ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 737 



of two or more joints, and appears to have had the function of 

 producing a current of water among the branchiae. 



In the following table the author gives expression to his views 

 of the affinities of the Trilobites. Placing after the Crustacea and 

 before the Arachnida the class Pcecilopoda, he thus arranges the 

 latter : — 



Sub-class Merostomata. Sub-class Palceadce. 



Order Xiphosura. Order Trilohita. 



„ Eurypterida, 



A succeeding table gives the characters of the different orders. 

 As to the order Trilobita, he finds that, while it agrees with the 

 others in such points as the structure of the cephalic appendages, 

 it differs from them in the thoracico-abdominal regions having ap- 

 pendages to all the segments and the abdominal segments anchylosed, 

 but he is careful to point out that his work has been palseontological. 



A note on the ova of the Trilobite concludes the discussion of 

 this subject. In a critical note * " J. D. D." points out that if the 

 legs were so distinct as Mr. Walcott represents them " it seems to 

 be incomprehensible that such dissections should have been needed 

 for their discovery. A series of distinct ambulatory legs on a large 

 Trilobite should have been large and stout ; " and it is suggested 

 that the parts in question are " merely subdivided and thickened 

 portions of the outer ventral shell, which served as attachments for 

 thin membranous articulated appendages such as have hitherto been 

 attributed to Trilobites." 



Vermes. 



New Annelids from the North Sea.f— Herr G. A. Hansen 

 describes as new : Polynoe assimilis, P. spnnulosa, P. foraminifera, and 

 P. glaberrima ; PJiyllodoce arctica, Brada granulosa, Trophonia arctica, 

 T. borealis, T. rugosa. Fifty-five species altogether are catalogued in 

 this addition to our knowledge of the distribution of these forms ; 

 they were all collected during the Norwegian expedition of 1878. 



New Lumbricina.ij: — Dr. L. Oerley describes two new forms of 

 the genus Allolohophora — A. Fraissei and A. mediterranea — from the 

 Balearic Islands ; especial attention is directed to the accessory 

 organs of generation. It has been observed that in the adult the 

 " tubercula pubertatis " frequently (in A. Fraissei) fuse with the 

 clitellum and so become invisible ; in the other new species they 

 form delicate ridges on the twenty-eighth, twenty-ninth, and thirtieth 

 rings. No copulatory papillae were detected in A. mediterranea, and 

 in the other species the author noticed that the setae which Eay 

 Lankester and Fraisse have regarded as accessory copulatory organs 

 were not remarkably larger than the rest of the setse. Lumbricus 

 terrestris, Enterion rubellum, Allolobopliora foetida, A. mucosa, and 



* Amer. Journ. Sci., xxii. (1881) p. 79. 



t Nyt Mag. f. Naturvid., xxv. (1880) pp. 224-34 (5 pis.). 



X Zool. Anzeig., iv. (1881) pp. 284-7. 



