ZOOLOaY AND BOTANY, MICROSCOPY, ETC. 61 



the limbs) have the form of canals. The blood returned from the eyes 

 and antennse flows over the masticatory stomach and the hepatic sacs, 

 and is conveyed into the lateral portions of the carapace, whence 

 it is returned to the pericardial cavity. The blood from the thoracic 

 limbs traverses canal-like lacunsB, which project into the respiratory 

 cavity, and finally reach the pericardium. 



The circulatory system of the Decapoda was chiefly studied in 

 living examples of Fhyllosoma, Alima, &c., and other decapod larvae, 

 and detailed descriptions, copiously illustrated, of the disposition of 

 the blood-vessels in various species are given. In the young zooese of 

 the Macrura, and in the corresponding Megalopa stage of crabs, all the 

 chief arterial trunks of the adult were plainly distinguishable, and the 

 fact that the young larvae have not merely the characters of the 

 MysidsB only, but also (in so far as regards the circulatory system) 

 the characters of the higher Decapoda, appears to be an important piece 

 of evidence against regarding them as representing a primitive form 

 whence both have taken their origin. 



Enteric Glands in the Crustacea.* — J. Frenzel describes the 

 histological characters of the " liver " 'n Decapoda,f Isopoda, and 

 Amphipoda, and the nature of its secretion ; in all these Crustacea 

 the liver contains an abundance of fat in uncoloured or coloured 

 drops, which are either developed in special cells (Decapoda, Gam- 

 maridse, Caprellidae) or in the ordinary secretory cells (Isopoda 

 Phronimidse) . With the sole exception of the Isopoda, these cells 

 contain in addition small spherical bodies generally aggregated in 

 masses. The most important element in the secretion, however, con- 

 sists of a fine-coloured granular matter which is produced in special 

 cells (Decapoda, Gammaridae, Caprellidse), or in the same cell as the 

 fat-globules (Isopoda Phronimidse). The structure of these cells is 

 much the same in all Crustacea ; the secretion is apparently more 

 like that of the pancreas of Vertebrata. 



' Challenger ' Cirripedia. J — Dr. P. P. C. Hoek concludes his report 

 on the Cirripedia,§ by the present series of chapters on the anatomy 

 of the group. 



Unfortunately, the new forms of the deep-sea material being often 

 represented by single specimens, it was impossible to work out their 

 anatomy in any detail ; but some excellent work has been done on 

 forms formerly known. Thus the subject of the " complemental " 

 male of Scalpellum is treated of, and every justice is done to the 

 investigations of Darwin, who in 1851 first called attention to the 

 strange phenomenon. " When we consider how much the methods of 

 microscopical research have been improved in the thirty years which 

 have elapsed, and that the male of Scalpellum vulgare which Darwin 

 investigated is only • 7 mm, in size, we can only wonder at the 



* MT. Zool. Stat. Neapel, v. (1884) pp. 50-101 (1 pi.). 

 t See tMs Journal, iv. (1884) p. 375. 



X Report of the Voyage of H.M.S. ' Challenger '—Zoology, x. (1884) 47 pp. 

 (6 pis.). See Nature, xxxi. (1884) p. 165. 

 § See this Journal, iv. (1884) p. 890. 



