ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 531 



vesicular structure, but within each vesicle lies a granulated body, 

 attached to the wall of the vesicle by radiating bauds. The whole of 

 the cytoplasm displays this remarkable structure, aud the chromosomes 

 of the nucleus similarly consist of rows of these peculiar vesicles. 



New Entozoic Copepod.* — Miss A. L. Embleton has found within 

 the rectum of a Japanese EcMurus (E. unicinctus), a copepod to which 

 she gives the name of Goidelia japonica g. et sp. n. ; it occurred in 

 association with a Protozoou parasite, probably a new species of Tricho- 

 dhia. The copepod belongs to the family Clausidiidse Auct. (Hersiliidoe 

 Canu), but differs from the members of the known genera in that the 

 male and the female very closely resemble one another, and the male is 

 not attached to the female. The new form is without eyes; the first 

 antennae have only five segments; the second antenna terminate in a. 

 powerful hooking apparatus ; the mandibles are without accessory parts, 

 and are very small and claw-like ; the first maxillipede is degenerate in 

 the male and the second in the female, while in the male the second 

 maxillipede is powerful and chelate ; the thoracic legs are all similar, 

 and are without sucking discs. The associated protozoon was not 

 sufficiently well-preserved for much of its structure to be made out. 



Development of Leptodora hyalina.f — Dr. E.Warren publishes a 

 preliminary account of the development of the nauplius of this primi- 

 tive daphnid, the material having been obtained from Lake Bassenthwaite. 

 The special object of the investigation was to determine whether a . 

 ccelom does or does not occur in the embryo, but the specimens obtained 

 were all free-swimming with well-developed muscles, so that the question 

 could not be decided. The antennary and maxillary glands seem both 

 to be purely ectodermal in origin, the end-sac being merely a terminal 

 dilation of the glandular tube, and not mesodermic in origin. No trace 

 of ccelom sacs was observed. 



Swedish Cladocera.J — Prof. "vV. Lilljeborg deserves to be warmly 

 congratulated on the publication of this great monograph on the Clado- 

 cera of Sweden, which has been his ambition since he began to work 

 at the subject in 1853. 



Annulata. 



Origin of Annelid Mesoderm.§— E. Meyer re-publishes in German 

 his elaborate paper on the development of Annelids which first appeared 

 in Russian in 1898. The work, which is a continuation of the author's 

 previous researches on the structure of the Annelid body, has a mucii 

 wider range than is indicated in the above title, and the general con- 

 clusions only can be indicated here. A detailed study of the develop- 

 ment of a series of Annelid larvse has led him to distinguish between 

 two different categories of mesoderm structures, the embryonic mesen- 

 chyme and the " coelothelium," and also between two body-cavities, the 

 primary and the secondary. The embryonic mesenchyme is not -,i 

 morphological entity, but consists of a collection of tissues, containing 



* Journ. Linn. Soc. (Zool.), xxviii. (1901) pp. 211-29 (2 pis.). 



t Proc. Boy. Soc. lxviii. (1901) pp. 210-8 (6 tigs.). 



J Nova Acta E. Roc. Soi. Ijpeal, xix. (1901) vi. and 701 pp. and 7 pis. 



§ MT. Zool. Stat. Neapel, xiv. (1901) pp. 247-585 (6 pis.). 



