ZOOLOGY AND BOTANY, MICROSCOPY, ETC. G05 



independent, and not from modified appendages as was formerly 

 asserted, he indicates the origin of their ganglion from the distally 

 constricted portion of the dorsal cerebral lobe (the secondary cere- 

 brum). A detailed comparative account of the innervation and his- 

 tology of these lateral eyes is then given, with critical notices of the 

 opinions of Grenacher, Carriere, and others. 



VII T. The unpaired frontal eye is then described ; and in regard 

 to its function, it is noted that while the absence of a refracting 

 apparatus seems to exclude the possibility of the perception of 

 images, and points, therefore, to a diffuse sensitiveness to light, 

 the slight differentiation of the nerve-cells suggests the probability 

 that its function is restricted to a susceptibility to the heat-rays of 

 light. 



IX. Alimentary and excretory organs. — After some notes in regard 

 to the oral appendages, in the course of which the absence of a mandi- 

 bular palp is emphasized as a general character of the Phyllopods, 

 and a description of the alimentary tract, with a denial of the respira- 

 tory function of the hind-gut, Prof. Claus discusses at some length 

 the antennary and the shell-glands, as also the interesting segmental, 

 ventral, and limb " glands," and lastly the " Nackenschild." 



X. Heart, circulation and respiration. — In regard to the structure 

 and development of the primitive type of heart exhibited by Bran- 

 chipus, Professor Claus has little to add to his previously established 

 results. The same may be said as to the respiration ; as before, he 

 maintains, apart from the respiratory function of the whole of the 

 delicate integument, that the branchial sacks on the appendages are 

 special breathing organs. As noted above, he does not allow to the 

 intestinal surface that respiratory function with which it has been 

 repeatedly credited. 



XI. Reproductive organs. — The modification of genital segments 

 and external organs, and the structure of the male and female glands, 

 are finally discussed, and on the former point a further report is 

 promised. 



Of this detailed monograph of the much-investigated B ranch ipus, 

 which occupies a whole part of the Wien Arbeiten, little more than 

 a table of contents has been above given. The memoir is illustrated 

 with twelve plates. 



' Challenger ' Stomatopoda.* — Mr. W. K. Brooks gives a resume 

 of his report on this group published in the " Challenger " Eeports. 



Out of fifteen adult species eight are new, and two have been 

 only inadequately described. The pelagic larvae are numerous, and 

 have served to establish the connection between the adults and their 

 proper larva3 in all the genera except two. 



The development, however, is difficult to trace ; they undergo 

 secondary modifications which are not represented in the adult ; in 

 fact, the larvse differ more from one another than do the adults. 



From a comparative study of the larvas, it is possible, as with the 



* Johns-Hopkins Univ. Circ, v. (1886) pp. 83-5. 



