ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 307 



The number of pedal papilhc is often more than three, and may rise to 

 six (Peripatm ecuadorensis). There is a correlation between the number 

 of papillte and the number of appendages ; and tho forms with the 

 largest number are the more primitive. The abnormally situated 

 urinary papillae of the fourth and fifth appendages are regarded as 

 representing "the excretory pores of the sexual nephridia of the aquatic 

 ancestor of the group." Viviparity followed as an adaptation to terres- 

 trial life, and resulted in the displacement of the genital function to the 

 penultimate appendages, leaving the nephridia of the fourth and fifth to 

 reassume their urinary functions. After a long period of viviparity 

 there was a return to oviparity with very large eggs. 



5. Arachnoidea. 



Discoarachne brevipes Hoek.* — Leon J. Cole amplifies Hoek"s 

 description of this Pycnogonid from Sea Point, Cape Town, where a 

 female specimen was collected during the cruise of the ' Challenger.' Mr. 

 Cole received 11 specimens from iJr. W. F. Purcell, of the South African 

 Museum, — 6 females, 3 males, and 2 immature. He notes some secondary 

 adaptations on the ovigerous legs of the males to hold the egg-masses. 

 One of the males bore 8 closely crowded balls of eggs in the same stage 

 of development (the number 8 corresponding to the genital openings of 

 the female), and besides these another set of eggs mostly hatched. This 

 shows that the male had taken eggs from a second female while still 

 carrying eggs he had previously received from another. The " oviger- 

 ous " legs in the female are even larger than in the male, and Cole 

 suggests that they may help in the transfer of the eggs to the male. 



Hydrachnids of Central Russia, f — A. Croneberg gives a list of 

 the water-mites which he collected in the Gouvernement of Tambow, 

 thirty-three species in all, including Arrenurus Isevis sp. n., and Eylais 

 unisinuata sp. n. 



e. Crustacea. 



Notes on Fauna of Neuenburgersee. % — Dr. Th. Stingelin has 

 studied the littoral fauna at the south-west end of this lake, which he 

 found to include 20 Cladocera, 7 Copepods, and 3 Ostracods. He 

 devotes particular attention to two rare and bizarre forms — Alonafalcala 

 Sars and Monospilus dispar G. 0. Sars, the latter new to Switzerland. 

 He has also notes on the limnetic fauna of the north end of the same 

 lake. 



Annulata. 



Stolonial Growth in Syllidse.§— G. Pruvot has made some careful 

 measurements as to stolonial budding in various Syllids, and thinks the 

 following law may be stated. The rapidity and activity of the budding, 

 whether cephalogenic or urogenic, is in proportion to the relative size of 

 the area which exhibits it. The development of cephalic and caudal new 

 formations is thus in inverse ratio in the same animal. More generally, 

 he maintains that the activity of regenerative histogenesis (here and 



* Zool. Jahrb., xv. (1901) pp. 243-8 (1 pi.). 



t Bull. Soc. Imp. Nat. Moscow, 1902, pp. 90-101 (1 pi.). 



j Rev. Suisse Zool., ix. (1901) pp. 315-23 (1 pi.). 



§ Comptes Ecndus, exxxiv. (1902) pp. 433-6. 



