320 Miscellaneous. 



vering in Chernes an apparatus which much bettei- fulfils the 

 requirements of a spinning-organ. Thus in the cephalothorax, 

 above the brain and the anterior hepatic lobes, there are two 

 considerable glandular masses whicli touch each other in the 

 median line, and with their much attenuated anterior ends 

 enter the basal joint of tlie chelicerfe. The glands themselves 

 consist, on each side, of four or five cylindrical closely ap- 

 proximated tubes which contain granular cells grouped around 

 a clear central canal ; the chelicerge receive only the narrow, 

 chitinized efferent ducts, forming a fine bundle, which may be 

 traced through the basal joint into the movable finger of tlie 

 chela, traverses this, and enters into a soft-skinned process at 

 its apex, which is characteristic of the genera Chernes^ Ghe- 

 lifer^ and Cheiridium. This process in Chernes terminates in 

 four short conical points into which the ducts may be traced 

 singly, and in which they probably open by a fine aperture, 

 which, however, I have not been able to see distinctly. I 

 found the same arrangement also in Chelifer. The structure 

 of the chelicera itself also seems to support my interpretation, 

 seeing that a number of processes exist upon it, and seem 

 perfectly fitted for pulling and arranging the threads. Along 

 the inferior surface of the movable finger there is a long- 

 comb consisting, in G. Hahnii^ of eighteen plates ; whilst on 

 the immovable arm of tlie chela there is inserted a serrated 

 and denticulated process, at the base of which rises a semi- 

 circular fold of skin. 



MISCELLANEOUS. 



On ihe Structure of the Muscular Fibres of some Annelids. 



By M. JOTJRDAN. 



The author has made a special study of the muscles of the in- 

 teguments of the following Annelids : — Hermione hijstrix, Kbg. : 

 Polynoe Gruhiana, Clap. ; 'Eunice torquata, Gr. ; Si/llis sponjicola, 

 Gr. ; PJiyllodoce Paneti, Bl. ; Siphonostoina diplocluhtos, Otto ; 

 Terehella IlecJcclii, D. C. ; Sabellaria cdveolata. Lam. ; and Protula 

 intestinum, Lam. 



The form of the muscular fibres varies between rather wide limits, 

 but they may be referred to two types — some are nearly cylindrical, 

 others distinctly lamellar. But there is an intermediate series of 

 more or less ribbon-like elements. The muscular fibres are some- 

 times fusiform and short, when they are visible throughout their 

 whole extent in the field of the microscope ; in other cases they 



