ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
795 
genus, which has no foot, but has a carapace, has certain points of resem- 
blance to Gastroschiza and may be called Anapus (A. ovalis sp. n.). 
Proales.* * * § - — Mr. P. G. Thompson has some notes of observations on 
the quasi-parasitic habits of members of this genus of Rotifers, and de- 
scribes a new species, P. daphnicola, which he found in a pond at 
Leytonstone, Essex, roaming about on the body of Daphnia pulex ; it 
appears to be allied to, though not identical with, Plate’s Furcularia 
Gammari. 
New Rotifer. f — Mr. J. C. Thompson describes, in the middle of 
Prof. Herdman’s general report on the results of the cruise of the c Argo ’ 
to Norway in 1891, where it is very likely to be overlooked, Anursea 
cruciformis sp. n., taken in the Bukken Fjord. The lorica is so tesselated 
as to show a cruciform marking, and is divided into six nearly equal 
portions. 
Macrotrachelous Callidinse.J — Mr. D. Bryce thinks there is no 
doubt that Callidina constricta, G. Widens , C. musculosa and G. reclusa 
must be added to the ten species allowed to belong to the genus 
Gallidina. In all, indeed, he knows of twenty-one, four of which he 
describes in the present paper, and of those nineteen are British. The 
macrotrachelous forms are those in which, when fully extended, the post- 
anal portion is decidedly shorter than the pre-intestinal ; most live on 
the stems, leaves, or bracts of various mosses. The author recommends 
the student to pay special attention to the trochal discs, the shape of 
the rami and the number of their teeth, and the spurs, which are very 
distinctive, among other points. The new species receive the names 
of G. plicata , G. lata , G. spinosa, and G. aspera ; they were found in 
Epping Forest, Folkestone, and the Isle of Wight. 
Ecbinodermata. 
Cuvierian Organs of Holothuria nigra.§ — Mr. E. A. Minchin cor- 
rects certain errors in Bell’s descriptions of these organs, which appear 
to him to be due to the fact that spirit specimens only were examined. 
The organs do not, as has been stated, arise from the cloaca and they 
are not closely united into a firm bundle ; if the organs are placed in 
spirit they adhere to one another and to everything they touch, so that 
in spirit specimens perfectly misleading appearances are obtained. In 
fresh specimens the organs are seen to be quite separate from one 
another and to arise independently from the left respiratory tree. A 
healthy animal always contains an enormous number of tubes and they 
take up a very large space in the body. 
The most curious property of these organs is their power to elongate 
to a relatively enormous extent. When the threads are first ejected 
there is at the end of each a thicker portion or head, which is easily 
seen to be the cause of the movement. “ One might compare the head 
to a rocket, and the thread to the trail of sparks emitted by it.” As the 
head is generally slightly curved it runs in any direction, and, as a 
* Science Gossip, 1892, pp. 219-21 (1 fig.), 
t Trans. Liverp. Biol. Soc., vi. (1892) pp. 77-81. 
i Journ. Quek. Micr. Club, v. (1892) pp. 15-23 (1 pi.). 
§ Ann. and Mag. Nat. Hist., x. (1892) pp. 273-84 (1 pi.). 
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