REPORT ON THE AMPHIPODA. 495 



Rougemont)." He has uniformly found tliis in company with Gammarus pideaims, 

 which, according to Rougemont, is its mortal foe. He agrees with Rougemont in con- 

 sidering that AseUus camticns is related to Asellus aquaticus very much as Gammarus 

 puieanus is to Gammanis piilex. 

 At p. 309 other localities are mentioned for the occurrence of Gammarus puteanus and AseUus 

 cauaticus. 



1879. Grenacher, H. 



Untersuchungen liber das Sehorgau der Artliropoden, insbesondere der Spinnen, 

 Insecteu und Crustaceen. Gottingen. 1879. 



Preliminary notices of these investigations were given in the Gottinger Nach- 

 richten, 1874, Nr. 26, and in the Klinischen Monatsblatter fiir AugenheHkunde, 

 supplementary number for May, 15th year, 1877. 



The elaborate and exquisite illustrations to this work seem to show all that is at present 

 known as to the organs with which the book is concerned. Greuacher maintains " the 

 theory of Mosaic Vision," propounded by Johannes Midler in 1826, and gives references to 

 numerous works more or less opposed to or agreeing with his own views. In pages 109-114, 

 and on Plates IX. and X., he treats of the eyes of the Amphipoda, referring especially to 

 Gammarus locusta, Talitrvs saltator, Gammarus iiegledus, Hyperia galha, Phronima 

 sedentaria. Fig. 99 gives a " Schnitt, parallel der Liingsase des Thieres und senkrecht auf 

 die Langsaxe der Gesammtauges, von Gammarus locusta." Pig. 100 shows a single ocellus 

 from the same animal with the " nuclei of Semper " on the surface over the crystalline cone, 

 composed as usual of two longitudinal segments. Fig. 102, A. and B., shows two 

 ocelli of Talitrus locusta, one from the middle, the other from the rim of the eye. 

 Fig. 103 shows the " ZeUkerne der Retinula" on either side of the inner end of the 

 crystalline cone of one of these ocelli. Fig. 104 shows the " Krystalkegel mit Retinula 

 aus dem Auge von Hyperia galba (H. Latreillei). Der Krystalkegel aus dem peri- 

 pherischen Theileu des Auges ist von einer weiten Hiille umgeben, deren Kerne vorn 

 gelegen sind. Besondere Zellen, um das Hinterende des Krystalkegels. Das fein quer- 

 gestreifte Rhabdom hat iu seinem Innern eiuen deutlichen Canal." Fig. 105, a.b., is a 

 " Querschnitte durch den Krystalkegel desselben Thieres in verschiedene HiJhen, um das 

 Verhalten desselben zu seiner Hiille zu zeigen." Fig. 106, a.b.c, shows "Querschnitte 

 durch die Retinula desselben Thieres in drei verschiedenen Gegenden. An alien ist die 

 Zusammensetzung der Retinula aus fiinf Zellen, an den beiden ersteren auch die des 

 Rhabdoms aus ebensoviel Stabchen, sowie der centrale Canal desselben zu erkennen." 



1879. HOEK, P. P. C. 



Carcinologisches, grosstentheils gearbeitet in der zoologischen Station der 



niederlandischen zoologischen Gesellschaft. Tijdschrift der Nederland. Dierkund. 



Vereeniging. DeellV. 1879. pp. 97-lGl. Mit Taf. V.-X. 



t 



The work contains five chapters : — 



I. On the anatomy and classification of the CapreUidae. 



II. Contributions to the knowledge of the Corophidae. Dr. Hoek here goes into detail to 



confirm the opinion of A. M. Korman that "Coropldwn Bonellii," Bate and Westwood, is the 

 female of Corophium crassicorne, Bruzelius. He unites, in agreement with Axel Boeck, 



