ZOOLOGY AND BOTANY^ MICROSCOPY, ETC. 577 



from Quito, Ecuador. Some specimens in the British and Copenhagen 

 Museums cannot be specifically determined. The author has some 

 doubts as to the locality of the species described by Horst from Sumatra 

 (P. sumatrantis), as it has a number of the characters of Neotropical 

 species. 



Anatomy of Peripatus capensis and P. novae Zealandise.* — Miss L. 

 Sheldon has some notes on the points in which these two species differ 

 from P. edwardsii. P. capensis always seems to have crural glands in all 

 but the first pair of legs ; in P. novse Zealandise they seem to be quite 

 wanting, while in P. edwardsii they are found on some of the legs of the 

 male. In P. novse Zealandise the external aperture of the generative 

 apparatus is placed on the ventral surface of the body in front of the 

 last pair of legs, and there are no segmental organs in this pair; in 

 P. capensis the generative aperture is placed at the posterior end of the 

 body, and the last pair of legs has segmental organs. In P. novse 

 Zealandise the accessory glandular tubes lie more laterally in the body 

 than in P. capensis, and they also differ in opening quite independently 

 of the vas deferens. This duct is much shorter in P. capensis than in 

 P. novse Zealandise; and this difference appears to be due to the very great 

 difference between the spermatophores of the two species ; in P. novse 

 Zealandise the duct very closely resembles that of P. edwardsii. The 

 ovarian funnel described in P. edwardsii is not found in the New Zealand 

 species. 



c. Crustacea. 



Intercoxal Lobe of certain Crayfishes.f — Mr. W. J. Mackay has ex- 

 amined certain appendages connected with the branchisB of Astacopsis 

 Franklinii, which have been figured but not described by Prof. Huxley. 

 These bodies, which may be called the intercoxal lobes, have the upper 

 portion of the anterior face attached to the arthrodial membrane, while the 

 lower surface of the anterior face is attached to the base of the coxopodite, 

 which is smooth and convex. The lower portion of the surface first 

 exposed when the base of the podobranch is removed, is covered with 

 setae which project prominently from its surface ; the anterior face is 

 concave, and is so well able to fit on the convex base of the coxopodite. 

 The whole arrangement is such as to lead us to suppose that the inter- 

 coxal lobe acts as a valve between the thoracic limbs and the branchio- 

 stegite, and prevents the too ready entrance of foreign bodies. In Astacus 

 fluviatilis the only representative of this lobe is a small hard ridge on 

 the arthrodial membrane of the fourth pair of legs ; in Homarus vulgaris 

 the lobes occur in the limbs of the 9th to the 13th segments. No repre- 

 sentative of this structure was found in any anomurous or brachyurous 

 crustacean which was examined. 



Development of Alplieus.| — Mr. F. H. Herrick has been able to 

 make a complete study of the development of Alpheus. He has been 

 convinced that the germinal layers in the early stages of development 

 have not the significance which is usually assigned to them. " The mass 

 of cells which results from gastrulation, some of which are poured into 

 the yolk, is an unspecialized indifferent layer, and cannot be regarded 



* Quart, Journ. Micr. Sci., xxviii. (1888) pp. 495-9. 

 t Proc. Linn. Soc. N. S. Wales, ii. (1888) pp. 967-9. 

 X Johns-Hopkins Univ. Circ, vii. (1888) pp. 36-7. 



