end of the head, with others on the tail and on the 

 dorsal surface. From their position we may justly assume their 

 tactile function. 



The expression body-space is expressly used for the purpose of 

 marking the difference between it and the body-cavity of the " Entero- 

 coelia " ; it is a wide cavity, such as is seen in no other Turbellarian, and 

 is traversed by only a few very fine connective bands, which arise 

 from the body-wall and are inserted into the intestine ; in the head 

 these are more numerous and completely fill up its anterior portion ; 

 the same is to be observed in the tail. Notwithstanding its apparent 

 differences it has really a very close resemblance to the ccslom of other 

 Platyhelminths. 



The ventral mouth forms a three-rayed cleft, placed near the 

 anterior end ; it is extraordinarily extensile, on account, probably, of 

 the great size of the protrusible proboscis ; the pharynx forms a 

 wide, richly ciliated cavity, and leads into the strong-walled crop ; 

 on either side lies a racemose " salivary " gland. The stomach only 

 opens to admit the nutrient balls, formed in the crop, and is much 

 less strongly ciliated than the parts in front of it. The rectum 

 and anus are richly ciliated. The proboscis consists of a solid, 

 not hollow, mass, and lies beneath the crop ; it is angulated in 

 the middle, and so appears to consist of two halves ; the anterior 

 portion is completely devoid of muscles, but in the hinder we find 

 circular fibres which are distinctly striated, and below them a layer 

 of less well developed longitudinal fibres. The author agrees with 

 Hallez in thinking that the function of this organ is to brush the 

 surface of plants to detach debris and diatoms, and that it does not, 

 as in some Turbellaria, seize on living animals. 



The eyes are well developed, and behind them, especially in 



* Zeitschr. f. Wiss. Zoo!., xxxvii. (1882) pp. 315-53 (2 pis.)- 



F 2 



