ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 751 



able changes during sexual maturity. The female organs consist of two 

 longitudinally folded saccular ovaries which extend tliroughout nearly 

 the whole length of the abdomen, and have a rather large cavity ; the 

 dorsal side of the ovaries has no ovarian follicles ; tlie second pair of 

 ovaries described by Blanchard could not be found. The walls of the 

 uterus are formed by a high glandular ei)ithelium and a highly developed 

 porous chitinized iutima ; at the sides are the openings of two receptacula 

 seminis ; near its hinder end tlie uterus forms two hollow, wing-like, 

 highly chitinized outgrowths, which serve for the attachment of the 

 muscles which are stretched vertically between the dorsal and ventral 

 wall. The male organs of imm iture individuals consist of two tubular 

 testes, which pass anteriorly into very narrow vasa deferentia ; these 

 open on the inner bide of two reservoirs, which, again, are each con- 

 nected by a short etferent duct with the anterior end of an unpaired 

 cavity (uterus masculinus) ; this last opens into the genital cavity. 

 This uterus has an unpaired blind sac on its upper wall and a seminal 

 vesicle on each side ; at its anterior end there is a circular chitinized 

 pad. In sexually mature animals the genital cavity alters somewhat, 

 nimierous folds appearing in its walls. The epithelium of the uterus 

 masculinus and its appendages becomes extraordinarily high, and the 

 chitinous investment much thicker ; on its lower wall a groove becomes 

 distinctly noticeable, which extends from the opening of the blind sac to 

 the hinder end of the uterus, wliere it diminishes remarkably in breadth. 

 The reservoirs become much larger and fill up the anterior part of the 

 abdomen, while the walls between them become absorbed and an unpaired 

 reservoir is formed. 



Transverse sections of sexually mature males reveal the presence of 

 tubular glands with very characteristic contents on the dorsal surface 

 oi the whole abdomen ; these glands open into the unpaired reservoir. 

 The contents consist of small, rounded corpuscles with a central nucleus, 

 of a homogeneous material which, in spirit-specimens, becomes converted 

 into a yellow, hard, chitin-like mass, and of another homogeneous mass, 

 which in spirit often breaks up into rounded corpuscles. This body is 

 partly formed by the ej)ithelial cells of the glands, which form two or 

 three layers ; the inner part of each cell breaks uj) into five or more 

 pieces, and the final result is the formation of at least sixteen cor- 

 puscles, each of which contains a nucleus, and may therefore be regarded 

 as a cell. "Whether the other contents of the gland and of the reservoir 

 are products of the further metamorjihosis of these cells cannot yet be 

 determined. 



In conclusion, the author discusses, with figures, the homologies of 

 the various parts of the generative apparatus in the two sexes. 



Lucifer-like Decapod Larva.* — Mr. G. Brook took in the tow-net 

 ofi" the West Coast of Scotland a peculiar Decapod larva, which seems to 

 be unlike any which has yet been described ; in general appearance it 

 IS very like semi-adult forms of Lucifer, the development of which has 

 been worked out by Brooks. It differs, however, in having five pairs of 

 pereiopods, while Lucifer has only three in the adult and four in the 

 embryo ; the telson is triangular in form, as in the normal Zoea of 

 Decapods; and the pereiopods and uropods are not developed till a 

 relatively much later period than in Lucifer. As it has an elongated 



* Pi-oc. R. Soc. Edinb., xv. (1887-8) pp. 420-3. 



