PROGRESS OF MICROSCOPICAL SCIENCE. 91 



pus ruhricornis, Byhlis Gaimardi, and a species of Ampelisca. In all 

 these except tlie last two a very large proportion of the gland is in the 

 basal segment. In the AmpJiitJioe this segment is thickened and the 

 gland is in the middle. In the Cerapus it is very broad and almost 

 entirely filled by the gland, with only very slender muscles through 

 the middle, and the orifice in the dactylus is not at the very tip, but 

 sub-terminal on the posterior side. In the Ptiloclieirus the gland forms 

 three longitudinal masses in the basal segment and is also largely 

 developed in the meral and carpal segments. The dactylus is long 

 and slender and the orifice sub-terminal. In AmpeUsca and Byhlis 

 (which, like Haploops, are tube-building genera) the meral segments 

 of the specialized legs are nearly as large as the basal, and contain a 

 proportionally large part of the gland. In these genera the remark- 

 able elongation of the two distal segments in the thii'd and fourth 

 pairs of legs is perhaps a special adaptation to enable them to reach 

 back over the deep epimera. 



Retrogression of tlie Graafian Follicle. — M. Slavjansky has re- 

 cently written a paper in the ' Archives de Physiologic,' which is 

 thus abstracted in the ' Medical Record,' June 15th : — " 1. The 

 Graafian follicles are developed from the primordial follicles, and 

 acquire a greater or less degree of maturity during the whole of life, 

 from the first month after birth till about the age of 40. 2. The 

 greater part of the follicles are not ripe, do not burst, and do not 

 discharge their contents, but undergo atresia, presenting an almost 

 complete analogy with that of the formation of the corjjora lutea. 

 3. The development and maturation of the Graafian follicles are not 

 produced periodically in a regular manner, and no connection exists 

 between them and menstruation. 4. Menstruation constitutes a 

 physiological phenomenon, quite independent of the development and 

 maturation of the follicles. 5. The rupture of follicles more or less 

 mature always bears a certain relation to congestions of the genital 

 organs, produced by any cause whatever. 6. There exist certain 

 maladies (ague, poisonings, &c.) which j^roduce atresia of the follicles 

 at different periods of their developments, after a parenchymatous 

 inflammation of the ovary." 



Uie Termination of Nerves in the Lips. — Dr. Pallidino {Bull. delV 

 Assoc, del Natural di Napoli) states that in the lijis of the horse, which 

 are richly supplied with nerves, many isolated, nou-medullated fibres 

 run from the subcutaneous connective tissue into the deeper layers of 

 the epithelium, when they have a straight course and terminate by 

 free extremities after they have traversed the deepest layer of the 

 pavement epithelium, occasionally exhibiting a terminal dilatation or 

 enlargement, Pallidino has not been able to discover any connection 

 of the nerve fibres with peculiar stellate cells of the rete Malpighii, as 

 described a year or two ago by Langerhaus. 



Distinction hetween Mammalian and Reptilian Blood. — The ' Ame- 

 rican Journal of Medical Sciences ' says that Dr. R. M. Bertolet, M.D., 

 Microscopist to the Philadelphia Hospital, refers to the great difficulty 



VOL. XII. H 



