ZQOLOGY AND BOTANY, .MICROSCOPY, ] 39 



Subradular Nervous System of Solenogastres.* — Harold Heath 

 calls attention to the interest of the nervous system of Chcctoclerma and 

 related forms. It is very conservative, retaining many ancestral 

 features, indicating relationships otherwise most obscure. One of the 

 enigmatical points is the so-called buccal or stomatogastric system, 

 consisting of a connective arising from the brain on each side, and 

 passing backward to a ganglion imbedded in the pharyngeal musculature. 

 The ganglia in turn are united by a commissure passing beneath the gut 

 in the neighbourhood of the radula or the outlets of the ventral Balivary 

 glands. Heath shows that in the genus Ghmtodennu what are usually 

 termed the buccal ganglia and their connectives are in reality labio- 

 buccal, giving rise, as in the Neomeniidre, to subradular connectives and 

 ganglia.' The small ganglia inserted between the larger labio-buccal 

 masses apparently originate no nerves, and are accordingly not to be 

 definitely homologised. 



Antarctic Solenogaster.f — H. F. Nierstrasz describes the single 

 Solenogaster in the ' Discovery : collection, giving it the name Proneo- 

 menia discoveryi, and pointing out the distinctiveness of the species of 

 this genus. He also takes a survey of the family Proneomeniida\ 



Bathysciadium, Lepetella, and Addisonia. —J. Thiele gives some 

 account of these imperfectly known forms, which he refers to the 

 Cocculinoidea, the first two genera being included in a family Lepetel- 

 lidse, while Addisonia, which is much further from the Gocculina type, 

 requires a special family for itself. 



8. Lamellibranchiata. 



Classification of Lamellibranchs.§— Mario Stenta discusses this 

 problem. He first considers the relative values of the various organs 

 for taxonomic purposes. He then states and criticises the arrangements 

 proposed by Neumayr, Fischer, Pelseneer, Menegaux, Dall, Jackson, 

 I : robben, Bernard, Ptlce, Ridewood, Lankester, and others. The classifi- 

 cation which seems to the author to be most real is that of Grobben :. 

 Protobranchiata (Nuculidae, Solenomyidae) ; Eutaxodonta (Arcidae) ; 

 Heterodonta (a large sub-order); and Anisomyaria (Avicuhdse, Myti- 

 lidoB, Pectinidse, and Ostreidse). 



Arthropoda. 

 c Insecta. 



Regeneration of Wing in Lepidoptera.||— J. Meisenheimer has 

 succeeded in removing a wing-prhnordium from caterpillars of Ocneria 

 dispar, and has found that the imago has the corresponding wing 

 developed on a reduced scale. Werber and Kammerer have observed 

 the replacement of a wing in the sexually mature imagines of lenebrw 

 and Musca, but there is nothing of this s« »rt in Lepidoptera. 1 he author 



* Anat. Anzcig., xxxiii. (1008) pp. 365-7 (1 fig.) 



+ Nat. Antarctic Exped. (Zool.) iv. (1903) 13 pp. (2 pis.). 



t Bull. Mus. Comp. Zool. Harvard, lii. (1908) pp. 81-9 (2 i 



§ Boll. Soc. Adr. Sci. Nat. Trieste, xxv. (1908) pp. 1 



' Zool. Anzeig., xxxiii. (1908) pp. 689 98 (1 pi. and 2 fig*.). 



